Quote Originally Posted by industrialfish View Post
First make sure your coolant level is good, then bleed the air out of the coolant system by running the engine until hot while the brass bleeder screw (7 or 8 mm) on the thermostat housing is open. Once it stops bubbling and starts streaming coolant close it again. You may need to repeat a few times over a few days.
Will try that

Where in MI are you, btw?
the thumb area, thankfully far from Detroit area and away from Flint and Saginaw.

Quote Originally Posted by industrialfish View Post
Also if the cat code is P0420, on a 2005 your cat is probably on it's way out.
Bah, that is well over $100 plus labor. Should I get the O2 sensor replaced at the same time? Since I don't have emission control in where I live, that is only in Detroit Metro area IIRC so I should be OK ignoring it for a few months.