Buick cooling fans

LynnM

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Nov 16, 2006
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#1
Make
Buick
Model
LaSabre
Year
2002
Miles
70K
Engine
3.8
Going to be in heavy traffic this weekend.. 2002 Buick what is the easiest way to check the rad fans ? At what temp are the fans supposed to come on and where is the sensor that turns the fan on?
Thanks Lynn
 
Joined
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#2
The "easy check" would be to turn the AC to its coldest setting. The rad fans should come on shortly afterward, especially if you rev the engine.
 
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#3
Some vehicles were using the engine temperature sensor to control the cooling fans, really dumb, would result in engine thermal cycling between 195 to 235*F, not good with an aluminum head engine with seven times the expansion rate as the cast iron block.

Would purchase a 160*F temperature sensor from JC Withney and mount that midway on the radiator tank, this way would stay at a constant 195*F.

Made a big deal about playing with limited fan control and positively worse in slow city traffic, really not much load from the fans driving at 70 mph on the interstate, fans have a windmilling effect, practically no load on the fans as well. Another option is to purchase an aftermarket digital thermometer with the sensor mounted on the neck of the thermostat housing.

Fuel economy is worse in city traffic where about 90% of the driving is, what does Tricky Dicky do? Drop the speed limit on the interstates from 70 to 55, 1973 to around 2015 when they finally got back up to 70 in some areas. Vehicles that were geared to drive at 70 mph for best fuel economy, got a lot worse at 55.