1995 Tahoe checked ac and had very little pressure and compressor not coming on. started to charge the system and compressor started working (well cutting off and on) then noticed the can would not finish going in system (still on first can) put it in hot water to speed up the process and checked the pressure in the system now it said about 100psi?? compressor not coming on anymore even after releasing pressure down to about 25psi. and no cool air in the cabin either. what should i try next??
Country: United StatesMake: ChevroletModel: Tahoe 4x4Year: 1995Engine: 5.7
Hello and Welcome to Just Answer. My name is XXXXX XXXXX X will try my best to assist you and your 100% satisfaction is my goal. I have been working on these vehicles for over 10 years so I am very familiar with this system and how they work. However, keep in mind, that I need some solid concrete facts/evidence/clues from you in order to give you a good answer about your vehicle. Please realize that all my answers are based solely on the info that you provide me with.Does the AC compressor run if you were to jumper the AC pressure switch?Are you using a can of freon from the parts store to fill your AC system?
havent tried a jumper but i would think so since it did run when i first started filling the system. yes the can was from the auto parts store advance short can
Ok.. how did you recover the freon in the system before charging it up with the freon in the can?
didnt just checked the pressure and then started to charge it
Ok.. how much freon did you put in?
only 1 short can.. i dont know why the guage would say almost zero then jump to amost 100 psi only after one can.. have done this before with another gm car and it always took about 2 can but i always check the psi after each can..
How may ounces or pounds are those cans?
Is this a crew cab or does it have rear air?
its a 2 dr tahoe no rear ac/heat controls only the front
Ok.. if the freon was empty when you charged the system, your freon is just too low preventing the compressor from engaging. Your system takes 2.0 lbs of freon. There is 16 OZ per pound. This means you don't even have 1.0 lb of freon installed into the AC system. You need at least 1 more can.
okay but when i started the system said almost zero then the compressor started to cut off and on when putting in the 12oz can then stopped (the compressor) then i checked the pressure and it said 100psi which is way to high. out of fear of having to much pressure in the system i released the pressure till it went down to 25 psi. then stopped. so now the system says 25 psi and the compressor is not coming on. and no cold air in the tahoe. i guess the cheap gauge could be wrong but should i try and put more in the system
The problem is that you don't know how much was in the system to begin with. The correct way is to evacuate it, put it in a vacuum for 15 minutes, let it sit for another 15 minutes and then recharge it with 2.0 lbs of freon. Short of doing this is simply guess work. All bets are off. In addition, the gauges and pressures are not reliable because you don't know how much freon is in the system.
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