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hey guys chrisfix here today I'm going
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to show you how to replace a blower
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motor resistor if your fan doesn't work
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on certain speeds such as a low speed
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like in my case or two speeds are the
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same or if the only fan speed that's
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working is the highest speed you
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probably have a bad blower motor
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resistor so this is a blower motor
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resistor and what this does it looks
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complicated but all it does is use those
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coils to restrict electricity so when
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you have it on the lowest setting it
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restricts it the most so the fan doesn't
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blow as fast and then as you move up the
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higher you go up the more electricity
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that this resistor allows to flow
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through the problem is when you have it
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on the lowest setting you're restricting
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the most amount of electricity so that
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electricity has to go somewhere and it
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creates heat and this heats up a lot so
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a lot of times these things just fry
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they overheat they melt the connectors
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melt so that's what a blower motor
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resistor is and this is actually really
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easy to replace
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now these blower motor resistors are
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right next to the blower motor and the
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blower motor is commonly found either
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underneath the dash here on the
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passenger side sometimes you could open
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up your glove box and pull out the glove
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box and it'll be behind there or you go
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underneath and you just take out a few
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screws and a piece of plastic will come
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down and your blower motor will be right
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and the other location that the blower
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motor could be is in the engine
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you can see here I'm going to the
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passenger side of the engine compartment
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and this is what a blower motor looks
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like the blower motor is typically this
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round shape and then here's the actual
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motor and it's just a fan in there that
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spins around and sucks air from the
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outside of your car into the inside of
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your car so whether this blower motor is
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inside the vehicle or outside the
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vehicle in the engine compartment the
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blower motor resistor this thing is
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going to be right near it it actually
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uses the wind that's generated by the
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fan to cool it so what we're looking for
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is something that looks like this and on
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this it's actually right below here so
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if I lift this up you can see it right
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down there it has an electrical pigtail
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and then a bolt there and a bolt there
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that connects it so here are all the
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tools and parts you're going to need to
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do this job it's very simple just need a
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ratchet with in this case it's a eight
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millimeter socket I have an extension
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and if you're placing just a blower
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motor resistor that's all you're going
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to need but in my case I'm pretty sure
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you're gonna have to replace the pigtail
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because the pigtail looks like it's
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either fried or it's corroded
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onto the back of the current blower
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motor resistor so since it's like welded
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on it's probably shorted as well or it's
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just not going to come off so I'm
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planning on replacing it and in that
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case you just need a wire stripper black
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tape some connectors and then this came
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in the kit with the blower motor
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resistor so let's begin so as I pointed
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out the blower motor resistor is right
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next to the blower motor so what I'm
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gonna do is I'm gonna make it easier for
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me to get my hands down there I'm gonna
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take off this pigtail goes to the air
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conditioning system here all you gotta
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do you just pull this tab back and then
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slide this out and we'll just put that
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to the side also we could remove the
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blower motor cooling duct here it just
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provides air into the blower motor fan
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so it doesn't overheat just pull that
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out and then we could slide it down with
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those two things out of the way you
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could easily see where our blower motor
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resistor is and we get our hands down
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there really easily I'm gonna try to
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unclip mine but I'm pretty sure it's
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either welded from the corrosion or from
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melting plastic so here's the blower
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motor clip just to show you what the
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clip looks like there's two clips that
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need to be peeled backwards in order to
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pull this out one on the top one on the
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bottom this top clip should slide a
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little bit when I pull on this before I
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can lift it and it's not indicating that
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this is actually welded in here so what
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I'm gonna do now is I'm just gonna
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unscrew those two bolts they're eight
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millimeters and we're gonna take out the
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whole blower motor resistor with the
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pigtails still on it
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so you can see the two bolts that we
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need to get off I'm using an 8
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millimeter with a short extension
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we'll get this side first okay we got
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one bolt out now we're gonna go in here
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get our other bolt out got the second
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bolt out and now that both bolts are out
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this will just come right out upon
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visual inspection you can see there's
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rust so I'm sure this is shot you could
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also kind of see in that hole right
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there it's rusty that's where the
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pigtail connects I'm gonna try to get
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the pigtail off now and see if it's
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really rust welded on or plastic welded
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on or whatever
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okay well I tried a couple of times I
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used a flathead screwdriver to really
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get under there and this isn't coming
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off so we're just gonna cut it off and
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since we have all those wires removed
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from the wiring harness this will come
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now one thing while looking at this
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wiring harness that I noticed right away
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if you look it looks like this has
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actually been done before
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somebody replaced this this is a common
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problem on these four words and Mazdas
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and also many vehicles I don't know why
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they can't design something better so if
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you still have the complete factory
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wiring your factory wiring is actually
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colored so what you want to do when you
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cut this you don't want to cut it right
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against the side of the plastic here you
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want to give yourself some space because
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then you'll be able to see which color
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wire goes where and you won't get the
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wiring mixed up so whenever you're gonna
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cut wires or mess around with the
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electrical system it's always a good
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idea to keep everything off keep the key
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out of the ignition take the negative
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battery terminal off before you start
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cutting away so now that we got our old
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blower motor resistor out let's get our
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new blower motor resistor and install it
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before I install it one of the biggest
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problems is water getting in here it's
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in the engine bay when I go off-roading
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water does get up in there even if
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you're just driving around in the rain
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water to get up in there so what I have
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is some dielectric grease if you want
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you can use a q-tip to get some grease
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in here so pretty much what I just did
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is I just coated the whole outside of
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the plastic so when you slide that clip
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in it seals it really good in my truck
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when we're putting this in it fits in
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this way it'll only fit in one way so if
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you have it upside down you just have to
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twist it and get it in the right way now
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I'll just get two bolts in here to hold
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it in place just hand tighten it for now
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now we'll go in here and tighten these
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up we'll tighten up the other side as
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well and you shouldn't go crazy
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tightening these two bolts down just
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make them snug good so now we got the
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new blower motor resistor in there if
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that's all you need your job is done
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connect the pigtail and you're good to
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in my case my pigtail is melted or
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corroded so we need to strip these wires
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and put the new pigtail on I'll show you
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how to do that real quickly so with our
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wiring harness all spread apart like
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this I'm going to cut the aftermarket
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wires right at their connectors
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the aftermarket wiring harness has a lot
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of extra wire on it which is good but I
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don't need it at all so I'm just gonna
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take this kind of push it back down to
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place make sure the connector reaches no
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problem and it reaches no problem right
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so I'm gonna cut off this right here
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good now the kit comes supplied with
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four of these connectors there crimp-on
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connectors and with these crimp-on
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connectors what you want to do is you
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want to get each side of the wire to
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that middle piece so you can see that
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little mark on my wire that's about how
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much you want to strip to so that you
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have a good connection this is 10 gauge
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wiring I'm gonna show you one and I'll
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do the rest it's all the same all you do
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is you get your 10 gauge on your wire
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cutters right here and you go to that
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mark you made and you close down on the
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wire and then you twist the wire cutter
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around the wire after you twist it
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around a couple times then you just pull
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the wire and then you have a stripped
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wire so I'm going to do the rest of
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these and then I'm going to strip the
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connectors on the wiring harness side so
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I got both wiring harnesses stripped and
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ready to go so now we'll connect them so
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when we're looking at the pigtail here
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this curled rounded piece that the clip
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down here is on the bottom so when we're
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making our connection you can see the
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orientation that this is in this wire
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here is gonna be the green wire the next
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wire is gonna be the black wire the top
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wire here is gonna be the orange wire
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and the bottom wire here is gonna be a
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yellow wire so the same thing goes for
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our new connector green black top is
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orange bottom is yellow first thing
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we're gonna do is put the connector on
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the wiring harness down here so you get
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your green wire and you just twist the
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end twisting the end is going to make it
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a lot easier to slide it in here so just
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get your crimp connector slide it all
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the way in the wire should go to all the
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way to the base of that crimp connector
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here the metal part of the crimp
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connector and when you push the wire all
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the way in you just get the end of your
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wire strippers it has like a piece here
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for crimping you put it on the one side
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and you just crimp down
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you test it by just pulling on it and
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you see that that's not coming out now
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we get our wire which attaches to the
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green wire which is this one right at
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the end here what's the end slide it in
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make sure it goes all the way in and
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then crimp it down
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test it and it's good and now we'll tape
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this up good so now it's nice and secure
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and it's nice and tidy we're going to
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repeat this step for all of them now all
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four wires from the wiring harness are
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connected I'm going to just put them
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together like this and then wrap some
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black tape around it make it nice and
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now we have a nice neat bundle the
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wiring harness is all taped up looks
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good let's connect it and try it out so
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now we'll connect the wiring harness to
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the blower motor resistor make sure you
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push it in all the way remember that we
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have this red connector that we
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disconnected up here that gets pushed in
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until you hear it click now we're gonna
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take our excess wiring harness and just
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tuck it in under here
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remember we disconnected this so just
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string this back around there's a hole
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right here that this fits into so just
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make sure that that is completely fit in
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there there's this little stub here that
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gets pushed in underneath here and then
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this opening here connects to the
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opening down there so all our
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attachments are connected we reconnected
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this wire here we put this blower motor
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cooler duct on we connected our blower
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motor resistor our wiring harness is
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tucked in and away it's not rubbing
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against anything not near anything hot
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okay let's try it out remember to
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connect your negative battery terminal
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we'll go start up the truck
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the moment of truth we'll put the fan on
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the top there we go air is coming out on
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the lowest setting that's awesome
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let's just check the other settings just
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to be sure air is coming out on that
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setting good air is even higher on that
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setting and then obviously the full
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blast work to start with but now each
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fan setting works properly the way it's
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supposed to so that's a job well done
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hopefully this video was helpful if it
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