Welcome to the NO HEAT club. My heater core went bad on my '88 last week. It was doing the same thing yours did...leaking from that drain tube.
I bet it was dripping on the exhaust and makeing steam all the time...huh?
I have great links on how to replace the core step by step with photos if you want them.(Thanks MOC).
Count on about 8-9 hrs of work replacing it though. I haven't fixed it yet but from what I'm told and read, it's not going to be fun!!
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
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