Question about 2002 Chrysler PT Cruiser

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My PT Crusier runs rough when idiling at a stop light and the ac blows hot air. Runs fine at speed and the temperature gage reads normal at all time. Dealer says its the PCM but I am not confident since no codes are listed, are they telling the truth? How do I check that the cooling fan, relay or the PCM module.

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Ok if you want to check the relays and modules, locate the boxx where they are located, use the legend to figure out which is which under there, and pull two identical relays and switch them, if what you want to come on then work, if it didnt before, then thats the problem, if not, then your problems are elsewhere, I'm assuming your cooling fans on the front for the radiator and a/c aren't coming on? but while driving its not heating up because air is forced from motion? lets just hope its the relay or one of the big fuses in the main power block, those are cheap fixes, the other problem could cost you a couple hundred bucks

Posted on Sep 12, 2010

  • kimdodson_ha Apr 20, 2016

    I had the same problem and it was the fan relays.

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1 Answer

Air conditioner compressor runs - freon is up to proper level....not cooling??


BOTH High and low readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;

1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.

2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?

3. What is the outside temperature at the time the readings were taken?
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Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI

Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI

Normal high side reading ranges from 200-350 PSI

Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor

Thank you for using fixya and good luck, keep me posted. Be glad to help you get your A/C running again soon.

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common for the 4WD switch it self to go bad, what happens is the connection in the switch solider goes bad from the heat and current draw from the light. Inspect the switch and repair any signs of damage or replace the switch in the dash.
Below are normal car AC pressure readings with 134A.
  • Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
  • Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI
  • Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor

BOTH readings should be checked to have a better idea of what is going on with an AC system but based on the limited information… the compressor is not engaged or is not pumping. Below are some things I would check;


1. Check the high and low gauge readings with the AC on & set on MAX/Recirculate, middle vents with the engine at 2,000 RPM’s, blower speed on high.


2. Check the vent temperatures with a thermometer from the middle vents, far right & far left vents?


3. What is the outside temperature at the time the readings were taken?


4. Check to see if the condenser fan blowing strong?


5. Notice if compressor clutch is cylcling excessively.


Thank you for using fixya and be safe

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1 Answer

Truck runs rough at start-up in the mornings


If this happens only when the engine is cold or cool, I would suspect a coolant temperature senor that has lost its calibration.
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Good luck, let me know.
Regards,

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