car overheating....

Discussion in '96-04 - 2V Specific' started by freeryde, Apr 16, 2007.

  1. freeryde

    freeryde New Member

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    well, the fan doesnt come on so i'm sure thats the problem. there is nothing wrong with the fan, pulled it out and had it running straight off the battery, but once its in in wont come on. not sure what the problem might be.
     
  2. Thomas_W

    Thomas_W Well-Known Member

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    might be smart to try the basics..

    fuses, relays, plugs. etc
     
  3. freeryde

    freeryde New Member

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    well the plugs are fine, where can i find the relay
     
  4. phil_the_thrill

    phil_the_thrill Active Member

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    look at the fuse diagram in your owner's manual. it will show you where the fan relay is. then you can replace it
     
  5. freeryde

    freeryde New Member

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    errr. dont have owners manual. does anyone know off hand....
     
  6. AaRoN

    AaRoN King Post Whore

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    the autozone website has a great toubleshooter.
     
  7. freeryde

    freeryde New Member

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    k thanks
     
  8. 97blackgt

    97blackgt Well-Known Member

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    there is a fuse in the engine compartment fuse box, and there should be a relay for high and low speed, under the hood or under the dash i think?
     
  9. freeryde

    freeryde New Member

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    do you know what # the fuse/relay is?
     
  10. 97blackgt

    97blackgt Well-Known Member

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    the lid should be labeled...if not let me know i might be able to find out real quick
     
  11. freeryde

    freeryde New Member

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    just says relay with numbers 1-4 on the lid
     
  12. 97blackgt

    97blackgt Well-Known Member

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    what year is it and do you have a gt or a cobra?
     
  13. freeryde

    freeryde New Member

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    '96 gt with 01' buillitt swap
     
  14. 97blackgt

    97blackgt Well-Known Member

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    The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM) to provide control of the cooling fan and A/C clutch. The module includes the PCM power relay to provide power to the PCM.
    These relays are contained in one housing, resulting in longer service life and reduced wiring requirements for operation.
    Cooling Fan Motor Relay
    The cooling fan motor is controlled during vehicle operation by the constant control relay module (CCRM) (12B581) and powertrain control module (PCM) (12A650) which energizes the cooling fan motor under the following conditions:


    When the engine temperature is higher than normal the cooling fan motor starts operating at 105°C (221°F) and stops when temperature drops to 94°C (200°F) .
    When vehicle A/C is on and vehicle speed does not provide enough natural airflow, the cooling fan motor starts running at or below 69 km/h (43 mph) and stops at 77 km/h (48 mph) .
    Low Fan Control Relay
    The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the LFC relay is normally high (B+) . In this state the low speed cooling fan runs continuously. To turn the fan off, The PCM grounds this circuit, pulling it low (near zero volts). A "fail safe" is built into the LFC circuit to run the fan anytime the EEC power relay is activated, should the PCM fail open circuit.

    High Fan Control Relay
    The High Fan Control (HFC) relay circuit operates the high speed electric cooling fan. If the Engine Coolant Temperature (ECT) sensor relays a high temperature or overheat condition to the PCM, it activates the HFC. In order to turn the high speed cooling fan on, the PCM grounds the primary circuit of the HFC relay. The secondary circuit applies B+ to the cooling fan motor.

    The pins in the CCRM are 1,2,5,6 i believe i hope this helps maybe? i couldnt find the relay numbers
     
  15. freeryde

    freeryde New Member

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    mmm somewhat, its more of just a run down of how it works, do you know where the ect sensor is?
     
  16. 97blackgt

    97blackgt Well-Known Member

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    on the head
     
  17. freeryde

    freeryde New Member

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    ya thought there was another one. hmmm thanks
     
  18. 19mustang95

    19mustang95 Legend

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    you know what, i believe there was something wrong with the fan relay switch..you might wanna see if there was a recall on yours.
     
  19. scarface

    scarface Guest

    there is a coolant temp sensor on the intake, if its bad the fans wont come on....
     
  20. freeryde

    freeryde New Member

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    ok thanks i'll check