I have a lot of heat going throught the heater core on my 95 jimmy, the problem is when I go from cold to hot the air flow decreases dramatically. The blower fan is new. Is there something I can pour down to clean the air side of the heater core?
Thanks

 

No.

Hmmmm .. leaves?

Thought. Remove blower if easy. Set for air out to easily accessible ducts. Block ones you cant get to. Slick leaf blower or High power shop vac to duct to reverse flush the debris

 

I was thinking the same thing. I have a shop vac and will try reverse flowair to see if will blow anything out. Thanks for your reply pettyfog.