Gentlemens:
My inherited 1992 Taurus wagon with the 3.0 liter engine overheated last Friday while I was sitting at KFC waiting for my order. I got it home without causing any apparent damage as the car cooled down almost the second I got it moving again and the gauge never quite pegged even at its hottest. The upper radiator hose was no more than warm but on the bright side the oil dipstick didn't show any evidence of antifreeze.
I got a new thermostat and removed the housing to get at the old one. I scraped the old gasket off the side of the engine with a sharp piece of oak and polished it up (engine side only) with a scotchbrite pad. After I installed the new thermostat and gasket, I tightened things up and tried it. The upper radiator hose gets plenty hot now after a few minutes but there was a little squirt of sweet smelling fog blowing out the side of the thermostat housing where the gasket is supposed to seal it. I tightened things up as much as I dared. The fog is gone now but there is a definite hissing coming from that same area when I stop the car. I see a small stain on the driveway after it's been parked.
Coincidentally, I found the radiator fan was disconnected but that is corrected now and is apparently functioning correctly.
I have driven it several miles in stop and go traffic and the temp is completely normal now. Which leaves me with the leak. Was I supposed to squirt some sealant on the gasket before I placed it? I don't see how I can seal this up otherwise. Maybe I should have scotchbrited the housing too (it didn't seem like it needed it)?
Thoughts?