Cooling Fan runs all the time...

[Stenasev]

As title really. Runs down for about ten seconds after ignition off too.

Had the car about eight months. Have done more tinkering than driving so far I'm pretty sure it was off when I bought it and I think it started playing up after I started playing with PP2000

Could I have messed with something or is it coincidental? Have been over PP2000 settings several times but they appear correct as far as I can tell. The fan relay is fine. It's a 2003 2.2HDi with the single blade (2 speed I think) fan. Only ever seems to run at high speed though. Temp gauge works OK in case that is relevant?

It doesn't bother me too much as I can leave it unplugged as necessary but having done a load of jobs would like to get this one done too. (And the water leak but that's another thread!)

Cheers,

Steve

[scoopeydiesel]

Probably temperature sender switch. I had a similar issue with a D8 and replaced the switches. They should be easy enough to find where the water pipes come up into the engine.

[Stenasev]

Probably temperature sender switch. I had a similar issue with a D8 and replaced the switches. They should be easy enough to find where the water pipes come up into the engine.

Thanks for reply. I will investigate a little further. I didn't think it would be the sensor because I thought (rightly or wrongly) that if the temperature gauge was working correctly then the sensor must be too?

Cheers

[steve_earwig]

There are two sensors, one for the gauge and one for the ecu. I think the brown one is what you're after, the fan should run full tilt with it disconnected.

[Doggy]

There are two sensors, one for the gauge and one for the ecu. I think the brown one is what you're after, the fan should run full tilt with it disconnected.

The OP has a late full-mux 2.2HDi, which I thought only has the one sensor?

Be good to know - my fan's fine but I get erratic behaviour from the gauge sometimes.

[steve_earwig]

I'm pretty sure it's 2 sensors on a full-mux HDi, 3 on a semi-,

Just firing up Sedre... Ah, the connector on the engine CTS is green. Air con sensor is black. Ah bollocks, the temperature gauge sender is also the green one, another theory bites the dust and we're back to square one. Arse.

[Doggy]

Not to worry. Come to think of it, the only time I ever hear the fan running on a 2.2 is during an ecu download.

I did get mine to start eventually after refilling the cooling system, but I had to shut the bonnet and let it idle for an hour on a hot day.

[steve_earwig]

It doesn't help the OP though. Now it's looking like it could be anything other than the sensor, pressostat, relay in the engine fuse panel, ecu or even the fan itself. Arse.

[steve_earwig]

Oh, and my memory is definitely on the blink too.

[Stenasev]

Thanks for all your efforts guys. Just for the record the aircon is working well.

[Doggy]

Well at leas t that's good news. Probably not relevant but FWIW the fan does not automatically run on later cars when the aircon's on.

[gumby6371]

Just thinking out loud so to speak....would a naff internal temp sensor in the courtesy light fool the AC in to running flat out and therefore keeping the fan running?

[Stenasev]

Thanks again everyone for all your input.

I have a confession to make however... I have been a dimwit.

I had the fan option in PP2000 set as 2 or 3 speed fan (because I thought it WAS a 2 speed fan). Anyway should have set it as 'controlled by chopper'.
Working properly straight away now. Off when engine started whether aircon on or not. Pulled the temp sensor plug and on it comes.

Another job crossed off the list.

Can post with my next problem now...

Cheers all and sorry

[gumby6371]

We've all been there whether we admit it or not, at least on this forum nobody takes the piss!!!

[Doggy]

Come to think of it, life was simpler when it was pretty much all controlled by one's chopper.

Good to hear you've got it sorted.