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83ZXT..stone stock..113K miles..in pretty good overall cond..THANKS FOR EVERYONE'S HELP

HOW IT STARTED
Few months ago I noticed cool, not cold, air from all vents when temp control lever in hot position. This happened with mode lever on economy, low, auto, and high. But when I moved mode lever to defrost, I got hot air from defroster ducts.

With mode lever set defrost, and temp lever still on hot, blower speed increased a bit whenever I accelerated. Blower speed then returned to normal speed within 10 seconds.

Around this I occasionally found drops of antifreeze on passenger side floor.

WHAT'S HAPPENING NOW:
I turn temp lever all the way to hot but DON'T HEAR ANY VACUUM and find the HEATER FLOOR DOORS ARE NOT OPENING. I turn mode lever to economy, lo, auto, and high...blower doesn't come on in any of those positions. I leave temp lever on hot and move mode to defrost. Blower then comes on...so does air cond compressor...but no hot air from defroster ducts....only cold air.

WHAT I'VE CHECKED SO FAR
All underhood vacuum hoses appear good. What underdash vacuum hoses I could see looked very good....almost like brand new. Coolant level is good. Interior temp guage shows normal operating temperature.

THANKS EVERYONE FOR YOUR RESPONSES.......
Sammy in CT
 
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