Dont worry it is normal
That is a feature built in to the unit that keeps the ac pump lubricated during the winter months, it should only come on while in defrost mode.
I would not recommend disconnecting the air cond pump as it may not work at all when the warmer weather comes back.
Mode switch is for the climate control. It allows you to direct the airflow from your feet, to the dash vents, defrost etc.
The vacuum supply line from the engine is disconnected or broken. When the vacuum supply is cut off the system defaults to the defrost mode.
There is no A/C defrost relay. The defrost mode of the heating and air coditioning is a default mode whenever the system is not operating as it should. It automatically goes to defrost mode when the system is not operating as it should.
Hi, It is not the blend door, that is for heat/cold changes. The mode door could be the problem, or stuck defrost door.
defrost is the default mode. in most cases a vacuun leak is the culprit.
Loss of vacuum due to leak or bad vacuum caninster. Defrost is the default on this system and when vacuum drops it goes into default mode Check for leak either under hood or under dash area
where is the defrost actuators located
Not knowing what vehicle you have, many vehicles use a vacuum supplied by the engine to operate the different positions for the air to come out. When the vacuum is absent the system defaults to the defrost mode. I would check the vacuum supply hose starting at the engine for cracks, damage and disconnection.
where is the defrost actuators located
Yes, the defrost is supposed to run in A/C mode for better defrosting
If you turn on this mode, your airconditioner will turn on the max settings.
If you have it in the defroster mode, the AC pump will run. This is normal.