Topic: blower resistor?

[GrenadedToy]

the heat in my 85 doesnt blow good at all, its really weak even when its turned on hi.(this is after is is fully warmed up,too) i was thinking it might be the blower resistor that is out. is there anything else it could be?

[No Power]

My heat would not blow out very hard and it ended up being the fan speed control switch and was not very hard to replace. Just my 
Hope this helps

[BUDDERS]

Blower motor resistor is the most typical issue.  Usually if it is bad, then the blower motor will only work on high speed though.  Depending on how old your truck is, you may have an issue of a clogged up heater core or just a bunch of craaaap stuck in the fins from rats or something.

[BigMike]

Yup, what year is your truck?

I think blower fan resistors were only used on 3rd gen and newer (1990+).

I know for sure that 1st gens do not have resistors, and Bevins '85 also does not have one.

Also, a simple way to check if your heater core is plugged or not, is after your engine has warmed up, move your climate lever to full hot, and with the engine idling, open the hood and compare the temperature of the two heater core hoses that are located above the back of the cylinder head, and plug into the firewall. The two hoses will be about 200 degrees, and should both be nearly the same temperature, plus or minus like 5 degrees...

Mike

[lowgeared]

All my 85's appear to have a set of resistors that are cooled by the airstream.  They are located right behind the blower motor.  When unplugged my blower only blows on high.

[BigMike]

All my 85's appear to have a set of resistors that are cooled by the airstream. They are located right behind the blower motor. When unplugged my blower only blows on high.

WOAH, could you take of picture of them for me PLEASE??

Actually, after we finished Bevins 3RZ conversion, his blower fan only works on High. So of course I figured I had left the resistors unplugged since I had removed the entire dash, so I looked and looked and looked for them, but could not find any thing unplugged. Also, I have looked at 3 different wiring diags, and I can not find anything talking about resistors.

And on my '81 truck, a couple of months ago, my Low position quit working. It works on Medium and high, but not on low. So I also looked at the wiring diags, and they do not list a resistor for the first gen.. So I just figured it was in the switch. I have not replaced it yet though...

Bevin's truck is an '85 with factory AC. It would be GREAT if it was as simple as something being unplugged.

You know, my 1987 MR2 has resistors and I have replaced them once, so I really figured that the 2nd gen trucks would have resistors too..
Seriously, if you could take a picture, even if its with a cell phone camera, It would be MUCH appriciated!!

[kneedownnate]

And on my '81 truck, a couple of months ago, my Low position quit working. It works on Medium and high, but not on low.

Mike, on my 80 low never worked, so I switched it out with a switch out of my 81 so I knew it worked, and it still doesn't work.  I've never gone further into it cause I have an a/c setup I was gonna put in it, but that's still never been done yet.

[lowgeared]

They are right behind the blower motor.  I actally broke it when I pulled the blower motor out.  The only reason I even fiddled with it is because I stuck a different one in there from a different truck.  In my Chiltons page 6-10 Fig 32 "Typical heater unit-pick up model" part number 3 shows a heater blower resistor and its location.

[kyle_22r]

i'm sure at least the '84-88 trucks have a resistor, roger brown has a writeup on it on his site.

i'm also fairly certain my '79 has one as well -- i'll have to take a look at the fold-out wiring diagram in my FSM to make sure

[derek]

yup my 81 has one,its right next to the blower motor. had to replace it once.
wish they made an after market one.
i wonder if you can replace the wire when it breaks by soldering in resistors?

derek

[BUDDERS]

I don't see why not, but it would be helpfull to know what impedence resistors to use before the wire breaks.  If you got a good one in another truck try measuring accross it's resistors with an ohm meter.  Then you will know which one to buy at radio shack.

[RHG]

Soooooo, my lowest setting doesnt work. That means its a resistor for the blower motor? I've got a third gen pickup. Kinda annoying cause first setting doesnt work and the second at times is too hot.

[BUDDERS]

Yup, that's usually what it means.  Now if your #2 coil in the blower motor resistor blows, you will only have a high setting.  You might want to check it now befor this happens.  Look for the plug down by the blower motor that attaches to another black thingy that is screwed into the air duct right by the blower motor.  If you unscrew it and pull it out, you should be able to see the blown resistor.  They are just a few air cooled coils and thats really about it. Good luck

[BigMike]

Ummmmm ......... I am not doubting anyone, but its just that I can not find the little bugger


So if anyone has their interior apart, or has a parts rig, could I get a picture of it Exactly?

I need a picture of it for Bevins truck, which is a 2nd gen interior, and I need a picture of one for my truck, a 1st gen.

That would be sweet, thanks dudes
Mike

[toynorcal]

try this link Mike.

http://www.4crawler.com/4x4/CheapTricks/Blower.shtml#BlowerResistor