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Re: How to clean out air system?
Sounds like over the years you have accumulated leaves in the chamber behind your heater blower. Not likely you will have an easy fix getting access to the areas without getting deep. Anyone who has done some serious work on their cab has had that area needing attention. The screen idea will help prevent more unwanted guests but you really need to look seriously at getting deep into the area of where all the junk as accumulated over the past 50 years. Look at my pic in the far left where the fan blower n heater would be mounted. Most likely your debris is inside that area and is the culprit.
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