Pontiac Problems? Ask a Mechanic for Answers ASAP
Hello, the best way to test it is going to be removing the control head and applying vacuum to the proper hose for the valve that moves the mode door. Removing the blower motor will not give access to any of the control valves. If you can let me know if it's manual or auto climate control I can give you info on removing the control head and the vacuum hose diagram from it to the vaucuum controls on the hvac box.
The control head is where you adjust temp, fan, vent, etc. Give me just a minute to reboot my computer and I'll provide those diagrams.
Removing the blower will give you some access to the evap core, there may be some trash in there since you mention the stuff coming out the vents.
Removing the control head is like replacing a radio in that you take off the trim panel then the unit. see below for that
Oonce the head is out you can use a hand helod vacuum pump and the chart below to test the vac pods that operate the air doors
To actually get to the vacuum actuators the whole dash has to come out unfortunately, see below
You also want o check for vacuum on the purple hose to the control head. If the check valve to the vacuum canister under the hood is bad it will not work properly
I sincerely ***** ***** the call prompt, I can't control it from my end
Usually the vacuum switch on the control head begins to leak and causes the doors not to operate properly.
Sounds good Tom, Look forward to hearing how things go.