Cooling fans

[RossMac]

Need a bit of help to understand the Chim.

Bible states that the coolings fans use the ignition supply, so when the engine is off, the fan stops.

Surely this can't be good for the engine, if you don't hang about waiting in the car with the ignition engaged until the temp drops and the fans stop (as I am doing frequently after arriving home).

Is this normal?

[the dodger]

Would you rather have a flat battery?

The electrical system load is not calculated to have fan run-on. But I know lots of people who have had the mod done. There is a kit recommended by lots marketed by mod-wise which includes half-speed fans too. He posts on here.

[N17 TVR]

Ross, have a look at the Mod Wise adjustable dual speed fan kit (you should be able to find plenty of info on it if you search Chimaera / Griff forums).

I have it fitted on mine with it wired up to provide run on after ignition off.

I have never had a flat battery as a result..........

>> Edited by N17 TVR on Thursday 15th April 08:07

[R&J]

IMO once the engine has been turned off, the fans if still running, will only cool the water in the radiator as it isn't circulating.

If the fan switch is somewhere other that the rad, flat batteries will surely arrive.

further explinations appreciated if I've just written a load of Bks

Rich

[shpub]

There is a school of thought that it helps cool the underbonnet air space so that cooler air will be available when the engine is next used i.e. off a sprint starting line.

Might be worth doing for this but to be really effective you need to add an electric water pump to circulate the water and probably remove the stat so that this doesn't block the flow. This will cool the engine which then means you may have to wait a bit longer for it to get back upto temperature. The hot and cold cycling is not that good for the engine.

To be honest apart from the underbonnet cooling to ensure cold air from the start, not totally convinced it is worth bothering with on a standard car.

[greenv8s]

I've got an EWP/fan run-on system in the V8S, and it is certainly very effective at controlling heat soak in hot conditions, but I agree with Steve this is overkill for most people.