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To replace the heater control valve in a 2006 Pontiac Montana, first, disconnect the negative battery terminal to ensure safety. Drain the coolant from the radiator, then locate the heater control valve, which is typically found near the firewall. Remove the hoses connected to the valve, unscrew it from its mounting, and install the new valve in the reverse order. Finally, reconnect the hoses, refill the coolant, and check for leaks before reconnecting the battery.

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4d ago

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