Quote:
Originally Posted by popstand
I have two coolant sensors - one a VDO sender (Summit) for temp gauge which has modern internals in an original Chevy appearing gauge, and the other came with the Painless 30102 cooling fan kit. Both are threaded into the intake.
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the right spot for a fan temp sensor is in the upper rad hose, because hot water goes in the bottom of the rad and cooled water is out the top. the fan should only come on if the water going back into the engine for cooling is hotter than the switch limit.
if it is in the intake and the thermostat is stuck it will turn the fan on but not cool the engine because the flow through the rad is stopped. for temp senders to the gauge and the computer, the intake is the right spot, but a fan switch should be past the thermostat in the upper hose or the rad top tank itself.
this is the kind of planning and redundancy for a fan system that I alluded the oems do but the driveway guy doesnt. I know the standard answer will be "never had a problem" and thats not my point. at the very least your fan will run a little more than it needs to, which is wear. at the worst, given a failure condition where the thermostat is stuck and the gauge sensor is inaccurate, the engine can run really hot and the driver could maybe open the hood to figure out why his fan is never shutting off, and get scalded by a blown hose.