With the non-AC heater, the centre vents only have unheated outside air. Turn them off with the wheel to get more air to the other vents, which blow heated air. The two temperature knobs (One each for driver and passenger) should be set at the desired cabin temperature, and a system of temperature sensors regulates it from there.

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'96 W124 E280T

Well if this is the case I will feel like a moron! At least I'll be a warm moron though .

I'm off to play with th vents and see if I can get the center ones shut off.

It blows cold air on my feet too - does that sound right?

Er, no.

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'96 W124 E280T

What I meant is does that vent get shut off as well? I know it's not right to have cold air blasting at my feet.

The center vent was broken, it wouldn't close - I had to take it apart and manually close it, I'll have to try to track down a replacement vent from a wrecker...

It's vastly improved now with the center vent forced shut, however it does still blow cold air on my feet and the heat from the side vents seems 'diluted' now for lack of a better word.

So for clarity there should be no heat from the center vents, only from the outside vents. The center vent should be opened for fresh cool/cold air when desired. (no AC)

One step closer now, thanks!