Increasing the pressure on the system will not aid in cooling. It merely increases the boiling point of the coolant.
It should make no difference in temperature readings - they will be the same with a 5 pound cap or a 15 pound cap. It won't boil over as readily though. They may interpret this as "increased cooling", but the cooling capacity of the radiator remains unchanged.
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Charlie McCall
1985 DeTomaso Pantera GT5-S #9375
"Raising Pantera Awareness across Europe"
http://briefcase.yahoo.com/gt5s_1985
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