Originally my blower motor only worked on high speed which leads me to believe the resistors are bad. Anyone know where these are located on an '88 GTA?

Now my blower motor will not work at all. I connected it straight to the battery and the motor works. I hear what sounds to be the relay when I turn it on and off. Also, I get 12V across the leads to the motor when turned on. But still no motor. I also swapped the climate controls with another known good switch, still nothing. Any ideas?????

Thanks,
J

 

Sounds like it could be a couple of things. When it used to work only on high, tells me that the resistors were bad, or not hooked up. There should be a plug with 5 or so (2 purple, tan, lt. blue, yellow) wires in it that plug into the top of the Heater box, just to the right of the blower motor (if you are looking at the blower motor from the front of the car). Check the connections and/or pull the resistors out of the heater box and inspect them. Its just two screws that hold them in, and all the "resistors" are, are just three little metal coils. See if they are broke or fouled up.

Now you say that the blower motor dosent work on the high setting now, but it works with 12 volts applied from the Batt. That says that the ground is good, so the only thing I can think of is the Fuse Link that goes to the starter. When the blower motor is switched to high, it draws its power dirrectly from the Batt. via the starter. Maybe your fuse link got kinked and broke, or it burnt up, who knows. Check the continuity on the wire, this would be the big red wire that comes from the relay which should be mounted right by the plug mentioned above.

Hope this helps. I know I didnt cover everything, but maybe this can get you started. Feel free to ask more questions. Let us know. Let me see if I can scan some diagrams.

 

when i had the 84 Z28, it had no blower operation, it ended up being that the ground wire(the black one running to a screw that holds motor to the heater box, sometimes one of these blower screws holds a small metal tab/spade style connector for the wire to plug to) didnt have any ground in it for some unknown reason, so i ran a new one to a fender screw for it near the battery area

 

This is why I am completely baffled. If I turn the blower switch on high and check the voltage across the hot and the ground connected to the blower motor it reads precisely 12V. But it doesn't run. When I first got the car it worked on high but sometimes I had to switch it on and off a few times to get it to work.

 

Sounds like the motor has met it's maker.
You seem to have a voltmemter so, while unplugging the power wire (purple) to the motor, stick your voltmemter probe in that plug (or at the resistor) and ground the other. Turn the car on and observe the voltage with different fan speeds. If your seeing the voltage change (higher voltage according with fan speed), then you know everything is checking out and the blower motor is cashed.

 

That's the part I can't figure out. The original motor works fine when connected directly to the battery. The brand new motor I put in also works perfectly when connected directly to the battery. 12V but no motor action. I will have to try grounding it somewhere else and see what happens.

 

I haven't run across this to often, but... It may be the Controls itself. I have come across this before , just no often. Maybe you could pick one up for real cheap at a wreckers,. It may save you from chasing wires and stuff. Just a thought.

 

Yep, already tried it out of desperation. I swapped the controls out with another known good unit and still the same result. The switch definitely works because when it's off I read no voltage. When it's full on I see 12V.

 

Hmmm tuff one! Well the only thing it seems to be is either a loose ground or power wire. Sounds more like the ground though. I hope you figure it out. Wiring can be suck a PITA. I didn't notice though. Did you change the resistor anyway??? I would try that even though everything else you have found leads to that not being the problem, I would still try it. They aren't exspensive either, so....