I cannot get the heat on my 1985 300sd. If I turn on the defroster I get warm air at the windshield but the air is still cool coming out of the vents. Can someone offer some advise on this problem. Note this car has a kilma relay in the fuse box. Help please.

I am still cold. I need expert advise as to how to get some warm air out of my vents. The car is at 80 degrees c, still no warm air.

have you checked your monovalve? The diaphram rips and can allow cool coolant where hot should be, or something like that. But it happens to almost ALL these cars sooner or later

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1981 300SD 512k OM603