All Things Mk5 > How to Guides / Troubleshooting

How to change your inline thermostats.

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Jamesf1010:
Hi there, I've just acquired a 2007 GTI a couple of months ago and been having the same issue with the temperature gauge dropping.

I had the main thermostat replaced by a garage last week but this hasn't resolved the issue. It generally takes a good while to heat up and usually falls back when on the motorway / over 50mph.

I have looked at the 'secret' climate control menu the past few drives and it tends to be sitting around 66-70 degrees Celsius. It has been up to the high eighties but that was after a decent drive then sitting stationery for a while.

My heating works ok and have looked through the other threads and can't really see what else might be causing it other than a second thermostat also needing changed? Would changing the sensors be likely fix this or any other ideas as to what it might be?

I'm taking it back to the garage this week for another test but apparently there weren't any faults showing up last time that would have indicated a problem here so not sure what the next step is.

Any other ideas would be much appreciated.

Cheers

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