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Author Topic: Temp gauge sits around cold while driving then climbs to 90 degrees when statina  (Read 2226 times)

Offline N4SOP

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Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« on: 11 November 2012, 18:20 »
*I took the GTi for a long run today (100 miles) and noticed the temp gauge sat in the cold sector all the time until I got stuck in some traffic. Then it climbed to 90 degrees and sat there until I moved again, then it fell into the cold sector.

At all times the heaters blew hot air so I'm guessing it the Temp Sender?

I noticed while sat at motorway speeds it seem to hunt a little almost like a very slight missfire. Does the Mk4 Temp Sender do more than just control the gauge? Got a feeling it also talks to the ECU about mixture etc?

Any help would be great :)

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Offline Granta Gti

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #1 on: 11 November 2012, 18:34 »
Defo sounds like a thermostat  :smiley:
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Offline rio_gti

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #2 on: 11 November 2012, 18:35 »
thermostat mate its stuck open do its constgantly flowin thru the rad and alwayd coolin down when on the move  :wink:
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2000 GTI 1.8t ARZ, S2000 filter, DSG intake, Forge 007 dv, Catch can, R-tech custom remap, 3" Supersize Silicone TIP, Powerflex dog bone, 'The Beast' FMIC, Ultimate delete, LCR fuel pump, 3" Turbo back, K03 hybrid, Ported Manifold, S3 injectors, 80mm maf = 280bhp 270lbft :evil:

Offline Ant1981

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #3 on: 11 November 2012, 18:37 »
If you're constantly blowing hot air, then it's getting hot, so it possible it may not be the thermostat.

If the temp actually were cold, would your blower have any hot air?
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Quote from: Lewy on 14 September 2011, 23:39
80% of your posts are total tripe, as they are mostly replies to sh1te posts created by the morons that, unfortunately this forum attracts.

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Offline Granta Gti

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #4 on: 11 November 2012, 18:43 »
Mine did exactly the same and I thought it blew out hot air until I changed the thermostat and then it was HOT!
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Offline N4SOP

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #5 on: 11 November 2012, 18:47 »
Cheers for the replies guys  :smiley:

Is it an easy-ish job to replace the thermostat? Rough cost of one?

My concern was that the gauge never went above 90 degrees, even when stationary in traffic. Didn't want it to overheat it it was a sender fault rather than the thermostat.

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Offline rio_gti

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #6 on: 11 November 2012, 18:50 »
never goes over 90- that means your fans are working!!!

about £12 and less than an hour to do  :smiley:
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2000 GTI 1.8t ARZ, S2000 filter, DSG intake, Forge 007 dv, Catch can, R-tech custom remap, 3" Supersize Silicone TIP, Powerflex dog bone, 'The Beast' FMIC, Ultimate delete, LCR fuel pump, 3" Turbo back, K03 hybrid, Ported Manifold, S3 injectors, 80mm maf = 280bhp 270lbft :evil:

Offline N4SOP

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #7 on: 11 November 2012, 18:54 »
Great stuff  :smiley:

I'm coming direct from Vaux ownership so my VW knowledge is a little lacking at the moment!

I'll do the sender first then look at the stat  :smiley:

PS. The fan must be VERY quiet..
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Offline gm8

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #8 on: 11 November 2012, 19:00 »
done mine the other week , heaters go from warm to hot enough to bake bread  :evil: bit fiddly but 30 min job , no need to remove alternator either
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karls3abo

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Re: Temp gauge sits around cold while driving then climbs to 90 degrees when statina
« Reply #9 on: 12 November 2012, 20:26 »
Just changed mine :) only thing I will say is the bottom bolt is a paint to get at as the alternator is majorly in the way! A ratchet spanner would be a good idea its a 10mm bolt, Also be careful of the dipstick as I found out it is very very! Fragile I barely touched it and it snapped off lol, now  I temporarily have a silicone hose to hold my stick haha. But it's now much hotter! Lovely in the mornings
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