Quote:
Originally Posted by leddzepp
If you want fresh air to come into the cab while running the heater in an aftermarket system, simply reach down and pull open the drivers side air vent in the kick panel. Fogging problem solved.
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I'll take that as a joke. 0 degree air blowing on my leg. That's what I want.
A complete flush is OK, but not absolutely necessary. The mineral oil will just lay in the lowest point.
Every unit has a separate core for heat and cool.
Outside air for our trucks comes from the cowl. Smooth the cowl, no vents.
The vacuum controlled vent door part of the fresh air/recirc source, but some or all of that fresh air is then routed through the heater core. How much air is heated is determined by the temp selector.