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Over heats in the summer time if you are not driving at a constant speed.

(1999 Pontiac Sunfire)
in Springfield, MO on July 07, 2011
Over heats when it is not moving at a constant speed if it is hot outside. Runs fine in winter.
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Popular Answer
Driving at constant speed rush air through the radiator cools the engine, when stopped in traffic the radiator needs the electric fan to keep the engine cool. When the temperature gauge reads hot with the engine running see if you can hear the radiator fan running (if not the fan and fan switch need to be looked at for power and functionality). A restricted radiator, thermostat, low coolant level, mildly blown head gasket could all cause over heating but it hard to pinpoint the exact cause of your over heating with out being able to do some basic diagnostic tests. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
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