Brought the car test drove it went lovely came back opened the bonnet noticed the fan was running thought nothing of it
Just wondering after reading a few links is one of the main reasons because the thermostat needs changing ? It's a XJ executive 2002
Never went above half temp
And is it worth doing the water pump at the same time
Dan

 

Meant to say staying bloody spell check

 

Meter your temperature switch with the vehicle off and cold. You shouldn't have a continuity, and if you do, there's your culprit.

 

Ok thanks will have a look at that

 

Reading other bits on the website it wouldn't be because the water pump or thermostat is faulty
Dan

 

Definitely not saying it is, but it doesn't hurt to meter it to eliminate it as a possibility.

 

highhorse I totally agree it's just nerve racking when u pick a car up find the fans running and see all the horror stories
will start with the cheapest item first like u said and go from there

 

Mine was doing that until I put in a new thermostat !

 

The title of the thread suggests the fan runs as soon as you start the engine. If that is true, is the AC on?

Or do you mean the fan runs for a short time after the engine is shut off? My XK8 does that, but it's part of the ECU programming if the engine is up to operating temp.

 

Thanks Ron Brooke's got it booked in for a new thermostat and have a new water pump as well just in case

 

thanks rj237
the fans come on as soon as you start the car slow and as soon as the temperature come off of cole there on full power they turn off as soon as u turn the car off

i think the thermostat has had it so having one fitted Thursday as well as a new water pump if needed and thermostat sensor as well so I know it's all ok

will let u know how it all gos

 

Can also be a faulty sensor. Mine was thought to be dieing but it wasn't. Fitted a new one and the fan was on on a cold engine... Cold engine doesn't need cooling...

 

Mia that the thermostat sensor ??
ifso have another one of those to go in as well so fingers crossed I should have a lovely running engine with no fans running Friday

 

Near the thermpstat cover... On the crossover pipe infront... Should habe a grey plug...

 

Well good news on the fans staying on turns out to be faulty air con switch it's been unplugged and fans are all sorted so now to buy a new switch