OK, you'll have two heater hoses running thru the firewall to your heater
core. Simply remove the hose clamps (these guys are the spring-type, super
easy to remove), and use a tapered-end sprayer on your garden hose (you
know, the real cheap brass ones). Stick the tapered end in one of the hoses
and let er rip! Then, reverse the direction of the flow, spraying water
into the other heater core hose.
You likely have ok heat from the vents as the heater isn't competing with
the A/C evaporator when in defrost mode.
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