I was driveing home and had my heater on. I pull in the garage and turned the fan on high by accident and then off. I guess i didn't notice but the fan didn't shut down and was still running when I go to turn the car off and I shut it down.

With no key now in the ignition the heater fan is still running on high. I play around with the heater and fan controls and it doesn't do anything. I turned the car back on to see if that would help but it didn't. The fan wont even turn to a lower speed. I tried pulling the fuse that says heater a/c but the fan still runs. So I had to pull the (-) battery cable.
What should I do???

 

Hey.

Does the fan switch feel different from how it felt before the problem surfaced? I would try pulling it out from the panel and looking for any connection issues (perhaps a frayed control wire). In the past I had the A/C remain on in the Formula and the issue disappeared when I rebuilt the non-electric (vacuum) portion. That is more anecdotal than explanatory in nature, but it suggests that there are many possible causes lurking behind the panel.

Alternatively, you could trace the wiring from the switch to the blower motor (or from the motor to the switch if you have been working in the engine compartment lately) and see if there is any exposed wire which could be shorting the circuit into a "power-on" state.

I wish I could explain why pulling the fuse did not work. In all seriousness, it may be possible you pulled the wrong fuse. We have probably all done that once or twice. In any case, please post what happens.

HTH, peace

K

 

A really dumb thing to check ... you diodes in the alt are gone. disconnect the BAT terminal on the alt and see what happens.

My wife's 83 camaro did that. If the fan switch was in the fast or off (don't recall) it would run when the car was off! I checked everything and it turned out to be the alternator. When the key was off, it allowed power to return down the feed wire or something and power the circuit.

Unplug the alt, and disconnect the BAT terminal on it and see if the heater stops.

Mark.

 

I traced alot of the wireing and it seemed fine. Someone on another board said its the blower relay stuck closed so I took it off and Ill pick one up tomorrow and hopefully thats all it is.

 

There isn't any blower relay. Just your dash switch and the resistors that are located in the heater air box.

I know my solution seems very odd. With your key off, there is no power going to the heater circuit, but if power is allowed to come back through the alt, you can get power through the ground side.

If all else fails, try my idea. Maybe it will save you some time.

MArk.

 

I think there is a blower relay. Its right next to the blower and when I pulled it the the blower stopped running. Also I was looking around and partsamerica.com has a blower relay listed for my car. Ill try your idea hopefully that will help. Thanks.

 

Your car has a high blow relay powered with 12 volts at all times. When high blow request is asked for it uses the realy to carry the load because the switch or resistor block couldn't on high speed. Yes it has a high blow relay, and yes you found it.. Replace it and your ok...

 

There is a blower high speed relay.