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Not really! The actuator is there to control the airflow through the vents.
Do you mean for directing airflow to the different vents?
It is Likely a vacuum leak under dash leading to vents
where is the heater core in a 1992 Toyota previa
Not really, there's not much airflow when the furnace is not running.
Airflow improperly set (too high) or the most common undersized ducts.
A shingled roof requires ventilation. That can be done several ways. Gable vents, turbine vents, air hawks or ridge vent. It is also important that your soffits are vented to get proper airflow.
Mode switch is for the climate control. It allows you to direct the airflow from your feet, to the dash vents, defrost etc.
Make sure you have vacuum going into the cab from the intake manifold. (If you do and still no air, the problem is in the controler.
There is not a fuse that controls the air to your vents in your 2000 Toyota. The vents are controlled by blending doors. The doors open and close to direct air to the desired location.
Lack of airflow is a good bet, and can generally be repaired by the homeowner. verify that the filter is clean and installed and that the fan is working, check the inside coil and the outdoor condensing coil for cleanliness. if these don't pan out then a qualified service person will be neccesary.
air may not be getting directed to your vents, this happend with mine, its usually just a vaccum line that seems to every now and then just fall off....check under your hood for a vaccum like just hanging there and hook it back up. This should solve your problem