A gas analyzer will show high levels of HC in the exhaust before there
are any other visual indications - Of course there are other reasons HC
might be high; that's where knowing what you're doing rears its ugly
head.

There is a chemical test for exhaust in the coolant that's fairly reliable;
bubbles in the coolant is end-stage. If you're still driving the car at tha=
t
point have your Nike's in the car. And your checkbook.

Likewise with white smoke. Do a pressure test...
--=20
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