Fan operation question

[Lord of Hog]

I used to know the answer to this but seem to have forgotten, so can someone remind me.

What should the fan be doing (running all the time / kicking in at a certain temperature / doing something dependent on exterior temperature etc) 1/ when I have the aircon set to AUTO, and 2/ when it's set to ECON.

The vehicle is an X-plate 2.5 and has had a 2-speed fan with gold resistor in place of the original 3-speed for the last couple of years. I don't think there's anything wrong with it but the engine temperature does seem to fluctuate a lot more in urban use when the ECON setting is in use.

[SD1too]

It's a pleasure to have the opportunity to remind you Russell!

Originally Posted by Lord of Hog

What should the fan be doing (running all the time / kicking in at a certain temperature / doing something dependent on exterior temperature etc) 1/ when I have the aircon set to AUTO, and 2/ when it's set to ECON.

1) In AUTO mode the fan should be running continuously at slow speed except in very hot conditions when it will increase to the next highest speed.

2) In ECON mode the fan will run according to the coolant temperature. For the KV6 this is at 100˚C.

... the engine temperature does seem to fluctuate a lot more in urban use when the ECON setting is in use.

It will do. In AUTO mode, with the air conditioning running, the fan provides constant forced cooling to the condenser and the radiator. This means that when the car is stationary in traffic the coolant temperature will not rise to 100˚C. In ECON mode, it will.

I hope this helps. Please come back to me if anything is still unclear.

Simon

[Lord of Hog]

Many thanks Simon.

It peaks at 101° so it's doing what it should. Clearly some residual paranoia on my part after my camshaft end cap failure a couple of months ago.