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You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.
When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?
Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.
If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.
Does the fan really run until the battery goes dead?? OR are you afraid that it might run until the battery is dead?? In many cars, the fan will continue to run for a short time after you shut it off.... until the engine coolant is cooled to a certain point. It can also run for a while when you've been using your air conditioner. Now, if it is actually running continuously and won't turn off, there is a sending unit somewhere that isn't functioning correctly, either in your cooling system... or your air conditioning system. You're going to need to do some research and find out which sending unit might be the culprit..... or take it to the shop. They'll know what to do and can probably quickly fix it.
To start with, you are talking about the temp gauge. The thermostat is in the engine. The coolant system could be low or have air pockets and still look full. First thing I would check is the cooling fan, then the coolant level.
My suspicion is that the fans may be coming on but they are not picking up speed when you turn on the A/C. Your car would have some of relay to control the speed of the fan whenever the A/C was turned on. This relay system would also increase the speed at which the fans run when the engine heat turns them on too.
Try starting the car cold and turning on the A/C right. Even though the engine is cold the rad fan should start up when you switch on the A/C. Once the engine gets hot the fan speed should increase accordingly when you switch on the A/C.
I'm not familiar with how Chrysler makes this work so I'm unsure what to repair but this is most likely your problem. Hope this helps.
You may have one conventional belt-driven fan with a thermal clutch and the other electric or, both could be electric on your car.
The cooling fan that operates during non-AC operation (just a running engine) if electric, will be controlled by a thermal switch in the lower radiator tank and may not turn on at all unless the engine is warmed up.
The belt-driven fan should be turning at some speed all the time if the engine is running and at much higher speed with a hot engine.
The fan that cools mostly when the AC is operating won't run under normal operation but may turn on in hot weather (or when the engine is under heavier loads) even without the AC operating.
Checking them would require having a warmed-up engine and the AC turned on.
Both fans regardless of type should be turning then.
Yes,it is the blower resister,it controls all the speeds to the blower motor,it is located near the blower motor,and it might have a wire harness that is burned up too,replace it,and the wire harness,and the blower motor,the blower motor is what causes the resister to fail,it draws too many amps,even though it might sound good,and run fine,it is requiring to many amps to run it.If this was at all helpful,please rate,thank you.
when it's on 'auto', the fan adjusts according to the temp in the car and the temp setting you have it set at. try setting the auto temp control down to 65, then hit the "-" one more time to send it to "LO" - the fan should automatically jump up to max.