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If the engine isn't really getting hot, you've eliminated a bunch of potential causes and you can likely concentrate on the fan controls and temp sensors.

But if your engine is truly getting hot there are a number of potential causes - clutch, brakes, low oil, fuel mixture, plugs, engine deposits, water pump, etc.

The thermostat opens and closes to keep the coolant within operating range. The thermostat starts opening at 136-144F (58-62C) and is fully open at about 167F (75C).

The fan doesn't come on until the coolant reaches between 212 and 230F(100-110C) and it will go off again at between 207-217(97-103C).

So, if your engine really is at 212 or so when the fan comes on, then you know the fan switches etc are working fine... but the thermostat may be faulty.

You can test the thermostat by removing it and suspending it in a clear pot of water, with a good thermometer suspended next to it. Increase the heat until you see the valve start opening - check the temperature... increase further until it is fully opened (about 8mm - I think)... check that temp...

If its within range, then you have something else causing the high temp problem, and there are a number of things that can do that.

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Posted by ski.dive

- March 16, 2010, 12:57:02 PM

I noticed my 1500 Drifter IS RUNNING HOT AND THE COOLING FAN IS NOT COMING ON.

I checked the FAN FUSE , it's GOOD.

What do I need to check, to get the fan to work?

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