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Q: The low coolant light came on and the heater blows cool air on and off. on 2002 Pontiac Grand Prix

The low coolant light comes on after a while it goes off but comes on back again. The heater blows cool air longer than usual it does get hot after a while.
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First, check your coolant level and top off if necessary. It may be the thermostat is starting to malfunction and need replaced.
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