Coolant warning light(check coolant level)

[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 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]

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

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]

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.

Sweet, thanks for that matey

[S2 Ant]

Below 4 degrees isnt that cold... i'm talking well in to minus figures, if the cold is affecting it at those warmer temps then i'd def consider changing the sensor if you can clearly see all is well with the coolant level

[McKay88]

With regards to the 6 disc cd changer.... Do u have an ipod cable as this replaces the connection used for the 6 disc cd changer.

If u do then u will either have to pick one or buy another type 

Hope this helps any.....

[damo666]

With regards to the 6 disc cd changer.... Do u have an ipod cable as this replaces the connection used for the 6 disc cd changer.

If u do then u will either have to pick one or buy another type 

Hope this helps any.....

ha ha ha cheers matey, discovered this earlier today,
adios iPod connector 

[damo666]

Anyone know the part number for the sensor in the expansion
tank and a guide to replacing it????
Cheers,
Damo

[damo666]

Anyone know the part number for the sensor in the expansion
tank and a guide to replacing it????
Cheers,
Damo

Anyone????

[damo666]

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.

Hey matey, I spoke to VW Gilders in Sheffield the other day
asking for a sensor in the expansion tank and was told nothing
listed on the system and that a new expansion tank
had no sensors that came with it
Where did you get yours from and what is the part number please
matey, the warning light and check coolant message comes
on all the time now and is doing my head in
any help would be appreciated,
Cheers,
Damo

[McKay88]

I think what you need is a new expansion tank
1K0 121 407 A
as all i can see from the etka system is a plug connector to go into the expansion tank..
I am guessing though and am not 100% sure. £9.10 plus vat but prices will have changed so probable around the £15 mark inc vat

Hope this helps 

[Norbreck21a]

Did you get it sorted Damo ?

[damo666]

Did you get it sorted Damo ?

Not yet, been to and spoke to 4 different VW garages
and know one can shed any light on it or doesn't know lol
think I need the connector off the loom that plugs into
the coolant bottle, I asked if I needed the wires but again
the staff are not very helpfull

[Norbreck21a]

Damo,

Really can't understand what the problem is they are having ?

Here's the bottle with the connector shown



Here's the connector on the bottle



The corresponding connector from the car



and finally, the "sensor" inside the bottle (the 2 prongs) which comes compelte with the bottle on the part number I gave you




Dealers eh, why do they make it so hard  ?