I rented a pontiac g6 in california, the coolant recovery bottle is part of the cooling system and is pressurized so that if it ever looks low when hot you can not add coolant (to the recovery bottle) when its hot.
Are all new cars like that?
my 2004 toyota has a vented coolant recovery tank that you can add coolant to at any time.
is this a GM thing? pressure cap on the coolant bottle? the pontiac lost 1/2 inch of coolant each 500 miles (comparing cold levels)
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