Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Two questions regarding 98 +8

Because the cooler water switches off the fan and then it heats up again. You must be just at that temperature.

Your thermostatic (otter ?) switch is too sensitive

Yes I think so.

Couldn’t agree more Andy, I had a John eagles chip fitted, also mulberry rad when the original failed shortly after I bought the car.
Never looked back.
BR
Rob

Any good?

http://www.gomog.com/allmorgan/electricindex.htm

Yes. Thanks for the link.

I am now working (slowly...) on some idéas on how to do what I want.
Right now my idea is this. The car originally had a heated windscreen. This is no longer the case. The windscreen has been changed.
But the switch for turning it on and off is still there: I hope to be able to use that switch, and the relay that belongs to it, to override the radiator thermal switch.

But to be able to do that, I have to locate that heated windscreen relay first. That requires a removal of the dashboard. That is now the next step.
I hope I can keep the forum informed of my progress here.

Guys, I am a little confused here? What several of you are typing about is by passing the temp sensor switch and there is mention of relays and switches that will carry the current involved (unless my head has messed up) there is only minimal current involved chaps as you are in effect bridging a SIGNAL wire not the high load feed wire.

If you were talking about switching direct feed to the motor then for sure you would be switching a high current feed but your not, your just talking about (and your spot on it is the correct way to do it) just putting an override switch into the signal wire that actuates the fan relay so all you need is a simple toggle switch.

I must have converted or supplied a mini harness for a dozen Morgan’s to do this and never had a problem or switch burn out. This however is not the case with later ECU controlled fans where great care should be exercised but fir the car under discussion all you need is 2 lengths of wire, a toggle switch, a few cable ties and a pair of piggy-back Lucar connectors. Takes about 30-45 min to complete the whole job. (Takes more time to mount the switch to be honest).

BR
Colin

As an aside looked up the term Otter switch as it seems to be regularly banded about. Not much directly on Google, but found that early contenders for controlling electric rad fans when they came on the scene, were a company called Otter Controls, which still exists. It seems they grabbed the market, notably being used on E types. Inevitably I suppose there is the association with the mammal as both live in water

Regarding the thermostatic switch, ideally there needs to be a temperature spread of a few degrees between contacts closing and opening again to avoid the regular cycling of fan.

and it was son of the founder, John Taylor who invented and patented the cordless kettle amongst many other things and was the designer/inventor of the Corpus clock at the library in Cambridge which bears his name.

Colin I completely agree I couldn't understand why the responses became so complicated it is such a simple job to do. Have had a bypass fan on my +8 wired as you describe for over 20 years with no issues what so ever.