Page 1 of 1

Over heating - NO cooling fan

Posted: Wed Sep 04, 2019 9:56 pm
by Sspeed
Hello,

I am having an issue with my 88 stock CTTC overheating. I have root caused it to the cooling fan not coming on. I had a tech come to the house to take a look at it, he forced power to both the A/C fan and main cooling fans through the relay connections and both powered up. However I run the car up to 245 degrees and the main fan does not come on.

He attempted to get into the computer with his Launch software (that what he called it) but the computer would not let him in (im talking over my own head).

My questions are:
What temp should the main cooling fan kick on?
What diagnostic software/tool is required to read into the computer to ensure the ECU is calling for the fan? Tech II?
Did Callaway in 1988 apply a different tune VS a stock corvette during the B2K conversion? Im assuming yes but had to ask.
The thermostat opened, car reads temp on digital dash and the relay is working. Is there another sensor that would stop the fan at Temp 2XX?

Thanks,

SSpeed

Re: Over heating - NO cooling fan

Posted: Thu Sep 05, 2019 4:03 pm
by SurfnSun
The fan should come on at 228. Secondary fan at 238.

Fuses are good? Once you turn the AC on the fan should come on if I recall correctly. Grounds ok?

You can actually use a paperclip to pull codes but a Tech II is the correct scanner.

There is nothing in the Callaway calibration that affected the fan to the best of my knowledge. My B2k's fans ran just like my stock L98.

Might try the fan control switch....it’s cheap. https://corvetteparts.com/item/switch-e ... gIHRfD_BwE

Re: Over heating - NO cooling fan

Posted: Thu Sep 05, 2019 4:07 pm
by SurfnSun

Re: Over heating - NO cooling fan

Posted: Tue Sep 10, 2019 11:15 am
by SurfnSun
Have you made any headway?

Re: Over heating - NO cooling fan

Posted: Tue Sep 10, 2019 11:15 am
by SurfnSun
Have you made any headway?