Question about Ford Thunderbird

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While the acr is running, the air conditionong compressor turns on for 2 seconds, then turns off for 3 seconds. This cycle continues for as long as I leave the A/C on. As I try to recharge the A/C system the pressure reads 155 P.S.I. while the compressor is off and drops to a range from 35 to 55 P.S.I. As I turn on the A/C, the air blows warm.

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Well, there are a couple of things to try, bypass the low pressure switch (jumper wire) and see if the system will ice up or not. Your low number 35 to 55 sounds like it is in the ballpark. The high number sounds like it is coming up short. I had good luck at Autozone with their partscomputer. If you get a really good counterperson they can look up the operating range for your low and high cutout pressure switches. They can be changed without losing all the Freon.

You want a steady low range, like 40, without fluctuation. That means you have constant flow taking heat out of your car. It means it will cool as good at idle as at 70mph. A weak low pressure switch will cut out too early, and can cause fluctuations.

Several things determine pressure in the system. There is valving in the compressor and if the compressor is worn, you have leaks between the high and low sides. The system needs a big difference between high and low. The drier is another part which can plug up, making it hard for the freon to pass through it. This problem raises pressure, but is not helping cooling because the flow is restricted. You should know these things because you may need more than a pressure switch.

I would check the operating range of the low pressure switch and try a new one. Install it and see what happens. If the low range does not get steady and keeps going up higher than 45, bleed off some Freon and see if it stabilizes.

Moderation is the Key. You do not want the compressor to cut off except when the oblong black tank is Iced up.

I hope you find my Solution very helpful.

Posted on Apr 06, 2011


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