MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: Tadpole99 on November 16, 2013, 04:17:49 pm

Title: Cooling Fan on when engine is cold?
Post by: Tadpole99 on November 16, 2013, 04:17:49 pm

Hi there,

My engine cooling fan goes on and off even when the engine is stone cold, when the fan comes on it stays on for maybe 15 seconds spinning at a very high speed then turns off again for a few minutes.

Any ideas why this is?

Title: Re: Cooling Fan on when engine is cold?
Post by: Bow on November 16, 2013, 07:54:46 pm

That be the air con fan more then likely mate. Turn of your heaters fan in car and see if it still does it

Title: Re: Cooling Fan on when engine is cold?
Post by: Tadpole99 on November 18, 2013, 07:46:11 pm

With the aircon off (ECON mode on) the fan still does this

Title: Re: Cooling Fan on when engine is cold?
Post by: Bow on November 19, 2013, 02:13:38 pm

Mine does as well. it's the air con fan apparently. Sure one of the Mk5 gods will comment soon lol

Title: Re: Cooling Fan on when engine is cold?
Post by: john87 on November 21, 2013, 08:15:53 pm

If your A/C is switched off (A/C light off in later cars / ECON light on in earlier cars) then none of your radiator fans should be running when the engine is cold.

I believe the mk5 is prone to the coolant temperature sensor failing, which may fool the system into bringing the fan on, possibly this is your problem?