79 CJ5 heater issue

[Ralf]

Hi guys, I'm new to this site.
Am getting cold air out of the floor heater vent on passenger side only.
Driver's side delivers hot air. Defrosters deliver hot air on both driver side and passenger side. I'm baffled, any clues?
Also what is the 90 degree elbow open ended hose coming out of the firewall at heater location for?

 

[mylittlecj5]

Hi guys, I'm new to this site.
Am getting cold air out of the floor heater vent on passenger side only.
Driver's side delivers hot air. Defrosters deliver hot air on both driver side and passenger side. I'm baffled, any clues?
Its probably got leaves or something blocking the air flow out the passenger side. Remove the box and clean it out.

Also what is the 90 degree elbow open ended hose coming out of the firewall at heater location for?

That is the cowl vent drain hose. Make sure it isn't plugged.

 

[Ralf]

Thanks for the quick feedback. Removing the heater box doesn't look easy.
I can see some lower screws, but no uppers.
Is the unit one piece or two? Anyone got a diagram or picture?

 

[CJ]

It's actually pretty easy, remove cables, heater hoses, the few duct work clamps and un-bolt it. Upper studs (screws) should be sticking out of the firewall into the engine compartment.

 

[Niedhogg]

I'm guessing a rat nest... Little bastards get in everywhere...