Question about 2003 Chrysler PT Cruiser

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I have a 2003 pt cruiser and the fans will not come on when the air cond. is engaged. I swaped out the relays but still do not work. The fans are working when the coolent is up to temp.

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The PCM determines engine coolant temperature from the coolant temperature sensor. The combination coolant temperature sensor has two elements. One supplies a coolant temperature signal to the PCM, and the other element provides a coolant temperature signal to the instrument panel gauge cluster. As coolant temperature changes, the coolant temperature sensor's resistance changes, resulting in a different input voltage to the PCM and gauge. When the air is cold, the PCM provides a slightly richer air/fuel ratio and higher idle speed until the proper normal operating temperature is reached.

  1. Turn the ignition switch to the OFF position.
  2. Detach the coolant temperature sensor electrical connector.
  3. Using a DVOM set to the ohms scale, connect one lead to one terminal of the coolant temperature sensor.
  4. Connect the other ohmmeter lead to the remaining sensor connector terminal.
  5. With the engine at normal operating temperature, approximaterly 200°F (93°C), the ohmmeter should read approximately XXX-XXXX ohms.
  6. With the engine at room temperature, approximately 70°F (21°C), the ohmmeter should read approximately 7000-13,000 ohms.
  7. If not within specifications, replace the engine coolant temperature sensor

Posted on May 27, 2010

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