Accepted Answer

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this may be a bad fan switch

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Electric Fan Switch

OPERATION

 

The Powertrain control module (PCM) controls the operation of the cooling fans. This is accomplished by providing a ground path for the cooling fan relay coils within the PCM. The relay contacts will close and complete the circuit between the Maxifuse® in the underhood electrical center and the fan motors. Whenever there is a fan "on" request, both fans will be running. A coolant temperature switch activates the fan motors. A transducer can also activate the circuit, depending upon A/C request or A/C compressor head pressure to the condenser.

See Figure 1

TESTING

 

For electric cooling fan testing procedures, please refer to of this repair guide.

Removal & Installation

 

1. Disconnect the negative battery cable.
2. Disconnect the sensor electrical lead and unscrew the sensor. The sensor can be found on the right side of the engine.

To install:

1. Install the sensor or relay and connect the electrical lead.
2. Connect the battery cable.

 

See Figures 2 and 3

FIG : Fig. 1: Wiring Schematic of cooling fans, relays, and ground

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FIG : Fig. 2: Troubleshooting Basic Starting System Problems

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FIG : Fig. 3: Troubleshooting Basic Charging System Problems

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Edited by tims auto repair on 8/27/2009 at 8:34 PM

Expert:	tims auto repair
Pos. Feedback:	98.4 %
Accepts:
Answered:	8/27/2009

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owns a repair shop...25yrs