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If what you mean is that the air comes out the defrost rather than the vents, this may be a vacuum leak, bad vacuum check valve, or bad blend door actuator.
Since you have climate control There would be three possibilities. 1st Would be the blend door actuator, Which you said they replaced. Did they make sure it worked? 2nd would be the controller itself, not opening or closing the blend door. 3rd would be that the A/C is not working or isn't fully charged. Just because the compressor clutch kicks on and is turning, doesn't mean the system it working properly. I do all my work with a set of high and low gauges. Not the best, but they work. Even a little humidity in the system will raise the temperature coming out the vents. That's why A/C places have machines to pull a vacuum. Taking it to a dealer they should have caught everything. Want more info? randyohler/at/att/dot/net
Black smoke is usually extra fuel, but you say you are priming it to start so that could be why. Have you checked fuel pump pressure before and after cranking ?
Go to autone get 2 ft of 7/32 and 5/32 vacuum line its like four bucks then open hood on drivers side attached to hood is a black air canister there should be a vacuum line running from it down to a t where two others meet replace hose from engine and to canister ud should be good to go akso vents
what does it smell like? antifreeze, burning wires, oil, no smell, here is my best guess, 1- heater core, 2- heater blower motor burning up, 3- engine oil, and 4- steam condensation, 5- a ghost.
I believe the problem you have is a leaking heatercore, I have not done one on a Blazer- Jimmy but will get to do it soon to mine ( 1998 Jimmy )it looks to me as though you have to access this from under the dash and inside the truck. If your more of a large type, like me, you might want to concider having your local mechanic do it as working under the dash and upsidedown could be a little uncomfortable. Hope this helps. Cornbread.
CHECK TO SEE IF A VACCUM LINE DISCONECTED SOME HOW. OR YOU CAN CHECK BEHIND GLOVE BOX TO SEE IF VACCUM DOOR IS OPERATERING PROPERLY,NOT SURE IF IT IS THE SAME AS A 2003 S-10 BLAZER.
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