Question about 2003 Chrysler PT Cruiser

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Cooling fan not coming on where would the

Cooling fan not coming on with the ac on, where would the pressure switch be located
the 134 levels are good and the compressor cycles fine
going down the road with air flow alows it to cool

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Pressure switch is most likely located on the receiver/dryer.
If the fan is failing, there is low pressure in the a/c system.

Posted on Jun 23, 2009

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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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Have you checked to see if you have a proper charge of R-134?

If there is no or not enough R-134 in the system the compressor will not turn on. The fan will not come on unless the high pressure switch is closed completing the circuit for the a/c fan to come on.

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Air conditioner not cooling.....


Hi!

First, I'd try checking your local Library for an AC repair manual. An Ac system has a number of different parts that all work together to cool.

That said, there are some things you can check that are easy.
First, Check the controls. Is the AC on, the blower on, and the temperature selector set on cold? Really check, because this is what is wrong about 10% of the time.

Next, with the car off, find the AC compressor. Is the belt still on it? Have someone start the car and turn the AC on while you watch the compressor. The outer part should turn, and when they turn the AC on, there should be a click, and the inner part will start to turn as the clutch engages.

Next, Look at the fans. If your car has an electric fan, it should come on when the AC has been on for while. If your car has a manual fan, then it might be the fan clutch, but there isn't an easy way to check this.

If it isn't one of the above, then you are probably out of DIY territory. Because of this car's age it probably has R-12, an older type of refrigerant that is no longer manufactured for environmental reasons. The $1100 for the compressor replacement seems high, but that should include evacuating the system and recovering the refrigerant, replacing the compressor, receiver/dryer, and expansion valve, flushing the system of the old refrigerant and oil, replacing the oil some that is r-134 compatible, and installing the updated fittings and o-rings for R-134. You can see how that adds up in terms of time and Parts.

Good luck!

-ellie
Elizabeth.a.greene@gmail.com

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