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How to dismount 70s chevrolet ac control knobs

Supposedly these knobs are just mounted by pressure, so they should come out by applying pressure towards the outside, but they will not come out and I am afraid to damage the knobs.

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THE KNOBS DO JUST PUSH ON, BUT SOMETIMES THEY ARE STUCK. USE A SMALL PLASTIC SCRAPER BETWEEN THE KNOB AND FACE ,GENTLY PRY OFF WORKING YOUR WAY AROUND A LITTLE AT A TIME

Posted on Dec 09, 2014

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SOURCE: When trying to change the rear pads on a 2005

No, on rear wheel disc brakes, the pistons have to be turned in clockwise, and you need a special tool to do it, or you have something strong enough to put in the slots and turn it, but just turn them in far enough to get the new pads to slide over the rotors.

Posted on Nov 04, 2009

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Have a 2000 Silverado 1500 LS Pickup. AC works great; my husband turned the mode knobe and now I have NO AC coming out of my vents. AC only comes our of defrost vents.


Turn the mode knob back?
If that does not work, then perhaps the vacuum servo is going out.
Move the knob and check the vacuum at the lines to the servo.
If that is ok, than attach your own vaccum line, **** on it, and see if it moves and holds pressure. It is does not hold pressure or does not move, replace the servo.

Jun 25, 2011 | Chevrolet Silverado 1500 Cars & Trucks

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The dial that turns the air on for AC or heat is not working


I have the same issue, just started today. Any clues?

Jun 25, 2010 | 2004 Hyundai Santa Fe

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Do you have to dismount the engine to replace the clutch?


no i would usually just pull gearbox off with engine still on mountings

Mar 08, 2010 | 2001 BMW 330

1 Answer

Does the 2002 Dodge caravan have AC in the rear of the van? Or does it have just AC vents in the front of the Van.


If your van has rear AC/Heat there is a roof mounted control for the rear. There is also a control knob on the front panel, that says rear control auto, rear control & rear control off.

Jan 19, 2010 | 2002 Dodge Caravan

1 Answer

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

1 Answer

How do I replace the heater/AC control knob


Remove the instrument panel trim plate. Remove the HVAC control mounting screws, and pull the unit out untill you can get to the retainers. Remove the old knob, and install the new one. Reverse the above sequence and reassemble. When reinstalling, make sure that you didn't accidently loosen an electrical or vacuum connection.

Oct 07, 2009 | 2001 Pontiac Grand Prix

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

3 Answers

1991 Sierra GMC AC control problem


The follwing is a cut and paste from a service bulletin:

Bulletin No.: 461202

Date: May, 1994

SUBJECT:
A/C CONTROL HEAD FLASHES OR ERRATIC OPERATION OF A/C CONTROLS (POLISH
TERMINALS)

MODELS:
1988-94 CHEVROLET AND GMC TRUCK C/K MODELS
1990-94 CHEVROLET AND GMC TRUCK TOPKICK/KODIAK MODELS WITH C60 OR C69 AIR
CONDITIONING

CONDITION:

A/C Control Head flashes, performs erratically or malfunctions.

CAUSE:

Light surface corrosion on the Control Head terminals.

CORRECTION:

Remove the A/C Control Head and while holding the unit with the terminal
cavity down (toward the floor) so no particles will fall inside on the
circuit boards, polish the terminals on both sides of the cavity with a lead
pencil pink eraser. Do not use an ink eraser or other abrasive such as a
small wire brush or sandpaper, etc. Doing so will remove the terminal
coating and degrade the contact surface.

Performing this procedure, in many cases, will make replacing the Control
Head unnecessary. Using this procedure in conjunction with the A/C circuit
diagnosis found in the Electrical Diagnosis Manual and especially before
replacing a Control Head for any reason is recommended.

After polishing the Control Head terminals, but before reconnecting, check
for proper terminal contact as described in the applicable electrical
diagnosis manual. If contact is good, apply dielectric grease (P/N 12345579)
to the harness connector terminals. Please do not apply grease to the
Control Head.

Jun 29, 2009 | 1991 GMC Sierra

2 Answers

My a/c won't blow cold and heater doesnt get hot


Is the heater working? Turn the A.C. off with the car at an idle. Turn the A.C. on and listen for the compressor to turn on. (should hear a click under the hood and the motor should change pitch. If no noise, the compressor is not comming on. The o-rings were bad about leaking on these cars, letting out all the freeon. If there is no freeon, the low pressure switch won't let the compressor run.

May 20, 2009 | 1997 Ford Taurus

1 Answer

Tire Monitoring System


Most likely have a pressure sensor bad. Have you had the tires replaced recently? The sensors are easy to damage when mounting and dismounting tires.

Apr 29, 2009 | 2007 Chevrolet Tahoe

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