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Username Post: Engine Temperature
"7th Year" Silver Supporting Member
Posts: 1777
Loc: No. Virginia
Reg: 01-18-13
06-06-21 04:30 AM - Post#2821200    
    In response to RATHD

The cooling system should basically maintain the coolant temp at the thermostat setting (180F, for example) at forward speed (25 mph, or so). At idle/traffic; add about 10%. But the system should return to 'normal' when forward speed is resumed. Temps look mostly normal under the conditions.

A 50/50 coolant mix at 15 psi does not boil until about 265F.

The GM 'idiot' lights did not start to 'illuminate' until around 235F.

A 180F thermostat is recommended for cast iron cylinder heads; 190F for aluminum.

Ignition timing impacts temps. You may 'cool' a little by checking.

Here's a little reading that may be helpful:


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