ive been dealing with poor heat and a/c with my 95. the fan doesnt blow forcefully, so i want to start with the filter to see if its plugged, but i have no idea where it is.

 

blazers do not have one. The fan is probably starting to go.

 

there has to be some sort of screen somewhere. the fan functions on all speeds, it just doesnt move much air

 

Could be leaves or other debris plugging up the cowl. You'll have to remove the windshield wipers and then the cowl screens. Then you will have to reach down the side of the cowl to get to the HVAC intake.

 

well, i found the problem. my heater core was clogged with rust. i back flushed it while i was replacing my waterpump and i got a lot of large debri out of it. its definatly blowing a lot hotter, the true test will come once its cold again later this week