Blower motor moves air. That's it. Doesn't matter what is happening downstream. Vents and such direct the air. When you turn the fan on, doesn't matter where the vents are directed (aside from "Off"....), the fan should still run at the selected speed.

What exactly is the problem you are chasing here? Does air not blow out the defroster vents? Or, is it just not as warm as you think it should be?

 

Yes it does. Maybe the control switch is bad.

 

The ac clutch is supposed to run when on defrost it removes moisture from the air which helps dry the moisture that's on the windshield.

 

The brown vacuum line must play a roll in this. Need to find where it attaches. What type of work if any has been done recently?

 

None down there, I got my ac clutch replaced by a reputable family friend mechanic. I searched the fsm and according to the fsm it is the feet vents switch but I can not figure out where it goes and the fsm doesn't say.
My heat doesn't work at all, it comes out at about 75 degrees at the warmest.
Well I can't get the ac clutch to disengage with any moving of the *****. I don't think this matters though.

 

Oh and my fan works perfectly by switching between different speeds and blowing out plenty of air.

 

Because(i think) without that vac line attached, the system might think it's on AC. So does the blower motor work when on the heat setting? There is also a MODE DOOR ACTUATOR/ ,or HEAT/DEFROST DOOR ACTUATOR on page 24-26 of the manual, besides just the blend door.

 

Ok well, that was too easy to figure out. The brown vac line goes from the back of the controls on the dash, down to the silver canister on the driver side of HVAC box right next to the floor vents.

 

The brown vac line comes out the back of the control unit on dash , to a plug that has all of them. First pic. From there they go to different things, but the brown one connects to the back of silver actuator I mentioned previously. Second pic.

 

Oh it goes to the back of that?!?!? Thanks a millio zman, I was taking my bottom dash apart last weekend trying to find where it went, I knew it was close due to the length. I'm going to go plug that in now and see if it works! Thanks for that picture