Lotus 907

[Tigger7]

Anybody got any knowledge of the cooling system on a Lotus 907 engine. It doesn't seem to activate the electric fan even thought it is connected correctly.
The car is fitted with an electric pump but not sure if this is pumping right?
Any ideas?

cheers

[wedg1e]

Dunno how similar the 907 is to the 912 in cooling terms, but on my Esprit there's a temp switch in one of the steel coolant hoses. This triggers a relay (or two) down at the front of the car which in turn fire up the fan motors. There's also some trickery that puts a 'Fan Fail' light up on the dash if... er.... the fans fail...



You could try disconnecting the fan motor from the loom, then using a couple of lengths of wire to apply 12v directly to it to see if the motor actually is working (watch your fingers!)...


Ian

[Tigger7]

Ian,
Thanks for a reply. I have tested the fan and it works fine I just don't think the water is going around the system properly as it doesn't have a mechanical water pump hence I'm not sure if the electric pump is doing the job properly.

BTW: This engine is fitted to my Westfield! ??

[daxtojeiro]

Hi,
Ive read that the electric water pumps can be a pain, either flowing too much or not enough. Either way can cause problems, can you not fit the original pump back in to it? Also, I had an Excel a few years ago and the fan switch was mounted in a metal tube that sits in between the rad and engine, the switch was mounted on the top of the tube and it never worked right. I turned the tube so the switch was nearly at the bottom and it worked fine then. You need to get it sorted as those engines dont like overheating,
Phil

[annodomini2]

Do the pumps use AC or DC motors?

[wedg1e]

annodomini2 said:

Do the pumps use AC or DC motors?

Generally on cars, things are 12v DC...

Ian

[Tigger7]

It's a DC motor and I have no idea what it came from. Also as it's a very old motor, I'm not sure if I can still get the parts for it so I may be stuck witht the electric one :-(