ALWAYS HOT in the CAR - Toyota Yaris Forums

CTScott · 05-12-2010, 09:45 AM

The hot/cold knob simply moves a door (the Air Mix Damper Control) in the air box to adjust how much air blows over the heater core. In the picture below (which has the blower stack removed) you can see the Air Mix Damper Control cable, which is the lower one:

With the engine off, if you put your head down below the dash and rotate the knob, you should hear the damper gear train clicking and when you reach either end you should hear a thump from the air box. If you don't then either the cable is not properly connected, the gear train (which is part of the air box side of the control cable) is broken, or the flapper door is jammed.

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05-12-2010, 09:45 AM	#2
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	The hot/cold knob simply moves a door (the Air Mix Damper Control) in the air box to adjust how much air blows over the heater core. In the picture below (which has the blower stack removed) you can see the Air Mix Damper Control cable, which is the lower one: With the engine off, if you put your head down below the dash and rotate the knob, you should hear the damper gear train clicking and when you reach either end you should hear a thump from the air box. If you don't then either the cable is not properly connected, the gear train (which is part of the air box side of the control cable) is broken, or the flapper door is jammed.