Quote:
Originally Posted by krayzie
This problem was pretty common with the Mk5 Golfs. It was fixed by replacing the secondary fan (my old Golf GTI) or both fans (my friend's old Golf S). We weren't able to monitor the fans with RossTech VCDS (if there is a parameter to read, I wasn't sure where it was), so I'm not sure if Toyota Techstream can monitor the operation of the fans.
Pretty easy to test on a very very hot summer day with the car parked and engine started. The primary fan should come on after the engine starts, and then as soon as A/C is turned on, the secondary fan should come on.
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Tried the AC on as well with high coolant temp. Primary fan spins on full but second fan stays idle.