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this has crept up withing the past 2 days. the radiator fans have begun constantly running while the car is running. they stop when I cut the car off though. bad coolant temperature switch? or partially stuck thermostat?
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Low coolant possible cause. Stuck Fan Relay possible. What happens when you turn on A/C. Possible coolant temp sensor. A/C on both fans should come on when compressor cycles. Only one fan should operate with A/C off and coolant reaches proper operation temp.
OHD - I think that both fans will turn on when the coolant reaches the max temperature on the sensor.
Drummer - When you first start the engine and the fans are running, unplug temperature senor A. That way you know for sure that the coolant temperature is not too hot. Sensor A is on the thermostat housing. If the fans stop running, then you pretty much verified the sensor as the problem.
that is correct. regardless if I run the A/C or not, both of the fans engage when they are signaled to. my coolant level is perfect, and I am not running hot, I just had the timing belt set replaced in January. I did just put 1200 miles on it in a span of a week, but I travel a lot for work so it's not uncommon.
Unplug the fan-switch-A to verify that the fans DON'T run when it's unplugged. If they don't run, then it's a bad fan switch. If they still run, then those 2 wires in that plug are shorted against each other somewhere(!).
'05 Saab 9²x aero (RIP)
2 '07 Civics
'09 Saab 9³ss
'10 Saab 9³sc
this is intermittant. they didn't constantly run the past 2 days. then tonight on the way home from work, they started again. when I got home, I let them run until the Tem. guage was well below where the fans would not run. I can not find a sensor on the actual thermostat housing in the back, but there is one on the loo alike housing in the front that the top radiator hose goes into. I unplugged that, and they still ran.
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