Sometimes the HVAC vents on the dash of my truck will just randomly start blowing air out even when the right knob is in the off position. Its always only the dash vents and never the floor or defroster vents.
The speed of the air depends on which number the left knob is turned to and the air is warm or cool depending on where the center knob is turned to. I can turn the blower speed up or down and it changes the speed like it should if the vents were actually on.
Lately it seems that sometimes when I turn the position switch to the floor heat position nothing happens for a bit and then heat will come out.
Its sometimes getting harder to stop the vents from blowing air when its supposed to be off.
I would like to know what is causing this to happen because its rather annoying and Id like to stop it from happening.
If it’s set to floor then it’s on. Your left knob should be fan speed (1,2,3,4) center is temperature, and right side is position. The vent position needs to be set to off for it to be completely off. Some vehicles you have to put on recirculate also, to prevent air being forced into the cowl to blow through the vents.
Some of the moving parts under the dash might be hanging up. I see that every once in a while where I work. There is rarely a problem with the control panel on something as new as your truck in my experience. I would try and find the exploded view of the underdash components and see if you can check the different parts for proper operation.
your air box has trap doors in it that direct air and have foam tape that helps to seal the door’s when shut. the problem with yours is either the trap door doesn’t shut all the way due to a bad cable or acuator. OR the foam tape is missing/damaged/worn which is leading to a leak, which in turn means you are feeling air.
or it could be your blower motor resistor is bad if your truck has one
plus my car doesn’t blow air on me when i turn off the fan and i already have a supercharger on mine!
To me it doesnt seem like a leak because I can turn up the speed of the air coming out.
The blower speed knob is separate from the position knob (where off is). Im really thinking its electrical.
Can you try and explain that better it doesn’t really make sense? Does your “leak” seem to increase and decrease in volume/intensity with an increase in the speed of the blower motor. If so it’s probably a trap door hanging up. Please provide more detailed information.