A/C Issues
Hotshot
Joined: Jul 2005
Posts: 11,931
Likes: 180
when you turn on the AC, the freon compressor clutch should lock up an dstart turning-- look at that first. next you need a pressure gauge at least for the low pressure side. you should have about 100 psi of gas inside when the compressor is off. when it starts running, the pressure will pull donw to about 35 psi and the high side will go to 250-300, if you have that gauge. if you have under 100 psi not running, or less than 35 when it kicks in, then you need more gass. if the compressor is not turning, it could be no gass, or bad electric.
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New User
Joined: Jun 2007
Posts: 7
Likes: 0
I brought this kit with a guage and filled it to 45 PSI, which is the normal max while the ac is blowing max. What's weird is it will go up to 45psi... you hear a quick click from the engine... which drops the psi low.... then starts building back up to 45... then click... it drops suddenly then starts building again... over and over
Elder User
Joined: Jan 2004
Posts: 805
Likes: 0
From: Pauline, South Carolina
you are describing a system with low pressure, not enough R-134a. The pressure reaches an equilibrium without the compressor running. The the clutch clicks in and the compressor makes high pressure on one side of the orafice and low pressure on the other. Then when the pressure gets to low, a switch that protects the system from low pressure cuts the compressor off, the pressure equalizes and the cycle starts over again. You probably need more freon, but more than that, you need to know where the old freon went. Look at getting a can of freon with a flourescent dye, then you can check for leaks with a black light.
Regarding a blend door, it is the diverter device inside your dash that selects hot or cold air. This does not appear to be your problem.
Regarding a blend door, it is the diverter device inside your dash that selects hot or cold air. This does not appear to be your problem.
Posting Guru
Joined: May 2002
Posts: 2,450
Likes: 2
From: Baltimore
You should consider getting the system completely evacuated and recharged. If you don't evacuate it, you can damage the compressor by continually adding gas.
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New User
Joined: Jun 2007
Posts: 7
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This is what I do not understand... The can states that I should have the ac blowing max. and load up the r134a till 45psi. what i noticed is that as the low pressure hits passed 45psi and into the yellow, it shuts down and starts rebuilding....so in theory, it isn;t shutting down becasue it is to low....it is shutting down because it moved into yellow....correct?
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Elder User
Joined: Jan 2004
Posts: 805
Likes: 0
From: Pauline, South Carolina
No, you're connected to the low pressure side when charging, so when the compressor runs, the pressure should drop and when the compressor cuts off it should increase. Also, if your system has gotten air in it, all bets are off. As the air will never condense into a liquid at the temperatures and pressures within an A/C system, the pressures will not react correctly realative to the temperature curve for R-134a.