Odd Fan behavior - ZR-1 Net Registry Forums

-=Jeff=- · 10-08-2009

I mentioned this before but I was looking into it again last night

I have a fan with a mind of its own it seems. At first i thought it was Fan2 but it is Fan1. Sometimes on start within 5-10 seconds it will run, even when the car is cold (sitting for a few days)

Last night it did not turn on right away but did soon after the car was started. When i got home form using the car I connected my laptop to it, there was no fan requests of any type and the ECM was not commanding the fans (1 or2) on, yet fan #1 was running.

The only thing I can think of is that possibly the ground wire for the relay is shorted to ground some where, I need to spend more time looking into it, but I thought I would post to see if anyone else had some ideas

on the positive side, at least the fans runs instead of not running at all

I also did check the CTS and it seems to be reporting the correct Temp as well

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10-08-2009	#1
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,169	Odd Fan behavior I mentioned this before but I was looking into it again last night I have a fan with a mind of its own it seems. At first i thought it was Fan2 but it is Fan1. Sometimes on start within 5-10 seconds it will run, even when the car is cold (sitting for a few days) Last night it did not turn on right away but did soon after the car was started. When i got home form using the car I connected my laptop to it, there was no fan requests of any type and the ECM was not commanding the fans (1 or2) on, yet fan #1 was running. The only thing I can think of is that possibly the ground wire for the relay is shorted to ground some where, I need to spend more time looking into it, but I thought I would post to see if anyone else had some ideas on the positive side, at least the fans runs instead of not running at all I also did check the CTS and it seems to be reporting the correct Temp as well __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978