False low coolant error.

[Johnbu]

I've had a few False low coolant warning during cold mornings.

A restart of the engine will disable the warning.

Coolant when cold is between min and max.

How do you fix it?

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[Umai Naa!!]

Definitely low coolant warning, or the frost warning?

[Johnbu]

Definately, with a stop engine warning too.

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[BeigeJet]

Had this also but not on cold mornings.

Traced to a faulty sensor in the expansion tank.

Because of the way things are made today, had to replace the whole tank.

I cannot find the invoice but did happen about 5-6 years ago when the Jetta was in a novated lease. No problems since.

[Umai Naa!!]

The expansion tank isn't that expensive.

[VRSJas]

Over time gunk builds up on the sensor. I have the same problem in my Occy on cold mornings.
If you can get in and clean the sensor with a tooth brush

[Johnbu]

Thanks,

I'll try to clean the sensors this weekend.

Warning only occurs during very cold mornings.

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[BeigeJet]

The expansion tank isn't that expensive.

That was my recollection.

I have found the invoice for the new expansion tank.

At the time the Jetta was 4 1/2 years old, replaced the tank at 120,000km service. Trade price on the invoice listed as $37.45 exc GST. This was in Apr 2011.

Given the failure at this time and distance and the fact the car was serviced every 15,000km at the original dealership while novated, I can only presume that it wasn't gunk related.