Advice. Cooling fan on.

[redcar]

Over the weekend the cooling fan appears to be perminatly on,it has not got an over ride switch, car has always run around 90C,fan normally cycles ok never had overheat problems. Just checked with cold engine and fan starts as soon as key turned on. Is it alright to have fan on all time as car is due to go into Austec in 4 weeks and I'll get them to sort.
Read bible and otter switch sounds a bitch to replace.
Any advice appreciated.

[wedg1e]

Yep, sounds like the Otter switch has failed closed. You could try clouting it if you can get a swing with a suitable blunt instrument.

Ian

[streaky]

I shouldn't worry for the next four weeks, the additional cooling might just drop the temperature a few degrees, but if the ambients are warm ...

Another thing to check/thump ... if your fan is powered through a relay, it could be that the contacts have welded shut.

If you're worried, just link in a cut-out switch.

Streaky

[HeyAndy]

Mine did that after I upgraded it. I left it on and everything's remained cool...I'm gonna fit an over ride anyway so it won't really matter.

[19560]

redcar said:

Read bible and otter switch sounds a bitch to replace. Any advice appreciated.

Well, it's not the easiest of things to replace. The factory welded the rad shut and fitted a threaded otter switch in the swan neck similar to the Griff to mine. They also mentioned that it was better to measure the water temp as it exits the cyl head.

[Ian V]

Stange that. The fan on my 400 has just done exactly the same. Was thinking of replacing the otter switch until I read the 'bible', now I think it will be an override switch instead.

[streaky]

19560 said:

The factory welded the rad shut and fitted a threaded otter switch in the swan neck similar to the Griff to mine. They also mentioned that it was better to measure the water temp as it exits the cyl head.

I don't see why. Surely, any need for additional cooling of the radiator is determined by the return temperature (and don't call me "Shirley"!) - Streaky

[redcar]

Thanks all, will leave till car back at Austec, as it is running cool.

[rev-erend]

Changing the switch is one mother of a job .. Austec won't thank you for that one..

Didn't they just do your rear wish bone / shocks and
the rear brakes ... all nasty jobs.

They will be cursing you

[redcar]

They will be cursing you [/quote]
Not as much as I'd be cursing me if I did it, besides teach them for crunching my car.

[dickymint]

Do away with it and fit a thermostat in the top hose.

[19560]

streaky said:

19560 said: The factory also mentioned that it was better to measure the water temp as it exits the cyl head. I don't see why. Surely, any need for additional cooling of the radiator is determined by the return temperature (and don't call me "Shirley"!) - Streaky

I see your view but that is what they said to me. It will give a better guide to the cyl head temp afterall. Presumably if the water temp is reduced by about the same amount for each circulation then this is also by implication a guide to measuring the temp through the rad.