No floor heat

[broncobilly_69]

I can't get my heater to blow heat out the floor vents. I just get heat out of the defroster when it's on mix and I get a little warm air out of the defrost vents when it's on floor as well. Near as I can tell it's a vacuum motor not working as I can hear the vacuum motor activate when I switch it to defrost. I've found 2 vacuum motors under the dash, one appears to be for defrost and the other for vent but I can't find the one for floor. Any tips on where to look or what else it might be? It just started happening all of a sudden, the selector knob for the heater function got some play in it at the same time so it could be in the switch too.

 

[Agnem]

When that happened to the Lady Moose, it was because my torching under the cab had melted a vacuum hose.



Aside from that, you've already done a good diagnosis. I would verify the vacuum motor is moving properly. If that is the case, then the blade has failed inside the box, which is probably NOT what you want to hear.

 

[broncobilly_69]

I couldn't find the vacuum motor that worked the floor blade. is it tucked up under the dash in a place where the dash has to be removed to see it?

 

[Willie Two]

Sending you a PM

 

[Willie Two]

On my 91 the system defaults to defrost if you lose all vacuum according to my service manual, maybe yours does to???

 

[broncobilly_69]

Vaacuum is good. The vacuum motors I found have vacuum and function properly. Vent and AC functions also work. Just nothing on the floor.

 

[65sixbanger]

I can barely feel anything blow out of my vents no matter what setting its on