First Generation Firebird-L Mailing List ......................................................................... Michael,
225 isn't necessarily unreasonable. A new 190 thermostat is actually within spec if it opens by 222 (according to the Pontiac manual). If the radiator overflowed at that temp, I would suspect either the gauge is wrong or your radiator cap is weaker than the spec of 14-17 PSI.
There are several things that should be in place to ensure maximum cooling capacity, but the coolant color is a more pressing issue. If you recently had the engine rebuilt, I would expect that whoever did it would have started with fresh coolant. Your description of the coolant and the boiling over suggest a leaking head gasket or cracked head.
To diagnose this, you could drain the radiator and block, refill with fresh water/coolant and drive the car for a week or two while periodically checking the condition of the coolant. If it stays nice and green, you may have just been a victim of poor service. If the coolant again turns a frothy brown, you'll have to dig deeper into the engine.
Andy Michael Hershey wrote:
First Generation Firebird-L Mailing List ......................................................................... My bird has had overheating problems for some time, and now that my engine had been rebuilt it still has the old overheating problems. Idling in a parkign lot today it overlowed and read 225 degrees - very hot! I have a 350 2bbl auto with a/c <snip> thanks!!! Michael
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