Question about 1987 Suzuki Samurai

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Heater in a 95 bronco

When you move the control knob from defrost to floor all i hear is a hissing sound behind the heater controls

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  • Suzuki Master
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Sounds like a vacuum line off or at least leaking from split or something. Try to get in there and listen & locate, so you can replace/repair it.

Posted on Jan 04, 2009

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When I turn off engine, why do I hear a clicking sound from under dash?


HI THE CLICKING SOUND IS PROBABLY A HEATER/AC ACTUATOR WITH A STRIPPED GEAR , WHEN THIS HAPPENS TRY TO MOVE THE HEATER CONTROL KNOB FOR THE MODES (DEFROST/FLOOR/VENTS) SEE IF NOISE CHANGES . IF IT DOSE THEN THE ISSUE IS WITH A ACTUATOR UNDER THE DASH

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Why wont my 2001 ford windstar blow out of vents ? only on defrost?


Air Flow Control
Air flow control is accomplished in the following manner:
  • Primary control is through the function selector knob , mounted on the heater function selector switch, which is part of the heater control .
  • The function selector knob has the following positions: OFF, PANEL, PANEL/FLOOR, FLOOR, FLOOR/DEFROST and DEFROST.
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  • An internal single-pole electrical switch is also controlled by the selector. The switch controls the electrical supply to the heater blower motor switch (18578) .
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2002 Silverado wont change from defrost to floor


either the heater control or the lil motor that adjusts the door is shot.
i believe the motor is on top of the heater box behind the radio for the vent function there is also a blend door motor on the side (hot to cold) of the heater box.unplug the vent motor cycle the defrost/ floor knob and test for power . no power bad heater control .power present bad vent door motor. auto wreckers are the best place for these parts (cheapest) some will also test/ install

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I have a 97 Ford Expedition the heater motor is blowing the thermostat checks out good what is my next step to find out why I'm not getting any heat


A couple of things to check. your temp selector lever, knob from cold to hot. make sure it is moving the selector and opening to let hot water into the core.. Check listen for vacuum leak and move the controls for defroster floor etc. and listen to see if they are actuating ..these are usually vacuum operated but some are cables that get stuck at the heater temp valve. Hope this helps mike

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What part controls switching air/heat from defrost to bi-level to floor & where is it located?


In the attached drawing, Part 32 moves Part 26 to direct the air flow to the desired locations. It uses vacuum to operate. The actuator may be bad or the vacuum hose my have come loose when the heater core was changed. With the car running but the blower off stick your head up under the dash on the passenger side and see if you hear a hissing sound. If so it's probably just a vacuum hose come off.
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1 Answer

Hearter temp control was blowing too hot, now only blows cold


Clicking sound you hear is the worn brushes in your blower motor. At this point the blower moter may or may not start with the switch. THe blower motor is faulty so I would change that first, then check for vacuum leaks or faulty selector cable for the heat blend door. It could have came off door side or heater control side.

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Heater/AC vent option knob produces knocking sound in back right corner. i.e. the knob rotates from vents in front to half front half floor to all floor to half floor half defrost to all defrost. the...


If I am reading correctly you are hearing the vent doors moving to redirect the airflow to the vents you choose. This is normal and can be more noticeable if the blower fan is on, putting air pressure against the doors.

Jan 09, 2010 | 2003 Chevrolet TrailBlazer

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I have a 95 eagle talon 2.0L 5 speed. heater problems


You may have a vaccume leak that is keeping your duct doors open in the center of its travel. If you have knobs you may have a broken control cable. See if you hear a hissing noise behind the dash. That will get you moving in the right direction. Wish you luck!

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My air conditioner/heater level adjustment switch wont move


Check all vacuum lines under the hood. Just had the same problem. It was a vacuum line cracked on top of the engine. Wiggle thme around with the engine running, and listen for a hissing sound. If it's near the end, just cut it off and re-install.

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