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Re: 1969 C-10 Heater question
Removing the heater core to clean it will help. I would suggest flushing it out also. There are probably more leaves in the cowl area to be cleaned out. (We make up and install 1/4" hardware screes under the cowl to stop the leaf problem).
The round head bolts that you see are studs that have nuts on the outside, (underhood side of the firewall).
A service manual and assembly manual are nice books to have if you are going to work on your truck yourself as they contain a wealth of information.
Jim
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