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I've had some thoughts on thermal switches an their location

in the radiator. All the info I've ever seen with installation of thermal

switches for aftermarket/auxillary fans as well as stock installations have

had the temp sensor for the switch in the top tank of the radiator (or in

the thermostat housing).

It seems to me that the only time you want the fan running is when the

radiator can't do it's job unassisted - and that is when the *bottom* tank

will start heating up not the top. Do you get a faster reaction to a change

in temp in the head with putting the sensor in the top tank? Why have the

sensor in the top tank vs the bottom?

MearCat

I've had some thoughts on thermal switches an their location

in the radiator. All the info I've ever seen with installation of thermal

switches for aftermarket/auxillary fans as well as stock installations have

had the temp sensor for the switch in the top tank of the radiator (or in

the thermostat housing).

It seems to me that the only time you want the fan running is when the

radiator can't do it's job unassisted - and that is when the *bottom* tank

will start heating up not the top. Do you get a faster reaction to a change

in temp in the head with putting the sensor in the top tank? Why have the

sensor in the top tank vs the bottom?

MearCat

Remember that heat rises, so the water down the bottom of the tank will always be cooler and will also be the 'oldest' water in the tank (if that makes sense !!).

You've got a good point though.

J

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