I82much, one thing you can do, if you ever take the heater box out, is to clean the old foam off the air blend door(this door moves when you adjust the heat slider) and replace with new foam. This helps the door seal better when your HVAC control is at full cold.
I will say that it’s not a very fun job since you have to take the fenderwell out and a bunch of butyl ribbon seal on both sides of the the firewall.
__________________
67 LeMans, 326, M20, 3.31 12 Bolt
|