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AC problem

Tiny
BRAUNS BUTCHER BLOCK
  • MEMBER
  • 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 Replies

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Pressure build on the low side?
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Sunday, June 17th, 2012 AT 5:31 PM
Tiny
BRAUNS BUTCHER BLOCK
  • MEMBER
  • 7 POSTS
Yes
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Sunday, June 17th, 2012 AT 5:39 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 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.
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Sunday, June 17th, 2012 AT 6:14 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Like I said before you need both pressures for diagnoses.
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Sunday, June 17th, 2012 AT 6:17 PM
Tiny
BRAUNS BUTCHER BLOCK
  • MEMBER
  • 7 POSTS
The high side is 40 and the low side is 80 withon can of freon
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Tuesday, June 19th, 2012 AT 6:06 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
That is not possible. Reonfirm the pressure reading.
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Tuesday, June 19th, 2012 AT 6:20 PM
Tiny
BRAUNS BUTCHER BLOCK
  • MEMBER
  • 7 POSTS
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
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Tuesday, June 19th, 2012 AT 8:21 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
The low side is too high whereas the high side is below expectation so a faulty compressor is the likely cause.
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Wednesday, June 20th, 2012 AT 12:47 PM
Tiny
BRAUNS BUTCHER BLOCK
  • MEMBER
  • 7 POSTS
Thank you
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Wednesday, June 20th, 2012 AT 6:08 PM

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