temp gauge not working

[dam088888]

As above its stopped going to 90 only goes up a little bit is it thermostat or temp sender

[bullzeye]

Could it be the cold weather ? My car always sits perfectly at 90 were on motorway now and it's sitting below and is going even lower if I turn heater on hope it's cos it's -1.5

[dam088888]

Maybe not sure my guess would be temp sender not really sire tho

[dragongreengolfgti]

It should sit at 90 no matter what the temperature so if its going below its either the temp sensor somewhere in your water system (not sure where on mk4) or the thermostat is stuck open this could all be because of the cold weather. If its your temp sensor gone you should be able to feel lack of performance and also lower mpg slightly hope this helps

[dam088888]

Yes I do have lower mpg noticed that today just thought it was cis of the cold. Cheers ill get a new temp sender Monday

[daz veedub]

both cheap and easy fixes temp sensor and thermostat

[stevelfc]

mine does same had new genuine temp sensor and waterpump still does it so got be thermostat as goes up to 90 when parked up as soon as you start driving drops down again to cold 

[Wayne]

Temp sender or water pump in trouble.