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:cry: I am haveing a lot of trouble with my ac, it died.
I took it to the shop and was told that the system was full but the compressor was not getting any power. I went to the auto part store today and the guys said it could be the ac pressure switch and a easy way to find out is to bypass the switch and hook up direct and if the ac kicks on then I will know if it is the switch or not.. But my problem is that I have no idea how to do this. I will be forever grateful for any ideas or help that I can get.
Tina :?:
 

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Help.. How to bypass a AC pressure switch.

O.K.
HVAC 101
Somewhere on the A/C system / lines will be a Hi pressure cut off and/or possiably a low pressure cut off switch.
These switches are safety's. They prevent the system from operating on a low or to high of a charge. Both of these comditions could ruin the A/C system if it were allowed to run when the pressures were out of spec.
On all A/C systems the big fat hose comming off the compressor is the low pressure (or also called suction) side, this is where the refrigerant travels back to the compressor. The smaller tube comming out of the compressor, is the Hot Gas side or also know as the high pressure side.
You are looking for a wiring connector the has two wires. It should be plugged into a pressure switch. If the switch is bad it will remain open. This condition will interupt the the control signal, not allowing the signal from the control pannel to reach the compressor.
Now when you find this two wire sensor connection on the A/C lines you will need to un plug the sensor connector and jump / bridge the gap with a wire. (bascially you need to take a short piece of wire and plug it into the connector, completing the circuit). Once you find it and bridge the harness. you will need to start the car and turn on your A/C. If the A/C now runs the pressure switch is ad and needs to be replaced.
Your hardest task will be finding it on the A/C lines.

This may sound dumb, but, check the A/C fuse for giggles and grins. You may be pleasently suprised. Some A/C system compressors are fused seperatly from the control system.

hope that helps a little
Dave
 

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Dave, I'm having tha problem also. You say this sensor is on the line? To replace it, will one have to break the seal, losing all the coolant and then recharge or is it external and can be taken off the line itsef? My AC light comes on and I've tried charging but the compressor doesn't kick in. I think this may be my problem too. Mine does have a separate fuse in the fuse box inside the engine compartment. Its a 10 amp and didn't look blown but I switched it out anyway because sometimes you can't tell by looking. Anywa, it was fine so it must be the sensor. I'll check it out. Thanks for the info.
 

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Okay, I ahve found the switch which is preventing my compressor from coming on. Its on the accumulator canister. I jumped across it and my compressor came on but the lines iced over in about a minute and still no cold air. I removed the jumper and replaced it on the sensor and the compressor comes on momentarily and then goes off in about 5 second intervals. I've tried charging my coolant but it will not take any and shows good pressure. I tried charging while I had my compressor working as well but had no luck. Somone told me I might have water in the system if the lines are freezing and I need my system vamped. Can one do this on their own or does it require a trip to the mechanic's?

Should I then assume that my sensor is working since I cannot get it to work even when the compressor is running?
 

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i found a plug going into the ac compressor and it has two wires on it and one is blue and the other is red. i tested the blue one has 12 volts coming from it when the ac is turned on but the red one has no power. is the red one a ground?
 

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ac work can be done at home but i recomend you take it to a shop. you will be much happyer . its freon not coolant. put it this way if you dont know the basics, you dont need to touch such a pressious system as the A/C.
 

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well said, but i was reading into the switch thing theyu were talking about at the begining of the topic and was wondering if there was a fix beside changing out the compressor? i wouldnt touch the compressor part since i have never done ac work on a car or a home lol.maybe ill take it to a shop sometime soon and see whats wrong with it. is this a common problem with the tracer escorts? i used to have a 94 merc tracer wagon and the ac never did that before, allways cold but uses gas when used lol.
 
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