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Hello on my RSX my temp dial will turn freely but car only blows heat, even to turn knob down to let outside air in it always blows 90 degree heat..I have 2 extra control panels with the knobs in the dash and it doesn't matter which one I put in the heater is stuck on 90...what else should I check..I've heard of a resistor under the glove box..any help would be appreciated
 

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Forget about the resistor. That's for the blower motor speeds.

There is a valve that regulates coolant flow through the heater core and thereby the temperature. I believe it can be observed on the engine side of the firewall.
 
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