Way back in the year of 2000, I purchased an 1988 Winnebago...... The front fire wall leaked air like it was a screen door.. Very cold to drive in the winter time. which we did
But after looking and seeing all the little holes for wires / cables etc
I sprayed the firewall from the engine side mostly and that cut the air flow way down. then I sprayed the area's I could see under the dash. Plus the corners where the firewall met up to the sides .
It wasn't a total success but it sure cut down the air flow coming in....... "Great Stuff" Insulation in a spray can....
might want to give it a try..
GREAT STUFF 16 oz. Gaps and Cracks Insulating Foam Sealant
Model # 162848 Internet # 100003351 Store SKU # 507765
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