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.
__________________
'86 C-30 dually, 454/tbh400
'73 K-20 350/350/205 (sold
)
I'm kinda like duct tape- no real purpose, but handy to have around.