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Re: compressor clutch does not engage--100 psi in system-
Could be a few things.
1.) High pressure switch- in high side line (smallwe tubing) with a connector on it. Switch may be faulty- but not usually the case.
2.) Improper freon charge- Freon pressure too high- or too low will inhibit compressor from running.
3.) Compressor clutch no good. Check to see if there is power (12volts) at the connector terminals to the compressor when the engine is running and A/C turned on- if there is and the compressor is not running- you have a bad compressor clutch.
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Re: compressor clutch does not engage--100 psi in system-
The compressor will not run without a minimum amount of R-134A. In some cases the compressor will shut itself down and require a reset (disconnect neg battery cable for 20min) prior to adding refrigerant. Best of luck with your AC issue. Greg
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The most common cause of no clutch engagement is a low state of refrigerant charge in the system. Have a set of AC pressure gauges hooked up and bypass the compressor cycling switch and check the pressure on the low side charging port, you show shop 28-32 PSI at idle.
CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.
The system could be low on refrigerant. The A/C pressure switch will not let the compressor run if the system pressure is below 28psi or above 455psi to protect the compressor from damage. At low pressures not enough oil (mixed in with the refrigerant) will circulate, and at high pressures, the compressor seals will likely blow. You can get a set of A/C manifold gauges for R-134a and check the system pressures yourself or get a shop to check it and possibly add some R-134a. If the system pressure checks good, then the A/C pressure switch, the compressor clutch, or some relays will need to be checked.
Check to see if A/C clutch is engaging. If it is not engaging, the compressor is not starting which will prevent the freon from being sucked into the system.
Look at the front of the ac compressor and have someone turn on the ac from inside the car. The front of the pulley(clutch) will spin when turned on.
If it does not spin, the low pressure switch (LPS) is not satisfied. Meaning there is not enough freon in the system to operate the system. Probably means a significant leak.
The LPS can be jumpered to cause the compressor to run (clutch to engaged) which will draw the freon in the system.
The LPS is usually a two wire sensor on the suction of the compressor. (between evaporator and compressor) Unplug the sensor and install a jumper, this will engage the clutch.
However, if it is empty the leak must be repaired.
The capacity of the ac system will be on a label under the hood, do not overfill. Probably about 2 lbs. Local parts stores (Auto Zone and Advance) will have freon with stop leak. This may help the leak. They also make a freon with a UV dye. I always add a single can with dye so that if stop leak does not work I can find the leak in the future.
The system should be filled until suction pressure is about 36 psi.
you need to put a pressure gauge on the freon input nozzle and see how much freon is already in your system You are probably getting no cooling because the clutch on the front of the A/C compressor is broken, or the switch on the dash is not opening the vents inside correctly.
Putting more freon into an already full system can have unpleasant results.
So if when checking the gauge, the freon levels are ok, next, run the car, and look at the front of the A/C compressor.see if the clutch clicks in and out as the A/C is turned on/off. If the clutch free-spins all the time it needs to be replaced, or if its silent completely, the wiring to the A/C needs to be checked. If the clutch is ok, head under the dash ad listen for the vent doors opening and closing as you cycle the A/C on/off. If you can't hear them, a vacuum pipe or electrical connection/A/C switch is to blame.
Check A/C compressor relay. When you say it seems to be full of gas(freon) have you actually put a pressure gauge on the system? If the pressure is too low, the compressor will not engage. If the compressor relay is functioning, check for power at the compressor clutch. If it has power to it and it still is not engaging, the A/C clutch may need replacing. It is usually almost as economical to replace the complete compressor with clutch installed than to just purchase a clutch. Keep in mind if you replace the compressor you should also replace the receiver/dryer also referred to as the accumulator.
You will have to have a puller for removing it,you can get at auto parts, no very expensive remove the belt remove the nut on front of pulley and use the puller, you dont have to take out the freon. replace and tighten nut to pull new pully in place
Jonathon, I am amazed at some of the answers you have received so far. Let's get a few things straight, first, if your car is a 2006 model sold in the USA, you have an R134a system (mandated by federal law since 1996), so the answers that included mixing refrigerants are of no value. Second, if your system was working last year and you have not added any refrigerant since then, there is no way for your system to be overcharged.Assuming you are speaking of pressure in PSI and temp in degrees Fahrenheit, you are describing the static pressure in most R134a systems. By static I mean the pressure with the compressor not running. At 100 PSI of static pressure, your system is probably undercharged.You may have turned on your AC system inside, however you did not state that you can see the AC compressor clutch actually engaging and turning the compressor. Modern AC systems have low pressure cut out switches that will prevent the system from operating under low pressure conditions to protect the compressor.If you can observe the compressor clutch, watch to see if it is engaging and turning the compressor.If not, you have to make a small jumper (I use a small paper clip) to jump the low pressure switch plug (usually located on the compressor or accumulator) and spin the compressor.If that woks take another reading with your pressure gauge and I think you will find a reading somewhere below 30 PSI.You can then charge your system until you obtain a proper charge.Be sure to re-install the low pressure switch plug when finished. If your AC compressor clutch is engaging and turning the compressor and your low side pressure is 100-150 PSI, then you do actually have a problem that will require professional assistance.Your compressor is either not functioning properly or there is some obstruction in your system that is preventing the refrigerant from circulating properly.Good luck.
If your compressor is working the low side should be 15-38 psi. If you have 100 psi that means the compressor is not doing what it should. Make sure the outer clutch is engaged with the pully. If not A/C system check should be done.