Cooling fan 1 keeps going out what's the problem 03 impala

 

Hi Bigguy82,

Welcome to the Chevy Forums.

The thermostatic fan control switch may be defective. It may have a loose wire.
Or you may just have bad grounding in general.(Given it's an 03) I'd say try doing a temporary bypass on the TFCS,( to also be sure the fan itself isn't toast) and see what happens.

At this point in time, replacing your "big three" would probably be in order.

 

I replaced the the fan and the relay 1 but check engine light still on then it will go off?? How much do u think it will cost if it is something with the ground wires????

 

And what's the big three???

 

The "Big Three" are your Positive battery cable, your Negative battery cable, and your Engine-to-body(or firewall) ground strap.

The wires are inexpensive. The trick with the engine-to -body ground is to install a 4 or 6 gauge negative cable in a more exposed area, in the event the old ground strap is inaccessible. You really can't "work on" or "clean" corroded wires, they must be replaced.