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exitwound's Avatar
 
Join Date: Oct 2003
Location: State College, PA
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Heater knobs and sliders confusing [86/944]

I've looked around here, rennlist, and clarks but i can't seem to figure out how these sliders work (if at all). Perhaps mine aren't working and that's why I can't figure 'em out.


To start, I may have a vacuum leak or a faulty heating system to begin with. I'm doing my research to find out why my heat constantly turns itself on, even when the knob #6 is turned all the way to the left. Also, I do not have a operator's manual, which is why I'm asking you.

Anyway, how are the sliders supposed to work? They're obviously not connected to anything mechanical directly and they don't seem to change anything when adjusted. I apparently don't even know if I have a footwell supply of air when it's on.

Where should I start?
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-Patrick
Black 1986 944
Old 10-26-2007, 02:09 PM
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Location: Westchester, NY
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To get you started, these sliders control damper motors. The bottom slider controls a motor and linkage just to the right of the gas pedal. The top slider controls one farther right and upwards. They only function when the ignition switch is on, or the car is running. You should be able to see the linkage move as you slide them from side to side.

The full heat problem could be your heater control valve, it is vacuum operated or could be just faulty. Don't know if you have seen it but there is a good write up in Clarks Garage Shop Manual under heater, heater malfunctions.
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Fred

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Old 10-27-2007, 07:46 AM
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Indeed. I have seen and read it and actually went looking for the linkage that often slips out. I wasn't able to deduce anything though from the few minutes I gandered at it. I shall look again shortly.

But basically, when moving the sliders I *should* see the linkages move?
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Black 1986 944
Old 10-27-2007, 04:21 PM
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The sliders basically control the amount of airflow to the defroster/ dash vents, and footwell area. As you move them to the right the airflow increases. Pretty simple operation.
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Vinny
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Old 10-27-2007, 06:27 PM
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Yes, when you move the sliders the linkages should move.
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Fred

'87 944S
'87 325 IS
'01 Grand Cherokee
'74 Kawi 750 H2
Old 10-27-2007, 06:42 PM
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I recently had a problem with my heater being stuck on.

It turned out to be my brake booster check valve which has a small vacuum port that is linked to the heater system. When wiping down the engine (as I always do when washing the car) I must have bumped and broke this small vacuum port.

You may have a similar vacuum problem as the vents are also vacuum controlled.

Vern
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Old 10-29-2007, 08:39 AM
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Heat always on can be heater clip near gas pedal (was for me). Couple of bucks.
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Old 10-29-2007, 03:51 PM
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FYI the heater control valve in the engine bay fails on full heat. so if you get nothing but heat all the time look at the controll valve on the rear of the motor.
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Old 10-29-2007, 04:13 PM
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Old 10-29-2007, 04:13 PM
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