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The time to operating temp (approx 170) may take 1/2 hour on a summer day. At idle, the the engine may never reach a high enough temp to open the T-stat, which will start to open at 185F. If you have a winter cover, it may reach 180 in 1/2 hour at fast idle (1,200 rpm or so) and the T-stat will...

Air in the coolant? How did you refill the cooling system? It hold 8 gallons when you include the radiator. Thermostat open. Water/antifreeze mix? Get a thermometer....