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Marty
Marty, ASE Certified Technician
Category: Car
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Experience:  ASE & Bosch Certified Master Tech. Over 30 years experience.
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Porsche 928 S: MyA/C does not engage when I push the a/c button.

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MyA/C does not engage when I push the a/c button. On my 944 it was the relay. I have a 928 with the same problem. Where is the a/c relay switch located on the 85 928s?
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Customer: replied 4 years ago.

Ok please find the answer. I really need my a/c.

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Hi, and welcome. My name isXXXXX apologize for the wait. There is no compressor relay on your 928. Power to the compressor comes from the a/c switch on the dash and passes through the evaporator temperature sensor then goes to the low pressure switch on the drier and on to the compressor. If your system is low on refrigerant it will cause the compressor to remain off. The low pressure switch at the drier can be bypassed to check for compressor operation. If the compressor runs with the switch bypassed the problem is either low refrigerant or a faulty low pressure switch. If there is no power getting to the low pressure switch the problem could be the evaporator temperature sensor or the a/c control in the dash or a wiring fault. Further testing will be necessary to see if power is reaching the evaporator temperature sensor. Please let me know if you have any questions.
Marty, ASE Certified Technician
Category: Car
Satisfied Customers: 54022
Experience: ASE & Bosch Certified Master Tech. Over 30 years experience.
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