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i'm driving home late at night when its really cold outside and all windows are closed (i think) .. anyways i notice that heat is coming in on top of my feet as if the air con was set to heat up my feet ... but its not ON ... climate control is OFF but heat air is coming onto my feet .. is this normal??

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You know what that is ???

when you have any temperature set other than the coldest, eg. 18 degrees, you are letting the water from your engine enter your heater core, which is the internal radiator used for your cabin fan...

so even though the fan isn't blowing the air through the heater core, there is still a lot of heat passing through the heater core in your cabin...hence higher cabin temperatures...

next time it happens, switch the fan on, close that valve (by switching the temp to cold) and then turn off the fan...and after a few seconds the heater core will cool off and you won't get any heat...

if you have high engine water temperature warnings, and you turned your heater on to hot, it is basically using 2 radiators to keep your engine water cool...

John Candy used that theory in Canon Ball...remember when he was racing with the BMW with that chick and the crazy truck guy was up his ass ?

He threw the heater on and the car picked up enough power for him to get away...

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