Question about 2002 Chevrolet Trailblazer Ext
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Posted on Jan 02, 2017
YOUR FAN CLUTCH IS A ELECTRO VISCOUS PCM CONTROLLED FAN CLUTCH.SOUND LIKE THE FAN CLUTCH IS BAD.IT SHOULD HAVE LESS RESISTANCE WITH COLD ENGINE.AND HOT ENGINE THERE SHOULD BE INCREASE IN RESISTANCE.IF NOT FAN CLUTCH HAS FAILED.REPLACE IT.
Posted on Aug 13, 2009
SOURCE: where is the cooling fan
The cooling fan speed sensor is built in inside the fan clutch.
If you have a code p1481 or similar , pointing at the cooling fan speed sensor, often you have to fix or replace the wiring , rather that the sensor.
Check that wiring has continuity, the wire to sensor must have +5V. Here an interesting website on trailblazer fan system.
Posted on Oct 03, 2009
Just replaced the water pump on my 2004 trailblazer the other day, removed the fan to get the water pump out. You do not have to remove the fan just to change the belt.
Posted on Jan 28, 2010
TSB#05-06-02-012B: Service Engine Soon (SES) or Check Engine Light On, DTC P0480, P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) - (Oct 19, 2006)
Service Engine Soon (SES) or Check Engine Light On, DTC P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness)
Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.
This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness.
Replace the engine cooling fan harness using the procedure listed below.
1. Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.
2. Place the cooling fan assembly on a bench.
Disconnect the harness electrical connector from the cooling fan clutch.
3. Remove the harness from the plastic guide while feeding the wires out of the slot.
4. Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.
5. Feed the wires into the slot and install the harness to the plastic guide.
6. Connect the harness electrical connector to the cooling fan clutch.
7. Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.
Part Number 89024920
Harness Assembly, Engine Cooling Fan Wiring
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Posted on Apr 29, 2010
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