I need some help. I have a 93 bonnville and the heat sucks. the heat does come out hot but it doesnt blow strong at all. i have alrady replaced blower motor and checked the resinator also checked the switch inside i can use any help you have thank you.

my park ave had the exact problem, what i did was remove the blower motor, and scrub at the core, then use an air compressor to get as much crap out of the fins as possible..warning could make a mess of your interior so id recomend covering it with plastic.

There'* a procedure in Techinfo for cleaning the core.

Moving this to Mechanical and Maintenence 92-99.

http://www.bonnevilleclub.com/techinfo/?article=62

I imagine your A/C doesn't work either, and most commonly the problem is that the evaporator sprung a leak and covered itself in sticky oil, which traps dirt, and eventually clogs airflow through the car. (The evaporator sits in front of the heater core.) The cleaning procedure in TechInfo is designed to clean as much goop as you can reach from the front of the evaporator. Good luck...

Thanks for the advice it worked.