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Author Subject: Coolant Temp Issue
black 6

Seasoned Pro

Location: Berkshire

Registered: 09 Dec 2004

Posts: 2,089

Status: Offline

Post #1
Lately the coolant temp gauge seems to get 'stuck' at 70 degrees even after driving for a long time. Then it will suddenly go to over 80 degrees. I suspect the temp sensor is faulty which is the blue sensor correct?
To add to the this when I first start the car the rad gets hot on the right hand side as you face the car so the stat is letting water through. I can't work this out as I changed the stat.

Please help!

________________________________________

Although it's no longer available new, it's worth trying to get hold of a good example second-hand. As GTi's get tubbier and cooler, it's nice to remind yourself of why insurance companies hate hot-hatches so much.-Top Gear on the 6 Apr '01. Black 6
Posted 18th Sep 2009 at 18:02
Rich E Forum Admin

Location: Hertfordshire

Registered: 27 Apr 2005

Posts: 7,757

Status: Offline

Post #2
Fairly easy to work out - the thermostat is leaking! There isn't any other way hot water can get to that part of the radiator.

I'd get it back apart and have a look but I imagine you'll have a broken seal on the thermostat. Sort that first and then see what the temperature gauge is doing.

________________________________________

Rich
Posted 18th Sep 2009 at 18:15
rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,793

Status: Offline

Post #3
yep had this a few times and its always been perished rubber seal on the thermo

________________________________________

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Posted 18th Sep 2009 at 18:20
black 6

Seasoned Pro

Location: Berkshire

Registered: 09 Dec 2004

Posts: 2,089

Status: Offline

Post #4
Rich E wrote:
Fairly easy to work out - the thermostat is leaking! There isn't any other way hot water can get to that part of the radiator.

I'd get it back apart and have a look but I imagine you'll have a broken seal on the thermostat. Sort that first and then see what the temperature gauge is doing.
Fitted a new genuine stat and seal and the right hand side of the rad is still getting hot. Crazy Crazy The thermostat housing cracked when I put it back together but I glued it and there is no water escaping from the housing itself. I started the car up and the water temp went up got to just over 80. Both fans came on for a bit and went off. Temp never really goes above this temp. Any ideas???

________________________________________

Although it's no longer available new, it's worth trying to get hold of a good example second-hand. As GTi's get tubbier and cooler, it's nice to remind yourself of why insurance companies hate hot-hatches so much.-Top Gear on the 6 Apr '01. Black 6
Posted 26th Sep 2009 at 16:05
black 6

Seasoned Pro

Location: Berkshire

Registered: 09 Dec 2004

Posts: 2,089

Status: Offline

Post #5
Anyone?

________________________________________

Although it's no longer available new, it's worth trying to get hold of a good example second-hand. As GTi's get tubbier and cooler, it's nice to remind yourself of why insurance companies hate hot-hatches so much.-Top Gear on the 6 Apr '01. Black 6
Posted 28th Sep 2009 at 03:16

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