Engine temp issue

[ALFAAA]

Hi guys.
problem with an Audi A4 2002 1.6 petrol

My engine temperature wont go past 50 so i thought it would be the engine coolant sensor (G62) which i changed today but it didn't fix the problem , i also noticed that the temperature actually does go up to 90 when idling , but as i start driving it slowly goes back down to 50.

Also heaters blow hot air when idling and the temp goes up , otherwise just warm when temp is down.

Would anyone know what the issue would be ?
seems like a very odd one since , it goes up when idle goes down when driving.

All help appreciated.

Thanks.

 

[pauldazzle]

Stuck thermostat.

 

[Mike_B]

What paul said ^

 

[docurley]

Agreed

 

[Mike.M]

As mentioned and when was it last changed if ever.

I had this happen to me but the part had been changed a few months previous......... and when I took my stat out i noticed that one of the locating prongs had broken off and got trapped as the stat was closing and then it never allowed the car to keep a high temperature.

Bolied it on the hob to open it up and release the part and it has been perfect ever since.

 

[Rhencullen1989]

Thermostat or water pump, don't bother with eBay rubbish, if the thermostat is the same as my 1.8T then it's not a 5 minute job, and you certainly don't want to be doing it twice.

The water pumps run a plastic impeller which either breaks up or spins on the shaft, always replace water pump with cam belt.