On my 126 the defrost is always on max blower and heat when selected. When set for economy heat the leg room vents are open and there is a small flow of air to the defrost, at the selected heat temperature.
If you do not have any warm air flow to the defrost area when in the heat mode there may be a problem with the vacuum pods in the heater.
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1984 300SD turbo 126
"My true love"
God made me an atheist and who am I to question His wisdom
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