Have a 2000 blazer, live in Arizona, and the radiator fan bogs down the acceleration. It seems the fan clutch kicks in and is noticeably loud. Is this normal? Changed the fan clutch, radiator cap, thermostat, still does it. In cooler weather, acceleration is fine, just when its around 90deg.

 

Clutch fans will rob power, which is why many people switch to electric fans. Clutch fans are loud, but not with a squeal or anything--just a lot of rushing air at high RPM's. Considering everything that has been changed... I'd check other pullys; power steering, alternator, water pump... they all make the same funny noises.

Cooler air makes more power than hot air, for several reasons; Cooler air is denser and contains more oxygen per cubic centimeter of air and denser air expands more during the combustion process.

Also, check to make sure your Air Conditioning is not on--guaranteed to lose a few HP and MPG's anytime you run it.

 

Thanks, I was guessing I would eventually change to an elec fan.

 

I agree with everything you say, BUT where do electric fans get their power from

 

call me crazy but I think the strain the alternator puts on the engine is FAR less than the strain from a mechanical fan...

 

Hmm? Could it be the fan blades of an electric is more efficient than the blades of a clutch? Is an electric thermo controlled just like a clutch? Cause a clutch coasts most of the time. IDK.

 

Had, have em both. Like the electric fan better. Quieter and temp never budges like before. I have a 98 blazer and put in a 2001 dodge intrepid dual fan. Fits like it was made for the blazer. Cowl is full coverage of radiator pulling air through every square inch. And top end power no, but from a dead stop I believe there is more power

 

^this^