My '87 Laredo blows air out of the defrost only which I've read is the default when the vacuum tubes have a leak, clogged, disconnected, etc. I have no idea what I'm looking at. Can somebody walk me through what I should check and how to do it? Tired of being hot in Summer and cold in Winter.

Thanks for your help!

 

Bump - Anyone?

 

so all it does is defrost?

if so theres a canister under the hood, with one vac hose in it. fallow it to the intake manifold and clean out the little filters and the hoses. put it back together and try that out. its the vacuum supply for the heater.