Temperature gauge.

[DSW]

Temperature gauge goes up and down at times sometimes itstays at 90
For a few miles then drops to nothing and stays there but nowarning lights
Or tick over change, loss mode ect also no change to theheater temperature.
Any ideas ?

18t sport 2003

[Guest 2]

your engine would be helpful to know

[Crasher]

Fit a new coolant temperature sensor and if that does not work a new thermostat, both are cheap and easy to do. If these fail to cure it, you have my permission to panic...

[Google44]

I would say it is the coolant sensor. If It would be thermostat it would never go to 60 once it gets to 90. Try cleaning connector first.

[DSW]

connector was caked up and now working all ok.

[pauldazzle]

Coolant temp sensor it's notorious for failing. Replace with the revised green temp sensor, genuine VAG CTS only, & not a cheap pattern part.

[deano1978]

Mine was the same,very irratic mine did go to 90 and under,reved it hard mgt get to 90 but wld fall again.
Thermostat replaced...
all good now,constently @90 :-)

[Crasher]

To a great extent you can ignore what the modern VAG coolant temperature sensors say, they are hopelessly inaccurate, I think intentionally to stop people fretting.

[Geminslayer]

sticking thermostat