That is hard to believe that the radiator drain plug is hard to crack open.
Did you use a large phillips and some torque? The thermo housing should be
the same, you need a small copper pipe that the socket wrench will fit onto,
then simply hit the pipe with a hammer and crack the bolts loose. The hose I
never removed when I did my thermostat. It worked fine and no leaks. The
gasket material was still good, so I simply wiped it off of all coolant and
tightened it back up. There is a block nut that drains the coolant just
below the exhaust manifold, that needs removed. There is a air bleed valve
below the distributor (just under it) 10mm bolt. Remove this, the coolant
just needs drained from all. Then I flushed it out with a garden hose until
clear and used 50/50 mix back into the radiator until full.
Chris 92 classic.
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