Question about 2003 Chrysler PT Cruiser

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Cooling fan doesnt come on with ac on - 2003 Chrysler PT Cruiser

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  • pm2campbell Jun 02, 2009

    cooling fan cycles on and off when engine is warm, but ac has full charge and cycles but of course needs a cooling fan

  • pm2campbell Jun 03, 2009

    i have a charge station and have relaimed and charged 3 times 1lb4oz r134a same result every time.

  • pm2campbell Jun 03, 2009

    how do i test the pressure switch.

  • pm2campbell Jun 03, 2009

    i have checked the fuses with a test light seem to be good.

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Does the a/c work when driving over 30mph, if it does it probual the radiater fan my 03 a/c didn't wrk very good parking and city driving the rad. fan is 2 speed Iwired the high and low together a/c works great and rad. fan. comes on right after I turn on a/c

Posted on Jul 10, 2009

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  • Master
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Hi,

On the fans, they are controlled by either turning on the A/C or by the coolant temp sensor reaching thresholds to turn on one or the other fan. If the fans don't come on when you activate the A/C then they also won't come on when the coolant temp asks them to. So there is probably a failure in the current supply to the relays that control the current to the fans, or the electrical signals to activate the relays. The power for the fans come off a 20 amp fuse in the power distribution center under the hood (behind the battery). The fuse is red and is the second in line from the front, on the inner row of 5 fuses in the double row array of 10 fuses. So see if that one is blown or has a subtle crack in it. The fuse sends power to the high and low speed fan relays and the A/C clutch relay on red/light green wires (pin B of the relays) all located in the power distribution center. So if there is power at those three pins, then if the powertrain controller is working properly those three relays should send power on to their respective devices when called upon. However there is also a fuse in the under dash fuse box that must be patent to provide the power to operate the coils of the three relays: it is a 10 amp fuse located in the lower right hand corner of the maze of fuses. It might be labelled for that purpose, or be called F18 or be between pins 39 and 40. I don't have a vehicle nearby to look at for labelling issues but others have told me the numbers I call out from the wiring diagrams don't seem to relate to the actual situation in the box. In any case this is the right most fuse in the bottom row of 7 fuse sockets. So make sure that fuse is patent also. If both the fuses I have described are good then the A/C clutch and the fan relays should work when called upon, unless there is a common mode failure to provide the grounding of the actuation coils which is the responsiblity of the Powertrain control module. So let me know if none of the relays work and yet the fuses are good.

Thanks.

Posted on Jun 03, 2009

  • taran_2005
    taran_2005 Jun 03, 2009

    Have you checked the relay as well?

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  • Chrysler Master
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The fan is supposed to come on when the AC is on, or when the car water temperature goes over 228 degrees.

To start check the cooling fan fuse located in the fuse box. If the fuse is fine, and replacing the fuse does not solve the problem, then it may be an AC problem.

The fan is started by the AC when there is not enough pressure in the AC because of a leak or because the AC is low in gas, the fan will not start. Low AC refrigerant pressure, or a bad AC pressure sensor or problems with the transducer on the AC line can cause the fan not to start.


Posted on Jun 02, 2009

  • Ginko
    Ginko Jun 02, 2009

    That happens because AC does not have enough pressur to trigger the fan. The fan is started by a pressure switch when te AC is on.


    That means that the AC is low in freon, go to a car dealer and have gas recharged.



  • Ginko
    Ginko Jun 03, 2009

    In that case test the AC pressure switch, it is probably faulty and it is not operating the fan.

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Posted on Jan 02, 2017

  • 200 Answers

SOURCE: the cooling fan turns on

That's ok. This will not hurt anything.

Posted on Sep 01, 2011

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