Question about Carrier 38CKC042 Air Conditioner

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Low Pressure reads HIGH. High Pressure reads LOW??? Not cooling much.

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  • nefmart Jul 01, 2009

    Where is this Valve. MY AC guy wantsto replace the entire unit. Only 6-7 y/o.

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Stuck in heat mode

tap on reverse valve lightly

Posted on Jul 01, 2009

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2 Answers

Cruze ac problem both side pressure riding good lp hose too much cool hp normal hit compressor engage good condensor fan good but cooling low not good cooling drive time


Your question was somewhat confusing. It sounds like you may have a set of gauges that you hooked up to your high or low side? Without a proper set of gauges to read the pressures it would be hard to properly assess the problem. A/C is all about pressure/tempeture Depending on the age of your car, you have r-12 or post 90' or so 134-a. Whatever the temperature is that day your pressures should be within a range . If it's too hi or low would indicate a problem. In the mean time it never hurts to clean your coils in a car you're probably only going to be able to clean the condenser. So I guess I would have to need to know what refrigerant you have and what were the pressure readings. You did say that when you turned on your AC the compressor was working?

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1 Answer

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What is the high side reading? That's too high for low side maybe overcharged. Plugged expansion valve (no orifice tube) will cause low to neg psi low side.

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1 Answer

High pressure on the low pressure side, blows warm air


But the High Side is reading what pressure (200)
What is the Low Side (34)

Give me the Numbers

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1 Answer

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Never seem that kind of reading's, what are the reading's? with those kinda reading's could be bad compr.

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1 Answer

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while the machine is running, partially block the outdoor fan until the high pressure reaches 270 psi, the low pressure should be 70 psi at this time. This should be true within 10 lbs.

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2 Answers

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You need to have the system vacuum evacuated, using a vacuum pump and a set of gauges, to verify that it is holding. You also must install EXACTLY the amount or refrigerant that the system calls for. Too much or too little will result in failure.

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A/c should be charged on the low side while engine is running. Make sure high side valve is turned off. Low side reading should be around 32-35 psi at idle high side should not go above 250. I hope this helps,good luck

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I think you have a leak. I would get some dye . The local auto parts store sells it with a black light. Then check for leaks .

Good luck

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