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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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heater problem
Hi Guys,
I have noticed that my heater stopped working. Whenever I move the lever to "echo" or "auto" and then move the temp lever - there is no affect. Only cold air. I checked the heater valve and it does seem to close when I start the engine so no problem there. When I shutdown the engine it is opened and then I can feel the heat from the vents. I read that the problem may be with the inside temp sensor. If it is faulty the heater will not turn on. There is also an outside temp sensor but I am not sure if I have it (its a 1980 model)... My questions are: 1. Is there any fuse relay that I have to check? 2. How can I make sure that the inside temp sensor is ok? how can I test it? 3. Where is the outside temp sensor and how can I test it? 4. Is there anything else I should look at? Thanks!
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Porsche 928S 4.7L 1980 European redhead 
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09-22-2013, 10:31 AM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
Posts: 4,528
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the outside temp sensor is under the left headlight,
the inside is on the console behind the small grill next to the vent outlet. The WSM has diagrams and wire colors for the sensors, remove the right side console cover and find the wire bundle to check the sensor strand. I had this issue and it turned out to be 2 relays were bad, one was the HVAC relay and the other may have been the blower relay, I hope Alan will jump in here as he has the diagrams to cross ref the circuits
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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09-22-2013, 11:19 AM
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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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The blower works fine so no problem there. I will try to find the HVAC relay (didnt know that there is such relay)
In case it will be ok, how do I verify that the temp sensors are ok?
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Porsche 928S 4.7L 1980 European redhead
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09-23-2013, 01:59 AM
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Registered
Join Date: Apr 2009
Location: Israel
Posts: 352
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Quote:
In addition, how can I know if the temperature sensors (inside and outside) are good or faulty? Thanks!
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Porsche 928S 4.7L 1980 European redhead
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09-25-2013, 03:08 AM
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Registered
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Quote:
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1986 928S 32 valve engine All stock, automatic, 539 Weissgold Metallic, 70K original miles, Hankook Ventus 2 tires. Previously owned: 67 Vette, 427 L88 Stingray, 74 De Tomaso Pantera L. Latest addition: 2000 BMW Z3 Roadster |
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09-25-2013, 06:04 AM
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