Everything including the AC, blower, vents seem to work fine. I
replaced the thermostat thinking that was it and oh well .... no heat.
I notice that the vehicle doesn't reach the normal running temperature
that it used to so I replaced the thermostat ... $10 bucks and removing
some brackets out of the way.

Somebody told me that it sounds like a vacuum problem but where should
I start on checking on the vacuum or with all the postings about
something being clogged is that a problem. I think not because a clog
would probably make it run hot.

Help please... going to snow country in a couple of days!!

NOt really on the clog as the heat valves.ducts are controled by vacum.
A crack of plugged vacum line could case your problem.

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www.thesnoman.com

I had the same problem with my2001 s10 p/u . backflushed th eheater core as
th enew orange anti-freeze tends to clog( so I heard) after 2 years.
Everything worked fine after that Good Luck.

Mel