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Re: 99 Grand Am coolant problem
Check the pressure cap. The system shouldn't boil until over ~260 degrees (even plain water at atmospheric pressure doesn't boil until 212, so an antifreeze mix IS NOT boiling at 200) if the cap is holding pressure. If I remember right, the fans are supposed to kick in at ~220 degrees. If the cap isn't holding pressure, the coolant will boil before the fans kick in. Also, bleed all the air out of the system. There is a bleed screw on the bypass pipe (right above the water pump), and one on the thermostat housing. It may have a line coming off the thermostat housing that goes into the coolant reservoir, if so, you only need to bleed the W/P one. A spill free funnel is great for this (about $12).
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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