[bnoon]

Originally Posted by donut

Unless your ac is a completely separate system, you may be shooting yourself in the foot.
(blower works with the AC too )

Seems to me, in the old days, we'd find a way to kill the water to the heater core. Fan would still circulate the air, but no excess heat.

True, I'll probably bypass the heater core in summer too. I just hate that GM didn't have an OFF setting.