Just wondering how the heat selector sends signal to the valve ( or whatever gizmo changes heat to cool) works in an International 9400.
I had no heat in the cab today (the taps are all on under the hood). So I took the dash apart at the fan speed/ heat selection. There are no wires or cables on the heat switch. So how does it actually change the heat setting?
I tried the bunk heater and it works perfect, so somewhere something is not opening up.
Thanks for any input.
2003 International 9400I with no heat in the cab
Discussion in 'Trucks [ Eighteen Wheelers ]' started by bulldozerbert, Sep 16, 2009.
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The heater box under the passenger seat will have the hot/cold selector flap. These are common for warping over the course of time and getting jammed. The driver controls send and electrical signal to a stepper motor under the seat that moves the flapper. Diagnostics are pretty simple. remove passenger seat. remove heater cover. inspect flapper, operate controls, see what happens. If the flapper is warped you will be able to see that. When operating the controls the motor should struggle to move it. If nothing happens, then either the control head or the motor is dead.
bulldozerbert and rookietrucker Thank this. -
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had the mechanic look into this. said the flapper was the trouble.
Good diagnostics. What is your fee?? -
FYI the "hot/cold selector flap" is generally called a blend door and the stepper motor that controls it is called a blend door motor.
bulldozerbert Thanks this. -
I just drive the truck, and you must obviously work on them.
I at least did not call them "thing-a-ma-jiggy" and "what-ch-a-ma call it" -
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So what if when you move the controller nothing happens would the controller be dead and we have to replace that my husband's heat went out today he's taking the seat off who put a new motor the heater motor in last winter and when he goes to turn it on on the switch nothing happens
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What is the actual problem? No blower or just no heat?
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