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Knob heater control fell off

Knob that controls the vents fell off and wont go back on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 124 Answers

SOURCE: heater control 98 chevy s10 blazer

These trucks have a problem where moisture builds up in the heater box then freezes. When this freezes and you change your heater settings it breaks the shaft for the blend door. If this is what happened you should be able to look under the dash above and to the right of the gas pedal and you will see two vaccuum accuators one of them you should be able to wiggle around the linkage if it is broke. To fix this you need to remove the entire dash to get the heater box out which involves discharging the AC and draining the coolant because the heater core and evaporator come out. Please rate.

Posted on Dec 13, 2008

longbow243
  • 103 Answers

SOURCE: 2002 suburban wont switch from vent to any other

It sounds like the mode actuator is defective. It is what changes the different modes, floof,vent,defroster.

Posted on Sep 09, 2009

  • 6 Answers

SOURCE: 2000 gmc sierra 1500 5.3 v8. a/c heater control problem

your heat/cool and vent selection options are controlled by engine vacuum through small clear tubes attached to the rear of your climate control interface. Other vehicles have small steel pull wires that operate the desired changes. You might try removing the trim and any fasteners affiliated with the interface/console. GENTLY pull outward and look to see if any of these tubes are pulled off or cut/damaged. Did anyone recently install a new stereo in the vehicle? If so, the vacuum tubing and or pull wires that change your outlets could have been damaged when the stereo unit was pushed into place. Hope this helps

Posted on Sep 09, 2009

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1 Answer

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.
  • The heater function selector switch combines a vacuum selector valve with an internal electrical switch.
  • The vacuum selector valve directs source vacuum to various vacuum control motors (18A318) . Refer to the System Airflow Schematic and Vacuum Control Charts.
  • 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) .
  • The position of the function selector knob determines the manner in which the system will operate.
  • Each position of the function selector knob is detented for positive engagement.
  • You probably have a vacuum leak , Pull heater control panel an check for vacuum . A broke vacuum hose or The vacuum selector valve is bad ! Or check for a vacuum hose in the engine compartment being off somewhere !

Mar 08, 2015 | 2001 Ford Windstar

1 Answer

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

Mar 07, 2015 | 2002 Chevrolet Silverado 1500

1 Answer

05 malibu heater vents blowing incorrectly


The are two controls on the heater. One is the blend door and that controls hot and cool, the other is the mode selector door and that changes the place air comes from. You should be able to see those and the area that controls the air in the plenum. The plenum is behind the glove box. Open the glove box all the way and see if the controls are visible. Activate the mode control to see if the lever moves on the plenum, the problem could be anything from a broken lever, bad control, loose control, or something that fell down the defrost vents.

Feb 20, 2014 | 2006 Chevrolet Malibu

1 Answer

Heater/ac control knob fell off, how to put it back on?


When I worked at the dealership I seen alot of these knobs crack and break and the metal retainer stay on the control shaft,you have to remove retainer and either puchase a new knobat the dealership or glue the retainer back in the knob.

Sep 26, 2009 | 1995 Chevrolet Monte Carlo

1 Answer

Heater works ok but wont send air thru defrost vents


check the control knob it may appear to be working but is not turning the actual controller

Jan 01, 2009 | 1995 Pontiac Grand Am

2 Answers

Heater only blows thru dashboard vents, won't defrost


chech cable on back of cluster dial some time pops of causing issue.

Jan 01, 2009 | 1995 Pontiac Grand Am

1 Answer

Grand am heater works ok but wont defrost


check cable behind dials rod most likely off on that dial.

Jan 01, 2009 | 1994 Pontiac Grand Am

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