How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt
Matt, Engineer - BEng Hons
Category: Porsche
Satisfied Customers: 20983
Experience:  Mechanical Engineer with 20 years experience in the auto industry, 8 yrs in formula 1 engine testing
12772297
Type Your Porsche Question Here...
Matt is online now
A new question is answered every 9 seconds

I have over 80 psi on low side of the ac system. And I did

Customer Question

I have over 80 psi on low side of the ac system. And I did not add any freon.
Submitted: 1 year ago.
Category: Porsche
Expert:  Matt replied 1 year ago.

Hello

this sounds like you have a blocked line somewhere

1st thing to check is that the AC rad / condenser is clear of any debris and there's nothing in front of the air flow to it, next ensure that the AC pump drive belt isn't slipping and if any doubt replace it.

Also check that if there's a pollen filter to the cabin air inlet that this is clean and free flowing

Next you can test components simply by checking the temperatures by touching them with the system running. with the engine at operating temperature and the AC turned on it should be as follows:

A hot compressor / pump

A hot high pressure refrigerant line from the compressor to the condenser

A hot condenser on the inlet

A warm condenser on the outlet

A warm liquid line from the condenser to the evaporator (before the expansion valve or orifice tube)

A cold evaporator outlet line

A cold low pressure refrigerant line to the compressor

If you get a different result from the above then suspect a blockage in the line or the component whose temperature is abnormal, this can be confirmed with a pressure test

Expert:  Matt replied 1 year ago.

Hi

do you still need help?