I'm having a similar issue, but then mine is only on when i'm moving. the fan comes and goes, and i was told it may be a short in the system. i think this just may be a defect in the 2003 model because i've heard of a few people complaining about their a/c not working properly.
The fans generally only run when the car has reached a certain temperature then will shut down. usually as soon as the temperature needle in your car has passed the half way mark the fans go on. then they will turn of when the temperature is between the 1/4 and 1/2 mark in the gauge. but if its not that then you may have an electrical issue with the fan
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the fan setting sounds like a bad blower resistor or high speed relay but i would say the resistor, the air problem may be related to the controls or vacuum leak. check the engine area around the intake and make sure the vacuum lines are good and there are no leaks as this heater system is vacuum controlled, depending because some are actuator controlled also listen under the dash for a hissing noise as that would be a vacuum leak, another thing is to remove the control and check for vac leaks at controller.
talking about the ac? if so does the ac compressor come on? if not try ading freon if the ac compressor is on and lines get cold/and enough freon is in the ac system,,look for blown fuse or relay thats bad
It is connected to the thermostat to regulate the temp meaning when should the fan blow & when not. I dont know why the resistor will work, most pprobably a short-cut method to make it work till you replace the thermostat............sodeep
No its not true,the cooling fan comes on when the coolant temp reaches a certain point it closes the switch in the temp sensor wich in turn closes the relay and powers the cooling fan,the reason it comes on with the A/C is that it's wired to bypass the temp sensor and associated relay because the A/C compressor forces the motor to work harder and the coolant temp to rise significantly faster,the relay needs to be replaced or you will overheat the motor and possibly cause serious damage.
This really sounds like your radiator fan is working. Slow speeds under 20MPH the fan is needed badly. Over 20MPH there is enough ram air to sufficiently cool down the radiator. You should find a fuse for it in the Power Distribution Center under the hood. Check big and small. If the fuses are good and you're convinced the radiator fan isn't coming on, try swaping the rad fan relay with another in the PDC. As far as the "Check engine" lite goes, a transmission fault can turn on the lite. However if your radiator fan is not working that will also turn on the "Check engine" lite.
Good luck with that and let me know if you still have issues.
I had a similar problem, and it turned out to be (of all things) an acorn that had found its way from the fresh air intake beneath the windshield into the drum-shaped blower fan, which is located under the dash on the passenger's side. It is easily removed (I did it myself TWICE with the help of a hand-held mirror) by removing the three torx screws that hold it up. Try this, and you might be surprised what you find in the blower. Hope this helps.
a similar thing happened to my olds which was a 92 2.5, so im not exactly sure if this will help, but just make sure none of you relays melted, because thats what happened to mine and my fan wouldnt go on, therefore overheating my car