W124 Heating

[JohnSA]

I have a 1989 W124 200.The problrm is that no heat comes from the drivers footwell vent, although it does from the passengers.All other heater/aircon functions are normal.The car does not have climate control.What could be the problem & how do I fix it?

 

[bolide]

Google W124 Duovalve

Nick Froome

 

[Dieselman]

If it's just the footwell, it must be the direction flaps in the heater box are not operating correctly.

 

[JohnSA]

Thanks, but will cool air still come from the footwell and how do I access the heater box?My Haynes Manual isn't much help.

 

[horatio]

To get at the heater box would mean removing the dash! (the matrix is inside it). To be honest I would just live with it.

 

[JohnSA]

Thanks guys for all your suggestions. I also do not have warm air to the windscreen vent when selected from the drivers side. I am beginning to think duovalve?

 

[kth286]

duovalves normally fail in the hot air position, so nil cold air.

(always cold air from centre vents)