No Heat

[NorCal930]

Well I am looking for some suggestions on what I might check first when trying to get my heater to work. I have a 1986 930 and when I turn the heat on using the dial on the center console nothing happens. It does not matter if it is on 1 or all the way up and I have tried this after the car is warmed up. It just seems to be dead. Thanks, Brent

[Les Paul]

http://members.rennlist.com/imcarthur/911autoheat.htm
that should explain some things for you

[mark '87 930]

If you have your ear to the dial after you turn it, do you hear the servo motor turning inside where the dial is?

[NorCal930]

Thanks for the Link Les Paul!

Mark I will have to try it but no fans come on all.

[mark '87 930]

I had the same problem last year.. but I heard the servo motor turning (takes about 20 secs to turn all the way). I then started troubleshooting with the help of some members on this board, and it turned out to be the microswitch inside the assembly. I replaced that and my fans (footwell blowers) came on right away.. and voila.. toasty toes!

Question for '86 911 Turbo owners: footwell fan operation

[NorCal930]

Ok Mark I put my ear to the heater knob and I could hear the little motor turning inside. So do you suggest I pull the control knob box and then the micro switch? I looked back at the posts, did you ever put in a new switch or just go with re-wiring the old switch as mentioned?

Thanks for your help.

Brent

[mark '87 930]

I ended up putting in a new switch as my switched failed outright after a few months of it being rewired (I guess it was on it's last legs). The switch itself is about $0.10!!! They are called Snap action switches, and the part number is on the actual switch. You being in the US, you most likely have better access to these things than I did. It took me a few weeks to find a source in Canada that had them locally (i can't remember the P/N but if you want I can find it).

In the thread I posted, there is a section I followed that helped me troubleshoot to that level of the switch. These things fail rather frequently, so if you pull off your center console heater unit, you can check it right away. While it is apart, check the continuity of the switch pinouts with the switch activated and deactivated.. that should tell you right away if it is good or not.

Be careful when you remove the console, you must disconnect the temp. sensors inside, as well as the arm with ball sockets on the ends (one ties to teh servo motor, and the other to the actuator whch opens/closes the heater boxes). Take your time... once you get used to it, you can probably do this in 20 mins or so.

[NorCal930]

Mark-

Thanks very much for your help and I will let you know how it goes. Hopefully, I will have time to take a look at it this weekend. If you find the part number it would be great but if not it should not be a big deal. I have a local Porsche garage I can probably go to for the part.

Thanks again,

Brent

[mark '87 930]

I will look into it tonight and report back.

I doubt that Porsche will give you that part seperately, they'll quote you the whole assembly.. and I don't want to know how much that will cost you!

[mark '87 930]

The switch is made by Crouzet (www.crouzet-usa.com).

The switch you are looking for is P/N 83133

Here is the link to the PDF chart of the specs..
http://www.crouzet-usa.com/catalog/sensors/pdf/83132.pdf

[9dreizig]

Brent where are you in N. CAl ?? One of my turbos will be here in a few weeks and I"m between Carson City, NV and San Jose once a week?

[NorCal930]

Near Modesto