Coolant Temp Sensor

**gavsman** · 24-05-2011,08:47 AM

Hi Guys, My Coolant Temp sensor is intermitant ( fluctuates between 50 & 90 when car has been running for a while) , can someone tell me where this is located in the engine bay? hopefully will be able to get a new one & fit it at the weekend.

**arman123** · 24-05-2011,09:35 AM

Ok if you remove your air filter housing stand in front of the car on the air filter side look down behind the bulkhead and you will see it at the bottom make sure you don't brake the clip when taking it off and make sure you take the old o ring out too just get a new clip and o ring when you buy the temp sensor one tip is you could tie a string to the clip incase you drop it at the back of the engine removing the clip is the only tricky thing

**Whiskylad** · 25-05-2011,01:36 PM

My temp gauge usually sits about 75ish goes up to high 80s then drops back again. Plenty hot air from the heater altho the gauge drops back to under 70 when the heater is switched on.
The radiator fan appears to spin all the time, is this normal?

Only getting low 40's mpg and suspect the extra cooling is causing this.

Thermostat, temp sensor, fan fault or combination of them?

**gavsman** · 25-05-2011,01:42 PM

Not sure - After I noticed my gauge fluctuating I plugged VCDS lite into mine & it shows a fault for the Coolant Temp Sensor.

**arman123** · 25-05-2011,03:17 PM

Most Likley a coolant temp sensor try changing it if it does not do the trick thermostat lazy and cooling engine that needs changing but first try coolant temp sensor easy and cheap

**Whiskylad** · 25-05-2011,03:39 PM

Does faulty temp sensor also effect mpg?

**A4 Lad** · 28-05-2011,08:23 PM

I would try a stat indeed.

**fourringsrus** · 28-05-2011,10:14 PM

Is the plug in device on the bottom of the radiator the sensor/sender to the gauge/fans, as opposed to the items on the engine plumbing which send to the ecu

**Whiskylad** · 29-05-2011,01:02 AM

When I was doing this job I checked to see if there was water under the battery, there was so I reached in under the battery and removed a rubber 'plug' which is about 2 inches long and an inch wide. A lot of water gushed out, is this going to solve the problem or do I need to do something else. Is it ok to leave this plug out?

**Whiskylad** · 03-06-2011,07:34 PM

Just had thermostat changed and it's made no difference, the old thermostat was checked and was operating properly.

The guy said the water is not circulating round the engine, I had a new cambelt and waterpump fitted about 2 weeks ago. A dodgy pump by the sounds of it or something else? Help!!!!