Cooling fan wiring.
 

I am confused. Again. In my haynes sierra manual it shows a thermostatic switch that gets fed from a relay that drives the fan. What I can't work out is where the switch is. It looks from the manual to be a dual switch, each switch element switches a single fan. I would only need one as my car will only have a single fan. Anyone got any guidance on this? I assume the two switches close at different temperatures?
I am concentrating on my cooling system now, I am waiting for a propshaft but want to get the cooling system fully done before it goes out for it's first drive.
Best and all that,
Enoch

Front of the thermostat housing on the left front of the engine.

Just wire up the one that switches first ( sorry don't know which pair that is)

TT

Thanks matey, I thought that was a sensor used by the ECU for some reason.
I will heat it up with a heat gun and see which comes on first and use that one.

You will need to get it over 110c IIRC..

The ECT for the ECU is a two pin device, craftily hidden round the side under tha manifold IIRC.. it should have the guage sender next to it ( a single threaded connector )

TT

I think you recall correctly. I just went and had another look. I am not going to run it again now until I have coolant in it so need to get on with my plumbing now. I am trying to figure out how to get video off my DV camcorder on to my pc so I can mail some footage of the engine running as it is and then my first trial run. Another thing to learn:)

Just as an update for anybody in the same position - the two black wires supply the two switches within the unit with +12. If you are running a single fan you can wire the other two wires together ( black / red and black / blue on my car) so the switches are in parallel. It does not matter which one closes first that way as either switch will turn the fan on. simplez.

Dam, thought you could tell me which goes 1st....

TT

Oh... If your running a twink, swap that switch for an escort deisel one ( sorry don't know exactly which ) as it's low cutin is lower than the twinky, less chance of overheating a small rad.


TT