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Dan, ASE Certified Technician
Category: Chevy
Satisfied Customers: 2270
Experience:  20 Year Factory Trained Current GM Technician
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2004 chevy silverado 2500hd 6.

Customer Question

2004 chevy silverado 2500hd 6.0L overheating changed thermostat bleed air out of system still over heats put blower fan on radiator no change 40,000 miles on truck
Submitted: 8 years ago.
Category: Chevy
Expert:  Dan replied 8 years ago.
check the fan clutch first. GM has a bulletin on this: I have replaced a few of them.


Some customers may comment that the engine is overheating. This condition mainly occurs on 4WD 2500 series models that are equipped with a snowplow.


A lower fan clutch disengage speed, resulting in insufficient airflow passing through the radiator to trigger fan clutch engagement, may cause this condition. The snowplow may also contribute to interrupted grille airflow, which results in the fan clutch not sensing the warm air coming off the radiator and consequently not engaging the clutch.


Replace the fan blade clutch assembly with a new fan clutch that has a higher disengage speed.

Dan and 2 other Chevy Specialists are ready to help you
Customer: replied 8 years ago.
fl truck no plow 2wd hoses ok
Expert:  Dan replied 8 years ago.
It still can be the problem. To check: get the engine up to operating tempature or slighty over 220 degreese, feel the air flow coming out of fan. should be noticeable more than when cold. Turn truck off when warm. make sure the fan blades have resistance when turn by it when cold.
Also, is the temp guage right on the cluster. Does it go all the way back down when turn off?
Customer: replied 8 years ago.
ty i will try it
Expert:  Dan replied 8 years ago.
Does the temp guage on the cluster go all the way down when turn it off?
Customer: replied 8 years ago.
yes ty already found problem put flushing machine on upper small hose on resavior going to radiator sucked air out of rad it works also found small leak at water pump gasket all is good now fan clutch ok thanks again never had to that before