Well, help me figure out where I messed up. I replaced the heater core, which by the way was a real joy. It all seemed to go together without a hitch, but when all was said and done the only place that I am getting any type of air is through the defrost vents. any input would be appreciated.

Thanks

 

Sounds like a vacuum line isn't hooked up properly.

 

Any ideas on the what or where of the line that might be the problem. And what chancee that this could be a problem in teh control???

 

Sorry, our '97 Expy is long gone and I've got no idea which specific vacuum line(s) to check. So, I'd say check all of them.

It's possible that a line has become brittle and got cracked when you were working. So, even though everything is plugged in, you could still have a leak.

If you have any way to make 'fog' or smoke, start up the truck and 'fog' under the dash... watch to see where the 'fog' goes.