2003 chevy silverado 1500HD LT. A/C fan works intermittently

try disconnecting the battery for 5 minutes to reset the complete system. a few different things cause the reduced power to activate, oil pressure, coolant temp, traction control. I use my snap-on MT2500 to locate these types of problems

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Hi, this is a pretty common problem on these Silverado instrument clusters. We can definitely help you with that. Click here to learn more about these Silverado instrument cluster problems: Dr Speedometer Instrument Cluster Repair Speedometer Repair Guage...

ur acuator doors are bad usually happens when battery goes bad or is unhooked google sparkys answers and theres how to and pictures thats how i fixed my 03 1500hd also until i found out how to fix id go to the fuse box under hood while truck was on and pull ac fuse wait 10 sec replace and it usually blow out front vents until i turned truck off if u recently had battery go bad or unhooked look at recalibration on sparkys answers its simple and might be all u need

Pull the glove box door and the box, then the 3 screws that hold the fan in there, get that thing out of there before it dies and stinks up the place. Or let your cat spend the night. Hope this helps.

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DTC Number
P0160 DTC Name O2 Sensor Circuit No Activity Detected Bank 2 Sensor DTC Number P0300 DTC Name Random/Multiple Cylinder Misfire Detected

the problem is that your instrument cluster has a short circuit and it will need to be replaced you can try a used one but mileage will be off from yours you will have to remove the trim around the cluster then there are 4 screws holding cluster in place

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.

i had the same problem with my 2000 chevy truck!! i took both hoses off engine and flushed the heater core with water and air frome air compresser,added new coolent and it works perfect!!!! so try flushing your system............

There are 2 both located in the block..