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Pontiac of the Month

4 bucket 67's 1967 GTO

2023 December
of the Month

Grand Prix 2005 heater issues

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My Pontiac Grand Prix GTP2005 does not have heat.  I have replaced the heater core, accutator, thermostat and have flushed the heating system.  After flushing the heater core multiple times and finally replacing it, the heat work for about a day then stops. Any ideas or suggestions for a possible solution?

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