Engine Size: 350
Refrigerant Type: 134
Country of Origin: United States
My 95 Suburban is having a bit of A/C problem. The front blows good but the air is not that cold. The back A/C is cold but as soon as I turn both systems on at once it just about throws the surpentine belt off and then eventually it comes off. I have talked to a couple of people some say it may be a clog somewhere and others say it is the A/C compressor. Was thinking about have the A/C compressor replaced but not sure what else should be done while the system is evacuated. The low side and High side readings are well within range. Anyone have any suggestions.
Can you post the readings. Saying they are within range does not help us much.
GM had a service bulletin concerning a problem with this vehicle. I thought it was for the 94 but could have been later. The issue is the rear expansion valve and the location of the sensor bulb. The condition is that the rear TXV does not operate properly and allows for liquid refrigerant to be introduced into the low pressure return line and this liquid refrigerant migrates to the suction side of the compressor. If the amount of liquid refrigerant is retaliative small...the compressor may be able to handle this charge...however, once the amount becomes excessive, the compressor may 'lock' due to this injection of liquid and this condition could result in a 'thrown' belt.
The bulletin required removal and replacement of the rear TXV and proper location and attachment of the sensor bulb. I shall search for the TSB and post, or perhaps another can locate it and post to the site.
Also keep in mind that pressures are well within range only when the system is totally and completely recharged utilizing the correct recharge equipment.
It could be that damage has occurred to the compressor...but from your description, it does not appear to be so. However, the ingestion of liquid refrigerant will result in damage to the unit.
Good luck !!!
The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
I have recently heard this was a common problem in 94/95 and there were numerous warranty issues over it. The compressor is on the slack side of the tensioner so if the compressor takes a slug of liquid the sudden torque raises the belt tensioner and the belt slack behind the harmonic balancer pulley allows the belt to fall off the idler pulley. The fix is to prevent liquid from reaching the compressor by installing an accumulator with an anti-siphon hole.
I cannot vouch for this myself, it's just something I happened to read.
I've saved hundreds on service by spending thousands on tools.
Edited: Fri April 27, 2012 at 10:35 PM by buickwagon
We had a 1994 factory R134a dual-air Suburban from 2000-2010, and we never threw or broke a serpentine belt. We did go through several R4 compressors though. all from leakage, none seized. By the time we sold it in 2010 the rear AC had quit, figured that the rear expansion valve was clogged/inoperative by then, but second row passengers (didn't have many) never complained even on 110 F days, so we left it as is.
We didn't decide to sell because of that, but that wasn't worth fixing just for us, the Sub had 225K miles on it. I was asking $1994 on craigslist, $1 a year.
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