[Jac2911]

Hello, I have a 1984 SJ50 Suzuki Sierra and I am having trouble getting the heater to work. I have cleaned the heater box out by drilling a hole in the side and vacuuming/blowing it out. It blows air really strong but only cold air. If I place my hand on the 2 demister tubes that come off either side of the heater box it feels hot there but there is nothing coming out of the vents. I know hot air only comes from the windscreen and feet vents but there is no hot air coming from them either. Also no matter what mode I put it on it only blows air out of the front vents. Any photos would be a massive help aswell. Thanks for any help in advance.

[Jezzer]

If you are only getting air flow out of the dash vents, I would say the direction flap is not moving.
Is there any tension on the slide lever?
It could be a broken cable or it’s just come off the flap.

Was the heater core just covered in leaf's etc or is it packed with mud?


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[Jac2911]

There is tension on the slider. Was only filled with leaves ect.