mwneedham

Although my AC works, I have no heat when the temperature control is in heat setting. Have sent the CCU for repair. During diagnostics, a direct signal was sent to the electric motors for the mixing flaps....no activity. It appears both my motors are shot. Is this the case? Also, thought there was a thread about an alternative replacement motor available rather than the $558.00 each Porsche OEM replacement part. Did a search and no luck.

Any thoughts, advice or alternatives are appreciated. Thanks in advance for the help.

MWN

jimq

buy used from a breaker. I paid $100 for 2 a couple years ago and they work like new.

Metal Guru

A scan with a Hammer pinpointed two issues with my HVAC that I wasn't even aware of. Had a bad floor/vent damper servo and a seized booster fan out back. I was able to confirm and repair both issues.

mwneedham

Thanks for the suggestions so far. Best deal I could find from a "breaker" was $150.00 each. Anyone have any for sale or know of a better source?

Thanks again,

MWN

tbennett017

They are becoming expensive. You can also confirm your problem visually by pulling of the plastic valance inside the frunk, and observing the motors move (or not) based on a partner changing settings from within the car. Some have had limited success opening up the servos and cleaning them, but often they 'burn' on the contacts in critical places, making repair almost impossible.

ToreB

Have a look at my HVAC DIY page, there's some pictures of the servos and how to determine faults.
www.ccu.tore.bergvill.com
Cheers,
Tore

jimq

I got mine from Oklahoma foreign but it was 2years ago.

Bearclaw

I bought 2 from http://www.weekendrides.com/ a couple years ago, it seems like they were ~$125 a piece, if memory serves.

Smesh

Hi Tore.

On this page, the link to the 964 servo motors page does not work. Is there an updated link for this? Thanks dude!

Makmov

Yeah, I just got a fresh air servo for 100 at DC. The reostate strip was burned on the old one. Otherwise there is not too much to the inside of one. A really basic board some gears an the motor, which I am sure is good, just the board and the tips of the brushes are scorched.

Smesh

Where is DC?

ToreB

Smesh, John's pages are no longer on the internet. Here's a cached version:
http://web.archive.org/web/200811152...cal/servos.htm

Can I be of any assitance?
Cheers,
Tore

Makmov

http://dcauto.com/

f3nr15

Hey Tore;

If you're still out there, I note on your HVAC page that the servo units are the basically the same motors with different arms/attachments. Is it easy enough to interchange the arms/attachments between servos, or is this not possible?

tbennett017

I have been curious as to the same thing. Looking at several, it seems to me that they differ. The boards have different markings, and I suspect they are intended to sweep different amounts based on the flap they are moving.. 90 deg vs 135 etc..

??