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Registered
Join Date: Jan 2005
Location: Long Island, NY
Posts: 3
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964 Climate Control Troubleshooting
Last month (December - winter in NY), I purchased a 1991 Cab C-4. Unfortunately the Climate Control does not work properly. The symptoms are:
1) Constant heat from driver's side & middle vents. Far right passenger's side vent blows cool air. 2) Round thermostat dial (blue & red dots) does not work. 3) Slide Controls appear not to work. 4) Blower fan 0 to 4 does work properly. 5) Defrost button engages & blasts air through vents not to glass. 6) A/C button turns on (yellow light) but the condenser/compressor appears not to engage -- no change in RPM's, etc. I have Adrian Streather's 964 book & it appears that the two mixing chamber Servo valves under the front hood may be bad. Any other ideas? Thanks. This is my 1st post! Pete |
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01-17-2005, 10:15 AM
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Registered
Join Date: Jan 2005
Location: Waterloo,Ontario, Canada
Posts: 10
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Hey Pete, congratulations on a beauty purchase. I cant offer any technical help personally but take a look at (www.porsche964.co.uk)
follow technical link, to electrics, and at the bottom is an excellent article on the heating and servo repair. Loads of photos! I doesnt look to bad to fix. similar problems were described. I hope it helps. Darren By the way just purchased'91c2 coupe in December in Canada.
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'91 c-2 Tahoe blue/Tan '00 BMW M-5 Titanium/Black '1LE Camaro GTB class |
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01-17-2005, 12:52 PM
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Registered
Join Date: Jun 2006
Location: Shanghai, China
Posts: 69
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Do anyone know where to find above article about servo repair? It has been referred in many posts but looks like www site is no more working.
I may have heat servo trouble and would be nice to see how one has repaired them.
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Kind regards, Harri 964 C4 1992, 930 "RS3.0 looker", Carrera 3.0 1976 911 2.4E 1972 (to be 2.4S+ spec race car), 911 2.2T 1967 |
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04-29-2012, 06:57 AM
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Registered User
Join Date: Jul 2011
Posts: 89
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The most common fault in the servos are weared-out potentiometer tracks and burnt whiskers. This is not possible to repair, you'll have to get a spare. I have seen very few, if any, other faults in these units.
I've got a newly updated Porsche HVAC page here, I doubt you'll need any more info than that. ;-) Here's a cached version of the 964 page mentioned above. Cheers, Tore Last edited by ToreB; 04-30-2012 at 04:17 AM.. |
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04-29-2012, 11:25 AM
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