2005 Chevy Silverado 5.3. Fan motors turn on mysteriously and with AC on the motor misfires

Asked by z85chevy Aug 25, 2015 at 11:35 PM about the 2005 Chevrolet Silverado SS Extended Cab RWD

Question type: Maintenance & Repair

I'm back to square one. My battery died and had a replacement installed. Next
day, with the AC on the motor began to mis-fire.  Fuel smell was all in the
truck. Took it to my mechanic who ordered a tune up, replaced all plugs and
wires. Mis-fire continued. Got the truck back and drove it for two days. Truck
would not start. The motor fans began to run in the middle of the night and
drain the battery. Back to the mechanic and a new computer was ordered,
flashed to my VIN and installed. Less than a week later, the truck is back to
same issues: mis fires with the AC on and fan motors are running without key
in the ignition. Is is a bad computer part?  Ignition? Something else?

3 Answers
30,465

Tom answered 8 years ago

What did he find on the first repair? Change a computer is almost insane ... since the introduction of Boeing's 777 there is not one mechanical linkage from the pilot to the control surfaces. The plane is "Fly by wire" .. my point is that over 500 people's lives are dependant on that computer not failing. To have 1 fail in a car is very,very unusual but to have 2 fail with exactly the same failure is unbelievable. First thing you have to do is find a mechanic instead of a "Parts Changer"

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DakZ71 answered 7 years ago

Did you find the fix to this issue? I am having the very same problem.

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