question regarding fesh air blower on '72 911

kretzj · 08-03-2002, 12:47 PM

I have been restoring a car since I purchased it 6 years ago and I am finally putting it back together. When I turn on the fresh air blower, it works on setting I and II but not III. Is there an adjustment or is the motor crapping out at that setting?

Thanks,

Jon

jkeyzer · jkeyzer's Garage

You can check the voltages at the fan connector (using a wiring diagram as a guide) to make sure the fan is getting power for all three settings. The fan control in the dash in very cheesy in that it uses a sliding arm on exposed contacts to turn on the different fan speeds. I had to take the switch console out and clean the contacts with fine sandpaper and contact cleaner to get it to work right.

pwd72s · 08-03-2002, 02:23 PM

Spray contact cleaner alone worked for me...guess I was lucky?

kretzj · 08-03-2002, 05:37 PM

Is there an easy way of getting the slide mechanism out?

Jon

pwd72s · 08-03-2002, 06:31 PM

With the spray contact cleaner, I didn't have to pull a thing. Just sprayed it in, moved the knobs back & forth a few times. That's what I meant about being lucky...

kretzj · 08-05-2002, 10:38 AM

I finally figured out what the problem was. When you slide the lever over to III, the electrical contact moves over a plastic ridge that separates position II and III. All I had to do was bend the contact.

New question: I have a light connection to the blue lens but no light connection to the red. The wiring does not look like it was modified or hacked. What are the color codes to the red lensed light and does anyone know where I could get a used light connection?

Jon

pwd72s · 08-05-2002, 03:48 PM

Don't ask me why, but there is no red light in the red section of my car either...my guess, pure guess, is that it was designed to be used on cars with auxiliary (gas) heaters? Anybody have an answer to this?