Expert needing a answer guys

Tiny
CAROLINACARCONNECTION
  • 1998 GMC YUKON

Expert here needing some help with a/c
my truck is a 98 yukon. Had some a/c problems causing the high side to be super high and kick out. Got my blockage fixed but my high side is still running up there pretty high 350-375. Have I blown my compressor? System has been flushed oiled and vac'd and charged with the correct amount of r134.

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Saturday, August 25th, 2012 AT 9:41 PM

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Tiny
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Ps new condensor new reciver dryer new orifice tube.

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Saturday, August 25th, 2012 AT 9:45 PM
Tiny
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What is the low side?

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Saturday, August 25th, 2012 AT 9:57 PM
Tiny
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55-57 psi ambent temp is about 96-98

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Saturday, August 25th, 2012 AT 10:15 PM
Tiny
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There seems to be too much freon in system.

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Sunday, August 26th, 2012 AT 6:11 AM
Tiny
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Its not a overcharge issue. It started running high when the first 8 ounces were added

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Sunday, August 26th, 2012 AT 5:30 PM
Tiny
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Was the system evacuated? If it is not overcharging then there is air in system. Both low and high are showing high pressure.

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Sunday, August 26th, 2012 AT 5:36 PM
Tiny
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Yes the system was vacd for 45 minutes and pulled to 29hg v. From what I understand 55 psi on the low side is fine for 100 degree ambient

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Sunday, August 26th, 2012 AT 5:52 PM
Tiny
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Here are the specifications.

Referigerant is 36 ozs without rear unit and 64 if with rear unit.

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Sunday, August 26th, 2012 AT 6:15 PM
Tiny
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At 2000 rpm thats right where im sitting on the low side. High side shoots sky high and kicks out

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Sunday, August 26th, 2012 AT 6:20 PM
Tiny
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If you are sure the expansion valve, condenser and referigerant is correct, the other thing that can cause this would be the condenser is not being cooled sufficiently. Try spraying a fine shower of water onto the condenser and repeat the test. I don't think it is the compressor that is faulty because a bad compressor would not be able to push very high pressure, unless the relieve valve internally is stuck and supplying excessive pressure.

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Sunday, August 26th, 2012 AT 6:29 PM
Tiny
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Its a new orrific tube. No expansion valve on my truck no rear air. Condensor is new

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Sunday, August 26th, 2012 AT 6:38 PM
Tiny
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Condenser is new but is it of the correct size? Is the cooling fans working correctly and drawing sufficient air through it to cool it well?

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Sunday, August 26th, 2012 AT 7:46 PM
Tiny
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Yup its the extreme duty condensor larger than stock. Clutch fan is removed and twin 16 inch e fans are in place

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Sunday, August 26th, 2012 AT 8:11 PM
Tiny
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Check the fan blades to see they are moving in the right direction. Did you try my sugestion of splashing water on the condenser to test?

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Sunday, August 26th, 2012 AT 8:41 PM
Tiny
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The fans are running correct. Havent got back to the shop to get my manifold yet

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Sunday, August 26th, 2012 AT 8:56 PM

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