Hi, in your cutlass if you have Air conditioner you can turn it on and the fan should start in a minute maximum, if it starts when turning on the AC means that the fan relay and the motor are OK.
Another test is force the computer to send the signal that turn on the fan making a bridge with a clip between the terminals AB where the scanner can be connected. The scanner connection is down the dashboard at drivers side. It has 12 available connections as shown below:
FEDCBA
GHJKLM
With the switch off put a clip connecting terminals A and B and then put the switch at the position where the lamp tests are on just before cranking (do not crank), at this moment the fan should start if the relay and the motor are OK (computer is sending the signal).
If the fan starts with any of the tests described above means that your temperature control sensor is not working.
Regards
Replace the Temperature control sensor. Located at the engine near the thermostat housing. you can trace the wiring back from the fan to the sensor. If the fan still does not start. Try spining it by hand with the switch off. If you hear any noise at all.it may be the fan clutch. While you're at it check that wires to the fan aren't boken or pinched .
SOURCE: 2001 Grand Am GT radiator fans will not run
Hi, where was the car loosing water from please?
SOURCE: Nissan Altima running hot
When the car is completely cool,check the electric fan(s) for smooth rotation.
Clean/check/change the thermo sensor,contact and wire.
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Excavate air pocket in coolant system / check for head gasket leak
This test will kill two birds with one stone.
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MAKE SURE THE COOLANT SYSTEM and ENGINE IS COLD!
RAN THIS TEST IN A WELL VENTILATED AREA ONLY!
You will spill some coolant during this air pocket purge test.......BE
KIND TO THE ENVIRONMENT and ANIMAL please clean up after the test!
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Put the front end on a pair of ramp or park your car on a VERY STEEP HILL (radiator facing top of the hill) .
Top of the coolant reserve tank
Let it ran for 10-15 minutes.
Monitor for air pockets escaping from coolant reserve tank.
Small amount of bubbles is OK at 1-5 minute mark
After the thermostat open up (after 195 F warm up) at
5-12 minute mark or after high idle you should see less bubbles.
If you do not see any in rush of bubbles then your thermostat may be
partially stuck or rusted badly inside the thermostat hosing.
Give the thermostat host few gentle taps.
If you see larger bubbles surfacing after 15 minutes then should do a
hydrocarbon (HC) dye test to test for potential head gasket leak.
Let engine cold down and top off coolant reserve tank.
Start monitor for coolant lost
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A coolant flush is require every 2 years or 24,000 miles.
I recommend the thermostat that has a relief pop-let to reduce the change of burst radiator and coolant hoses.
Make sure you get a new thermostat gasket,black RTV and fresh coolant for the job.
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SOURCE: 92 honda accord is running hot but radiator fan is not turning
Connect the fan directly to the battery to test
SOURCE: 93 honda accord keeps getting really hot and fans won't turn on
fan relay or coolant temperature sensor
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