Question about 2004 Chevrolet Silverado

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The fan speeds are not workig on my 2004 Chevy quad cab. Compresor ok. Can feel some cool air out of vents when driving. Please help

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Check fuses then try turning the fan to high and give the heater motor a bump underneath the dash on the passenger side .. this will usually get them spinning and will tell you if it's worn out. Another thing is a resistor that fails that is located about 10 inches to the left of the motor but they usually give some sign the are failing by dropping speeds first.

Posted on Jul 29, 2010

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I have a 2002 Dodge Ram Quad Cab 4x4. The a/c runs great as long as the truck is moving, but as soon as you come to a stop it starts blowing warm air. Please help.


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Front & rear ac is "ok" on high RPM but on low does not cool at all,I'just change compresor. Is it any filter in those lines,maby.


Theres no filter for the rear a/c lines, the problem is the lines themselves are too long. On low speed, by the time the cool air reaches the rear vents, its already warming up again.

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The air vents are control by vacuum line and or linkage.

Listen for hiss or feel for vacuum leak under the dash,

Feel for broken linkage(s) that are close to the vents.


WORK BACKWARD if you have small hands to feel out where is the missing link.

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Same Problem, warm air at low RPM's 2006 Saturn Vue


I agree with philip, i have not studied the electrical system. but to my best guess the electric fans are tied into the engine cooling system. when the engine is not requesting the fans to come on. then their is very little air passing threw the cooling package. When their is no cool air passing by the condenser this will not draw the heat out of the refrigerant leaving excess heat in the system and when the cab fan blows this is were the excess heat is getting dumped. then at higher speeds their is enough air passing threw the condenser and radiator to cool them both.

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I have a 2000 Dodge Dakota Quad Cab 3.9L V-6 w/ cooling problems


Check coolant, adjust drive belt, check radior core and radiator grill clean, remove and chweck thermostat, check cooling fan, check ignition timing, water ppump may be going out, improper grade engine oil.

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your speed switch located in heater box usually one wire to it in passenger feet area above "TOES" usually you loose 1 or 2 speeds on fan but it is unplugged or completely cooked good luck!

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