An engine-driven pump circulates the ethyline glycol coolant through the engine and back to the radiators. The coolant tank capacity is 3.7 gallons. The tank is filled through a filler neck forward of the windshield on top of the engine cowl. You regulate the coolant temperature manually by opening and closing the cowl shutters. For normal ground operations, on takeoff and on landing, the shutters should be in FULL OPEN. When climbing and cruising, adjust the shutters to maintain a temperature of 850 to 125ú. The desired temperature is between 951 and 105'. COOLANT TEMPERATURE GAGE The coolant temperature gage is on the right side of the instrument panel and is graded from -50' to 150 0. On all models except the N a warning light flashes on when the coolant temperature reaches 125'.

Whenever the coolant temperature reaches 1150 during cruising or 1250 while climbing, follow the procedures for oil overheating described in the preceding section.