The cooling fans on a 99 Nissan Maxima will not come on if the coolant temperature sensor is defective. The fan only comes on when the temperature passes a threshold.
Usually between 220 and 230 degrees.
When 1990 Honda is running cooling fan does not come on but comes on when engine is off and I thermostat and temperature switch changed?"
replace the cooling temperature sensor
The 2000 Chevy Cavalier cooling fan shroud is held in place with 10 retaining bolts. Remove the retaining bolts and the cooling fan shroud will come off.
Usually 210-230 degrees F.
Check the temperature sensor
The cooling fan comes on when the engine reaches a certain temperature and is controlled by a sensor switch that kicks the fan on when the temperature reaches the preset temp.
Cooling fan should come on either when coolant temperature reaches 235 degrees or the A/C or defroster is turned on
The engine temperature must reach 232-235 degrees in order for the cooling fans to come on. They will shut off at about 195-200 degrees. Also when the air conditioner is on the cooling fans automatically come on regardless of temperature.
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