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In Reply to: thermodynamics specialists? posted by Tom Colitt on May 06, 2002 at 23:52:57:
The earlier suggestion of replacing the thermostat is just common sense. It should be done anyway, like renewing the spark plugs or anything else. As a quick check, pull the thermostat and run your engine without in traffic. It'll take longer to warm up, but if the problem is truley the thermostat, the engine will run cool. It will still get hot if the problem is something else.
Other causes might be the ignition timing. You must use a timing light or have your mechanic tweak it in. If the timing is off -- you WILL over heat. Another common problem is the air/fuel ratio. If your fuel mixture is too lean, then your engine WILL over heat as well. Check the Oxygen sensor voltage. A high reading will feedback to the computer that too much fuel is in the exhaust -- and the fuel pulse width times will be shortened proportionally = too lean.
Other things might be airflow blockage. Pull the radiator and make sure the fins aren't clogged with dirt/grease, bugs/leaves or just bent fins. Also if the engine compartment isn't set up for proper flow through, the engine will over heat. Check that the only air getting in to the engine is through the radiator, and not through various openings in the front. Block-off any misc openings with black elect tape or the like to force air through the rad.
Have Fun!
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