The fact remains that I have NEVER seen the removal of the thermostat from
an engine cure any overheating problem. Unfortunately, most people
including many mechanics always seem to take the thermostat out of an
engine as soon as it shows any signs of overheating instead of
troubleshooting the real cause.
I have worked for many years in some of the hottest parts of Australia
where the summer ambient air temperatures routinely exceed 45*C or 113*F
and I have found that in about 90% of overheating cases, the cause was
either blocked external radiator fins (mostly grass seeds) or blocked
internal radiator tubes (mostly scale flushed from the engine block). I
have even found sticking thermostats to be quite rare. When I have found
them, I simply removed the valve body from the thermostat and replaced it
so that it still acted as a restriction.
Anyway, I hope that all this hypothesising is helping Rob cure his M37
problems.
Cheers
Rod Diery
Kulin
Western Australia
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