I swaped the relays and checked all the fuses and changed the temp sending unit. the fans will come on when the a/c is on but not when the vechicle overheats. what else can i do?
If you bypass the temp sensor for the computer and the fan does not come on, and you know the fan and the relay works, that leaves the computer. The computer grounds the fan relay with a signal from the temp sensor.
SOURCE: 2004 pontiac aztek cooling fans not working
relays control fans high and low. does fan come on with a/c on?hot wiring only will create more expensive problems in future!!!!! 2004 not 84
SOURCE: Engine overheats on Pontiac 2002 GP
Check the catalytic converter. If it is clogged, it will reduce your your power and increase the temp of the car, especially on steep inclines.
SOURCE: my 1998 pontiac sunfire is getting hot but not overheating
the fan may be bad but you can find the hot side of the plug and run a hot to the battery and see if the fan comes on. if it doesent you know you have a bad fan if it does you can run a wire to the fuse panel so that it comes on when the car does and shuts off when you shut the car off
SOURCE: overheating 2001 pontiac aztek
remove coolant.remove thermostat remove bottom radiator hose to water pump.put a empty container under the radiator.take a water hose put it where thermostat goes flush out the rust in block.watch the water as it come out the water pump .if stream water is small keep flushing until you get a study sream of clear water. also flush out radiator. lower water pressure dont flush radiator it with high water pressure you could burst it. make clean the over flow jug .make sure it not stopped up.put in a new thermostat and radiator pressure cap. fill radiator with half antifreeze and half water.bleed the coolant system.
SOURCE: 2001 Pontiac Aztek is overheating. I put in a new
it could be the radiator isn't working properly, I had that problem with my Dodge truck and even though my radiator had been replaced two years earlier when I took it to a radiator shop I discovered it was bad and that was the problem the whole time.
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