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Why is your 99 grand am gt overheating with a new thermostat could it be a bad radiator cap?
Wiki User
∙ 14y ago
The radiator cap could be one reason. Improper coolant could be another. Most General Motors vehicles require the use of red Dex-Cool approved coolant, and using the standard green coolant could have a negative effect. The thermostat may be improperly installed or malfunctioning, or sediment in the radiator hoses could be affecting flow of coolant to the motor.
check to see if the cooling fans are functioning and the worst case scenario, a cracked head or bad head gasket.
Wiki User
∙ 14y ago
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