Just purchased a 2000 F250 S/D 7.3L Diesel
I have heat but there is no air pressure blowing in the cab - a real problem in the morning trying to defrost the windshield and windows.
The truck is originally from Arizona and it is completely covered in reddish dirt/sand everywhere..... the heating fan blower motor was just replaced but still no air coming through (it does get warm - the temperature control works).
I took off the blower motor and i can see the heater core is completely clogged with Arizona dirt!!! I tried using a shop vac and stiff brush, but with very very limited success - if any!!
You're actually seeing the evaporator core, not the heater core.
You'll have to get it cleaned the way you've been going at it. Your only other choice would be to remove the core which means the dash has to be removed.
Stev
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