Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.In order to determine the cause of the AC not cooling I need to know what the pressure readings your are getting with the compressor running, normal pressure on a full system needs to be right at 35 to 40 PSI on the low side and 200 to 225 on the high side. Post back with this information and we can work from there. Also if you place your hand on the accumulator with the system running is it getting nice and cold?
The system is to low on Freon and that will keep the compressor from running, Normal operating pressure on a full system with the compressor running should be right at 35 to 40 PSI on the low side and 200 to 225 PSI on the high side. Static pressure (system off) should be right at 100 to 110 on both the high and low side.
Are these reading with the compressor running?
Normal pressure on a full system with the AC compressor running should be right at 35 to 40 PSI on the low side and 200 to 225 on the high side. If you are reading 60 to 65 on both side that usually means the compressor has failed.
Anytime you replace the compressor you need to replace the accumulator , flush the system and replace the Orifice tube as well Did you do that?
You need to purchase a flush kit and remove the lines and flush the condenser, evaporator and all the lines with the flush solution. Actually your 2004 Tahoe has an expansion valve and it usually needs to be replaced when replacing the compressor. It takes the place of the Orifice tube. See it in the link below,https://dl.dropboxusercontent.com/u/104923897/Expansion%20Valvve%20MAy%2028.pdf
By not doing so you could have very likely damaged the new compressor.
It in the evaporator tube and the line has to be replaced , see step two in the link I sent you.