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95 TAHOE won't blow cold

ZMAN on Tue September 08, 2009 7:05 PM User is offline

Year: 1995
Make: chevy
Model: tahoe
Engine Size: 5.7
Refrigerant Type: freon
Country of Origin: United States

Hello all,

Need help. I recently changed my ac compressor and ac blew cold. About two weeks later it started not blow as cold and now not blowing that cold at all. I have checked the freon and it is full. When I installed the compressor i had a leak that i noticed and had lost some of the ac oil. Could that be the problem?

robs on Tue September 08, 2009 7:10 PM User is offlineView users profile

You always want to make sure that the system has the proper amount of oil an refrigerant for the system to work properly. What was the reason for changing the compressor in the first place and how did you verify that the system is fully charged? Sounds to me that you might still have a leak and loosing refrigerant is the cause of the system blowing hot.

GM Tech on Tue September 08, 2009 7:48 PM User is offline

So what magic ball do you use to check the refrigerant and it tells you it is full? There is NO way to know unless you extract and weigh the refrigerant--- 8 ounces has the same pressure as 8 pounds-- refrigerant is a condensible, not a compressible----more pressure does not mean more refrigerant......

You probably have lost about 3/4 of your refrigerant.....extract and weigh it to be sure--- or add some and see if it starts cooling again-- but you have to find and fix your leak--- the number one failure mode of mobile a/c is loss of refrigerant due to a leak.....

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

ZMAN on Tue September 08, 2009 9:49 PM User is offline

Ok I understand. I tried to add some refrigerant today to see if that was the problem. I have a gauge that I bought with the freon that I thought read the pressure in the system. I guess I was wrong. Anyway, as soon as I tried to put some freon in the gauge went up to 55lbs. That is why I did not think that was the problem. I will check all the hoses and connections again to make sure there is no leak.

Chick on Tue September 08, 2009 10:09 PM User is offlineView users profile

How did you charge the system? Did you pull a deep vacuum and charge into the vacuum? If not that is your problem,. you can't have any air in the system, and you need to weigh in the refrigerant.. Throw away those cans with gages, they cause more damage to the system, which is why they are called death kits. You need to monitor the high and low side pressures, not the just the low side...

Email: Chick


Freedoms just another word for nothing left to lose

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