dmc535

Can anyone give me a little help with this one... my service soon light is coming on, and I noticed when it happens the cooling fans come on. They sound like they are on full blast.. high..!
thanks.. any input is appreciated..

ChrisLT1conv

Your computer is kicking into default. I bet when the fans come on your car smooths out and runs good. The computer is pickingup something faulty with a sensor and when it goes into default operation the fans come on as part of that operation. I had this happen to my 94 and it was the right side o2 sensor had went bad.


What year car do you have?

dmc535

it's a 95

rodj

Pull the codes
http://www.corvettebuyers.com/c4vettes/codes.htm

dmc535

ok.. i did the paper clip diag.. and I got C12 on 1. which means no trouble there.
Then I got H64 0n 4. I looked it up and it's a historical Right O2 - Lean exhaust.
could this cause my fan to come on like that ?

thanks ChrisLT1conv sounds like you might have hit right on the head..

ChrisLT1conv

Yes this is exactly what mine did friday. same code; same symptoms. the car ran a little rough then the fans would come on full blast and the car would smooth up. I relpaced mine and it runs perfect now. I took the battery cable off after replacement to reset the computer too. I'm glad you found the grimlin under your hood. Save yourself some trouble and buy an O2 socket at autozone. they cost like 10 bucks and they are worth every penny.

dmc535

i have noticed it was runnin a little rough.. usually on start up.
thanks for the help.. i really appreciate it..

ChrisLT1conv

I'm glad I could help out. Best of luck to you. Mine is getting 2 more miles to the gallon since i changed the sensor out.