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I just purchased this ‘94 CH613 yesterday and noticed the ac blower motor doesn’t blow very hard out of the dash vents and I’m sure that all it is is a clogged up heater/ac core since this truck used to pull a grain hopper. It will barely blow out of the defrost also. What’s the proper procedure and what dash pieces do i remove to wash these cores out to get the air flowing again? I’m surprised there is no information about this online anywhere and I was hoping someone here in the group might be able to share a little insight, Thank you! 

Edited by John Barnett
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https://www.bigmacktrucks.com/topic/75207-hvac-system-on-%E2%80%9894-ch613/
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The black plastic duct coming from the right side can be diss connected from the HVAC box, and carefully pryed open about an inch. I made a cardboard tube the fits aver a shop vac hose, then flattened the end, sealed with duct tape, then cut a small opening an inch back on one of the flat sides , and used it to vacuum the coil. 

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