tommo9375

iTrader: (7)

I've got a problem someone might be able to help me with ; When the car is idiling the temp gauge goes up to half way but i've left it running a while and the fan doesn't come on,in the past week or so when driving the car the temp needle returns to near the bottom of the gauge on the dash ,but on idle it goes to half way.I've ordered an ECU Water temp sensor so going to change it but i'm unsure of it's location .Is it underneath the intercooler somewhere ? I've checked for codes on the ECU but there aren't any . Help with this would be appreciated.

mit

iTrader: (10)

Hi, the ecu temp sensor has nothing to do with your temp gauge, there's a second sensor in the water cross feed pipe for this.
Both the sensors sit in the same pipe, it's between the throttle body and turbo.
Sounds like your thermostat may be seized open, and the wind through the rad when driving is causing the water temps to drop off in the cold weather were having.

Tucker82

iTrader: (7)

under the inlet manifold by the turbo. There are 2 sensors side by side. Its the bigger of the two. Red/brown plug (im colourblind!)

Its a bit fiddly

tommo9375

iTrader: (7)

Cheers for the info ,can i remove the sensor and free it up or do i have to get a new one,ecu sensor already ordered so be aswell replace it at the same time.Wouldn't the ECU sensor signal make the fan run once it came up to a certain temperature,my fanisn't kicking in at all ,but does work when you connect the 2 green plugs together under the steering column.

mit

iTrader: (10)

No, new thermostat, they're quite cheap. It sits in the water pump, at the large water pipe that goes to the bottom of the rad, battery side. It does mean dumping your coolant.

tommo9375

iTrader: (7)

Looks like i'll have to dump the system then -never mind do you know the best place to get one of these sensors as i can only seem to find the ECU ones?

tommo9375

iTrader: (7)

You said in the post at the start that the sensors are next to each other ?

Both the sensors sit in the same pipe, it's between the throttle body and turbo.-or is it on the other side.Sorry never had any experience with this problem before so trying to do it myself rather than pay someone else.

mit

iTrader: (10)

The thermostat's not a sensor, it's a valve that opens when your water comes up to temp to allowing it to pass through the rad, which is at the bottom passenger side.
The ecu and temp gauge sensors are on top of the engine, in a alloy water pipe, see this pic, where the ring is. It's under all the pipes, a bit tricky to get too.

Hope this helps

joz8968

iTrader: (13)

See here for the CTS on you car:-

https://www.scoobynet.com/general-te...re-sensor.html


Here's a pic (on it's side!) showing the coolant x-over pipe over the top of the block with the CTS (big sensor) and the smaller sensor for the water temp gauge next to it. Obviously this is showing it with the IM and ancillaies removed:-

joz8968

iTrader: (13)

Also OP, if you also change your stat then if your coolant is okay and less than 2 years old you can reuse it - just collect it in a suitable container for reinstating, after the new stat is fitted.....

tommo9375

iTrader: (7)

Thanks a lot for the info and pics you've been very helpful .