Re: Heaters?
The knob on the switch should say Indirect-slow & fast, Off, Direct-slow & fast. Direct heat blows air through the core and out the front of the heater. Indirect is reverse and Should be for Defrost, and as Old Henry says, for indirect heat, as it will suck air through the core and blows it out the back side of the heater against the firewall.
Dave
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