Mike 944

Hi,
I have an 84 944, and when I put my heater at the highest position, it shuts off. All other positions work perfectly, but just the high one never does.

I have my radio out....what's next?
What should I check for?
I also removed the cover for the blower motor in case I need to check for something there.

Any suggestion appreciated!
Thanks

Waterguy

The problem is not in your blower motor, it is in the wiring to the blower fan switch. You have the opposite problem than most people. Most people have problems with the selector switch or the ballast resistor, and their blower only works on "4".

Power goes from a relay to your blower motor, then goes to ground through your ballast resistor and selector switch. The brown wire from your blower motor comes under the dash through a two-wire connector. It then splits; the heavy (2.5 sq. mm) brown wire goes to the ballast resistor, while a second heavy brown and red wire goes to position "4" on your selector switch.

When the selector switch is on "4" this wire should go directly to ground (no resistance.) Test this. Since your blower doesn't work on "4", it probably does not. Possible problems are a break in the brown/red wire, bad connections at either end of the wire, or a problem with the contacts on the selector switch itself.

Good luck! Lets us know what you find. <img border="0" alt="[cheers]" title="" src="graemlins/beerchug.gif" />

Mike 944

Pardon my ignorance but what is a ballast resistor, and where is it?

Thanks a lot for the info....very useful. I'll try getting it sorted out this weekend.