A/C condenser cooling fan

Tiny
FRANCISJANSEN
  • MEMBER
  • 2007 DODGE RAM
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 341,000 MILES
A/C condenser cooling fan is not engaging.
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Tuesday, July 7th, 2020 AT 12:25 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good afternoon,

Does the A/C work? If it does. can you give me the high and low pressure readings?

The radiator cooling fan should come on at 208 degrees and go off at 180.

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works

I attached a wiring diagram for you to view. You need a test light or voltmeter to do some tests.

https://www.2carpros.com/articles/how-to-check-wiring

Roy

OPERATION

The A/C condenser fan used in gasoline engine equipped models (except SRT 10) is controlled by the powertrain control module (PCM). When the A/C-heater control is set to any A/C position, it sends a request signal on the CAN-B bus to the totally integrated power module (TIPM), which then transfers the request on the CAN-C Bus to the PCM/ECM, which sends a signal on a dedicated hard-wired circuit to the totally integrated power module (TIPM) to energize the internal A/C condenser fan high side driver. When energized, the A/C condenser fan high side driver provides battery current to the condenser fan motor.

The A/C condenser fan control system is diagnosed using a scan tool.

The components of the A/C condenser fan cannot be adjusted or repaired and must be replaced as an assembly if found inoperative or damaged.

Radiator cooling fan clutch

A thermostatic bimetallic spring coil is located on the front face of the viscous fan drive unit (a typical viscous unit is shown in. This spring coil reacts to the temperature of the radiator discharge air. It engages the viscous fan drive for higher fan speed if the air temperature from the radiator rises above a certain point. Until additional engine cooling is necessary, the fan will remain at a reduced rpm regardless of engine speed.

Only when sufficient heat is present, will the viscous fan drive engage. This is when the air flowing through the radiator core causes a reaction to the bimetallic coil. It then increases fan speed to provide the necessary additional engine cooling.

Once the engine has cooled, the radiator discharge temperature will drop. The bimetallic coil again reacts and the fan speed is reduced to the previous disengaged speed.
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Tuesday, July 7th, 2020 AT 12:47 PM

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