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[richardirv]

Noticed this happening over a few weeks, temp goes sky high then steadily comes back down to normal. Well now its just high all the time!! Usually between 49 & 56 ish. Thing is its also making the heaters not work right, can only get heat if its on High setting, blows coldish when on like 25-28.

[Gaffers]

Sounds like the sensor is either on its way out or there is some corrosion around the connections.  Have a look (behind the bumper I think)  A replacement one is not that much, I had a problem with a veccy one and replaced it with one off ebay and it worked fine...

[The Barge Captain]

Genuine sensor around £5 on TC.

I dont belive this has any control over climate.  That is a seperate issue.  Have you tried resetting climate? ( off ang auto buttons together for 5 seconds I think)

[richardirv]

Hhmmm just assumed it was linked, will try resetting. a friend at vauxhall gonna get me a sensor tomorrow hopefully.

[bob.dent]

Almost certainly the temp sensor behind the front bumper, and yes it will affect your climate. Had a similar problem with mine although mine turned out to be a bad wiring connection on the sensor. Totally confused the climate control.

[Marks DTM Calib]

Genuine sensor around £5 on TC.

I dont belive this has any control over climate.  That is a seperate issue.  Have you tried resetting climate? ( off ang auto buttons together for 5 seconds I think)

Yes it does, the climate uses the external air temp to get a view on wht the incoming air temp is.

Hence, if it thinks the outside air is 30+deg then when the climate is on say 26deg, it cools it by default.

[GastronomicKleptomaniac]

Genuine sensor around £5 on TC.

I dont belive this has any control over climate.  That is a seperate issue.  Have you tried resetting climate? ( off ang auto buttons together for 5 seconds I think)

Yes it does, the climate uses the external air temp to get a view on wht the incoming air temp is.

Hence, if it thinks the outside air is 30+deg then when the climate is on say 26deg, it cools it by default.

 Odd... does that override the sampling fan?

[Marks DTM Calib]

Genuine sensor around £5 on TC.

I dont belive this has any control over climate.  That is a seperate issue.  Have you tried resetting climate? ( off ang auto buttons together for 5 seconds I think)

Yes it does, the climate uses the external air temp to get a view on wht the incoming air temp is.

Hence, if it thinks the outside air is 30+deg then when the climate is on say 26deg, it cools it by default.

 Odd... does that override the sampling fan?

It appears to....

[Danny]

driven through any shallow flood water lately?

thats what caused mine to do that

[omegaman2]

sensor cost me a 10 spot from dealer

[Taxi_Driver]

Genuine sensor around £5 on TC.

I dont belive this has any control over climate.  That is a seperate issue.  Have you tried resetting climate? ( off ang auto buttons together for 5 seconds I think)

Yes it does, the climate uses the external air temp to get a view on wht the incoming air temp is.

Hence, if it thinks the outside air is 30+deg then when the climate is on say 26deg, it cools it by default.

 Odd... does that override the sampling fan?

Yours is a facelift.......it doesnt have one.  

[GastronomicKleptomaniac]

Genuine sensor around £5 on TC.

I dont belive this has any control over climate.  That is a seperate issue.  Have you tried resetting climate? ( off ang auto buttons together for 5 seconds I think)

Yes it does, the climate uses the external air temp to get a view on wht the incoming air temp is.

Hence, if it thinks the outside air is 30+deg then when the climate is on say 26deg, it cools it by default.

 Odd... does that override the sampling fan?

Yours is a facelift.......it doesnt have one.  

*strokes chin* If I wasn't sitting here with a big tub of Milkybar icecream, I'd be out looking, I'd have swore blind I had one! But I trust you.

 *wonders if you can get stick-on sampling fan vents a la those fake sunroofs*