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Model specific boards => Golf mk3 => Topic started by: kailola on 15 February 2011, 19:36

Title: vr6
Post by: kailola on 15 February 2011, 19:36
hi guys this question has probaly come up alot but my fan comes on and does not go off help
Title: Re: vr6
Post by: justalex81 on 15 February 2011, 19:45
yes
Title: Re: vr6
Post by: Khare on 15 February 2011, 19:55
Something wrong there, and probably the thermoswitch in the radiator (which controls when the fan should come on/off) is faulty  :smiley:
Title: Re: vr6
Post by: Wayne on 15 February 2011, 21:06
Faulty switch in the radiator, unplug it and see if the fans stop

Have you got air con, if so switch it off and see if they stop.
Title: Re: vr6
Post by: AlexMozza on 15 February 2011, 21:26
My Dads 307 does that, stay on for about 5mins after car stops :), disconnecting the battery works :)
Title: Re: vr6
Post by: thai-wronghorse on 16 February 2011, 06:57
The fan will start or continue to run on many cars once its turned off, remember it's whole point is to cool the engine down when there is no cold air rushing over it whilst driving.
Title: Re: vr6
Post by: rubjonny on 16 February 2011, 10:12
it may be the rad fan after-run switch wire has snapped off and earthed itself, though i dont know where this is on a vr6 or if it even has one? there is a separate temp sensor on the engien for the 3rdfan speed and i think electric coolant pump somewhere too.

but as above it is supposed to come on after switch off for a bit, but if it stays on for hours something is wrong somewhere
Title: Re: vr6
Post by: tshirt2k on 16 February 2011, 10:19
Quote from: rubjonny on 16 February 2011, 10:12
it may be the rad fan after-run switch wire has snapped off and earthed itself, though i dont know where this is on a vr6 or if it even has one? there is a separate temp sensor on the engien for the 3rdfan speed and i think electric coolant pump somewhere too.

but as above it is supposed to come on after switch off for a bit, but if it stays on for hours something is wrong somewhere

There should be one on the vr6. 16v mk3 have them. Same basic electrics. Usually on the inlet somewhere.
Title: Re: vr6
Post by: rubjonny on 16 February 2011, 10:41
yeah i wasnt sure if that function was taken over by the auxilery coolant temp sensor? because there isnt an over-run switch mentioned on the vr6 rad fan diagrams see
Title: Re: vr6
Post by: tshirt2k on 16 February 2011, 10:58
maybe. But then again from the run on diagrams i couldn't work out the run on worked for mine. Still haven't heard it kick in once engine is off after the temp has risen on heatsoak.

Do you know what temp the after run switches on at? may have a dodgy switch. Got it from danster from an older car. May try my ABF one as i know that used to kick in.
Title: Re: vr6
Post by: rubjonny on 16 February 2011, 13:32
looks like elsawin is missing the 'bog std spec' mk3 radiator fan diagrams, they're all for the VR6 as you can see they include the electric coolant pump :(

need to work back from your wiring i think, the trouble is some ABF looms dont have the rad fan after-run fitted, i might have a couple radiator fan control unit looms kicking about somewhere though i did do a massive wiring loom clearout the other day

oh, the switch kicks in at 100degrees. can test the system by earthing the wire :)
Title: Re: vr6
Post by: tshirt2k on 16 February 2011, 16:23
Quote from: rubjonny on 16 February 2011, 13:32
looks like elsawin is missing the 'bog std spec' mk3 radiator fan diagrams, they're all for the VR6 as you can see they include the electric coolant pump :(

need to work back from your wiring i think, the trouble is some ABF looms dont have the rad fan after-run fitted, i might have a couple radiator fan control unit looms kicking about somewhere though i did do a massive wiring loom clearout the other day

oh, the switch kicks in at 100degrees. can test the system by earthing the wire :)

Thats high. I've tested it and it does work when shorted. Just haven't had it kick in on its own yet. Or haven't heard it.