AC PROBLEM

  • Tiny
  • brauns butcher block
  • 1999 Volkswagen Beetle

I had it completely evacuated and put 1 can of freon in. 80 # on low side and have no way of checking high side. Presure builds as car is running with ac on

Sunday, June 17th, 2012 AT 4:56 PM

9 Answers

  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

Pressure build on the low side?

Was this
answer
helpful?
Yes
No
Sunday, June 17th, 2012 AT 5:31 PM
  • Tiny
  • brauns butcher block
  • Member

Yes

Was this
answer
helpful?
Yes
No
Sunday, June 17th, 2012 AT 5:39 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

Without knowing the high pressure side, it is not possible to pin point the exact fault.

Possible causes are : a) If low pressure hose and check joint are cooler than around evaporator, the expansion valve is faulty.

B) If the suction pressure is lowered when condenser is cooled by water, you have excessive referigerant in system.

C) If high and low pressure equalized as soon as compressor is stopped, the compressor is faulty.

Was this
answer
helpful?
Yes
No
Sunday, June 17th, 2012 AT 6:14 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,246 posts

Like I said before you need both pressures for diagnoses.

Was this
answer
helpful?
Yes
No
Sunday, June 17th, 2012 AT 6:17 PM
  • Tiny
  • brauns butcher block
  • Member

The high side is 40 and the low side is 80 withon can of freon

Was this
answer
helpful?
Yes
No
Tuesday, June 19th, 2012 AT 6:06 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

That is not possible. Reonfirm the pressure reading.

Was this
answer
helpful?
Yes
No
Tuesday, June 19th, 2012 AT 6:20 PM
  • Tiny
  • brauns butcher block
  • Member

I had a small garage look at it and put a full charge in it. It 200# in high side and 80 in low side. He thinks the compressor is not sucking in. Thought it should be 40# in low side

Was this
answer
helpful?
Yes
No
Tuesday, June 19th, 2012 AT 8:21 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,938 posts

The low side is too high whereas the high side is below expectation so a faulty compressor is the likely cause.

Was this
answer
helpful?
Yes
No
Wednesday, June 20th, 2012 AT 12:47 PM
  • Tiny
  • brauns butcher block
  • Member

Thank you

Was this
answer
helpful?
Yes
No
Wednesday, June 20th, 2012 AT 6:08 PM

Please login or register to post a reply.

Similar Questions