If your engine comes up to temp just fine, your mech was referring to the "heater core." This is mounted not in the dash but below and it is pretty involved to get to.
I have heard of people using those heaters and some get by.I would think that is a pretty poor option.
Since your heater core is clogged, no harm in trying to flush the whole system to see if you could get something going. If that doesn't work, you are left w/ either no heat, a poor patch job (like some aux heater he was referring to) or. Find a nice warm garage, get some friends who know something about it. Cook a bunch of food and have a LITTLE beer maybe, and get you hands dirty. Oh, you will also need a reputable repair manual that can help you through.
Seriously, this is an involved project and time consuming but it is not undoable by your typical DIY'er. Give it some thought.
Hope this helps
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Wednesday, December 19th, 2007 AT 1:05 PM