I have a 2003 Silverado with the 5.3 engine and I would like to install electric fans. Are they available from Chevy or do I need to find an after market set with wiring?

 

Closest thing to stock would be the LS1 fans or to get the new 05 electric fans but they require a larger radiator. Otherwise there are aftermarket ones like Flex-a-Lite and Permacool. I have the LS1 fans and they work great, you can get a harness to run them off of the PCM if you have a tune.