Where is the temp sensor that turns cooling fan on. Both the AC and the cooling fan comes on when you turn on the AC. But the cooling fan does not operate on its on, just changed the waterpump, thrmostat and belts because it was leeking too. Fan stop working then heater hose broke, changed that but no fan then waterpump started leaking so changed that too but fan still not working. Which sensor should i change one by thermostat housing or the one by waterpump outlet?
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If the cooling fans are not coming on when the vehicle is overheating try this.
Look for the coolant temp switch B. it will be located near the thermostat housing on the back side of the passenger side of the engine (follow the lower hose to the engine). It will have a white with green wire and a black wire. Unplug it, turn the key to the run position, the engine does not need to be running. ground the white with green wire. if the fans come on replace the coolant temp switch B sensor.
i am confused you have not mentioned your problem but it sounds like your engine cooling fan is not working? if so try replacing the cooling temp sending unit located on or near the thermostat housing. in fact disconnect it while engine is running and it should turn fan on in a few seconds.goodluck
The fan should come on between 217 and 223 degrees. That is normal operating temperature when the computer sends the signal for the fan to operate, Did you bleed the cooling system after you replaced the sensor?
The accy fan you are refurring to is actually the a/c consensor fan.The only time that fan operates is with the cycling of the a/c system.Verify by turning a/c on ,fan should come on & off with a/c cycles..
Cooling Fan Temp Sensor is the First thing You Check (with what you have described) Cooling Fan Should ALways come On When The A/C is turned On as A/C Adds A Load to Engine, If Temp Sensor is Faulty it Will Not Give GROUND Signal to ECM >For COOLING FAN >RELAY to Give ground and turn ON The Fan.
There ARE 2 temp Sensors that Serve Different Purposes 1 is for Dash READING GAGE & Or TEMP LIGHT the Other is For ECM or Fan Relay (SAME Thing) you Said>""can disconnect the sensor and fan continues to run" < This Leads me to think you Changed the Wrong One. Not Questioning your Skills Just Here to Help.
TEMP SENSOR FOR 3.1L V6 is Located upper RH rear of engine compartment, near exhaust system. Temp SENSOR for 2.3L Engine is Located in LH rear of engine compartment. I Hope this Helps Lead you to a NON-OVERHEATING Pontiac.
Good Luck and Have A Great Evening. rejakwilson
If While A/C is on Fan does not come on I would Check Fan By unplugging it first than apply Pos+ and Neg- to it if it comes on that's eliminated Then go to step 1-3 one of them is bad I usually replace Engine temp sensorsno mater what they are Crucial components for the safety of the Engine.
Electric cooling fans do not run all the time. They will only come on if the engine exceeds normal operating temp. Also will run when AC is on. Easiest way to make sure they are operating properly is to first verify they run when the AC is on. Next turn the AC off and run the engine at 2500 rpms sitting still and monitor the temp gauge (don't let it get into the red). The fans should come on after 10-20 minutes (depending on outside temp.). As the engine cools down they will turn off.
the sending unit has went bad. it comes on with the ac because it designed to overide the high temp sending unit or switch. should cause less then 50 bucks to get it replaced and only a few bucks if you do it yourself