Peugeot 207 fan runs as soon as engine started

[ted1234]

Hi All, Just had full service (Monday) and new front brakes on my 2008 Peugeot 207SW.
I have used the same mechanic many times in the past.
He has gone on hoilday for 2 and a 1/2 weeks anI have a problem with my car.
The fan runs as soon is the engine is switched on which it never did before.
Is this something I could correct myself ?
Any help much appreciated.
Kind regards John

 

[Burnerman]

I may be barking up my wrong tree - as usual - but I think the cooling fan is ECU controlled......have you got the A/C switched off?
John

 

[ted1234]

Hmmmm, Thanks John.
will check in the morning.....Ta

 

[Roton600]

Sounds strange but check that the oil filler cap is fully tightened and not loose

 

[ted1234]

Hmmm, Apparently he is not on Holiday until Monday.
He came back and said at first the coolant temperature sensor was at fault as no temp showing on dash.
When I said temp WAS showing last night he said he took temp sensor out and cleaned it an it's ok now.
Although he told me to 'keep an eye on it' for the next few days if it 'goes' again he will come back.
(he dosent sound confident)
John

 

[Burnerman]

I think he is probably correct Ted - but more likely to be the electrical connections to the sensor, I think.
The temperature sensor develops a higher resistance the hotter it gets, turning the fan on. So, if the connections were faulty, the resistance would be high or infinite, doing the same thing.
Keep an eye on it
John

 

[ted1234]

Thanks John, I have been so busy with work etc that I havent even started the car yet.
Will keep an eye on it though.
Ted