All Things Mk5 > How to Guides / Troubleshooting

Coolant warning light(check coolant level)

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damo666:
Hey peeps, I've had the Mk5 GTI for over a week now and
loving every aspect of it, other than a slight niggle:
when starting up from cold the coolant warning light
will come on saying check coolant.
I've checked the coolant and levels are above min and no
signs of leaks.
If I turn the engine off and restart the car the warning light
dissapears :scared: is this a dodgy sensor ya reckon?
Cheers,
Damo

S2 Ant:
How cold has it been where you are?
A few of us had the issue with check coolant coming on when its been frosty / icy cold outside and as you say, checking things seem to be fine. Its likely the sensor but only seems to occur when cold

damo666:

--- Quote from: S2 Ant on January 20, 2011, 12:05:12 pm ---How cold has it been where you are?
A few of us had the issue with check coolant coming on when its been frosty / icy cold outside and as you say, checking things seem to be fine. Its likely the sensor but only seems to occur when cold

--- End quote ---
Yeah been below 4•C, so this is common on cold start especially
If cold outside?
Will see what happens when it warms up a bit
Cheers,
Damo

Norbreck21a:
100% guarantee if the level's OK, it will be the sensor in the expansion tank. They corrode over tim and give dodgy readings. Mine was changed just before Christmas for the princely sum of £14.61. Took about 30 minutes to fit. Only ever seemed to fault when the temperature was really cold (never when it was warm).

3 months on, and having driven through December temperatures of -17°C, it's not come back on once. I also know 2 other GTI owners have exactly the same problem, also cured with a new expansion tank.

damo666:

--- Quote from: Norbreck21a on January 20, 2011, 01:41:54 pm ---100% guarantee if the level's OK, it will be the sensor in the expansion tank. They corrode over tim and give dodgy readings. Mine was changed just before Christmas for the princely sum of £14.61. Took about 30 minutes to fit. Only ever seemed to fault when the temperature was really cold (never when it was warm).

3 months on, and having driven through December temperatures of -17°C, it's not come back on once. I also know 2 other GTI owners have exactly the same problem, also cured with a new expansion tank.

--- End quote ---
Sweet, thanks for that matey :happy2:

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