So, I was driving my 240 home in the ice (!) today and since this is one of the first actual cold days, I noticed my heater was not doing a spectacular job. The air felt warm enough considering the engine wasn't warmed fully, but the blower is weak. Just not a whole lot of air comes out of any vent. My heater controls are all manual, both heater cores on full, blower on full. I can hear the blower and it sounds fine. Ice was formed on the intake cowls some, but even without the ice it never does blow very strong at all. Do these cars just have wimpy blowers? And is there any intake for air on the interior of the car? What should I be looking for? Thanks in advance.

Also: My engine won't really warm up in the cold just driving around town. Is blocking part or all of the radiator a good idea? I know that is a semi-common diesel practice, but what kind of temperatures are measures like that applicable? It's only 28F here today, not super cold.

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'79 240D 4 speed manual 105k miles

If you have an A/C knob, turning it on just slightly will blow air full blast through the dash vents.

It is so weak because alot of it is blowing through the floor vents on the heat setting.