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Why is my 2003 trailblazer stalling while idle and heater is on?
If defrost is on it could be your compressor going bad. See what happens when you leave off defrost or disconnect your compressor. It only controls defrost and air conditioning. I had the same problem
Why would the heater switch not change off of defrost position on a 2000 S10?
You have a vacuum line disconnected probably under the hood. The HVAC controls are operated by vacuum and when there is no vacuum it system goes into defrost mode.
Why wont your heater change from feet to defrost but blows out hot air still?
most likely your heater controls run via vacuum lines. cracked or broken lines could cause this.
My defrost fan is blowing but will not defrost my windows?
That means either you have air in your heater core or your heater core is being bypassed
1991 Chevy G20 van- Why won't airconditioning blow out of dash vents instead of defrost and heat vents?
I had a Chevy van of this vintage and I found a vacum hose leak in the controls that would make the heater/defrost door default too defrost open. lisining carefully under dash or under hood may pinpoint leak. I had a Chevy van of this vintage and I found a vacum hose leak in the controls that would make the heater/defrost door default too defrost open. lisining carefully under dash or under hood may pinpoint leak.
Why wont my wrangler heater change vents from defrost to panel?
Check that the linkage that controls the damper is connected and working. The linkage is just above the gas pedal.
Where is the switch to turn your heated exterior mirrors on on your 2005 Ford Explorer?
Push the rear window defrost button , located with your heater controls , that also heats your exterior mirrors
How do you read the fault codes displayed on a 1992 Cadillac Eldorado?
press n hold the off and warmer buttons on heater controls while key is on
Why would the air conditioning only blow air from the defrost and floor vents and not the dash vents?
I would think that is a vacuum or a linkage problem with the heater control assembly (where all the buttons/slides are for changing between floor/defrost/vent) Had a diaphragm go bad on one once, and in a jeep cherokee, a slight collision with a guard rail knocked a vac line off for the vent controls, and ac only worked from defroster.
What could be causing your heater controls not to change from vent to defrost etc?
Don't know what vehicle you have but most HVAC controls operate from a vacuum supply from the engine. I would start with checking the vacuum supply connections under the hood. They could be cracked or disconnected.
Heater and ac only blows on defrost?
Many cars use engine vacuum to operate HVAC controls. If vacuum is cut off the system defaults to the defrost mode. Check the HVAC vacuum supply hose under the hood leading from the engine. It may be disconnected or damaged.
How do you fix the climate control selection on a Ford Windstar?
If you can turn on the heater but only cold air comes out you should check the blend door. It controls the door to switch from cold air to hot. It sits directly behind the heater/AC controls. It is white square plastic piece (approx 3in x 5in half inch thick and has a plastic screw rod that attaches to the heater/AC controls and they strip out.AnswerIt could also be referring to being stuck on defrost vents...See "Related Questions" for extensive information about changing the temperature blend door actuator motor and defrost only problems
