All Things Mk5 > How to Guides / Troubleshooting

ripping my hair out on this one off issue please help

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LC5F:
Seem to recall they are the same part - but please check.
I am guessing it's the one at the front you have not done, it is not the easiest to get at, alternator off and under the intake manifold - I appreciate you have thrown a lot of money at this, but consider replacing the thermostat at the same time

Cizx:
Sounds like a good idea I’d rather not have to tear into this again I like to take the long way to ensure proper repair if that makes sense

pudding:
I could be wrong, but I believe the front temp sensor is for fuelling compensations, being in the water pump output flow, and the gearbox side one is for triggering the fans/dash temp gauge as it's the output from the radiator.

Is your car a DSG?  I believe they have an extra thermostat in the temp sensor housing, above the gearbox housing where LC5F mentioned.  Could this be stuck shut perhaps?  Manuals only have the main stat at the front.

Cizx:
It is I didn’t know that could that be an issue?

pudding:
In that case, I would personally replace that whole thermostat/temp sensor assembly.  If the secondary stat is jammed shut, the engine could get hot and bothered.  Why DSGs have 2 thermostats.....I couldn't tell you......either way, the engine is grumpy and needs cheering up with some fresh parts.

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