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boston_blacky's avatar
Jan 19, 2016

A/C ok drivers side but only on/off passenger's side (P0483)

My Dodge RAM Laramie 2005 (2500) 5.9l works very well but A/C passenger's side (only) is driving DW nuts! Driver's side works fine. I figured getting that A/C issue fixed may also remove an error code (P0483) which appears occationally when I turn the ignition key on/off 3 times without starting.

Error code {P0483} does not always show - approx. 50% of the time when dumping codes. Just hope I don't need to change the clutch fan as the engine temp. always remains cool or cold! Here's what I saw on line about this reappearing problem.

P0483 Description
The electric cooling fan is controlled by the Engine Control Module (ECM) through the cooling fan relay based on inputs from the following components:

- The engine coolant temperature (ECT) sensor
- The intake air temperature (IAT) sensor
- The A/C selector switch
- The A/C refrigerant pressure sensor
- The vehicle speed sensor (VSS)

The ECM controls the cooling fan by grounding the cooling fan control circuit which turns ON the cooling fan relay. The cooling fan relay will be commanded ON when the following conditions are met:

- The engine coolant temperature reaches 106°C (223°F) or more.
- The A/C clutch requested.
- The vehicle speed is less than 38 MPH.

The cooling fan relay will be commanded ON regardless of vehicle speed when the following conditions are met:

- The engine coolant temperature is 151°C (304°F) or more.
- The A/C refrigerant pressure is high.

The cooling fan may be commanded ON when the engine is not running under a fan run-on conditions described in the electric cooling fan general description portion of the service manual.

Thanks for you time and sorry to be so long winded.

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