TM 9-2320-386-10 3-20 3-6. BREAK-IN OPERATION (Contd) b. After Road Test. After the road test, correct any faulty condition that can be done at operator’s maintenance level. Notify unit maintenance about any other faulty condition. 3-7. CHECKING FLUID LEVELS a. Coolant Surge Tank. WARNING Care must be taken when removing surge tank filler cap. Steam, or hot coolant under pressure, may cause injury to personnel. (1) Check coolant level through sight tube (4) on surge tank (3). (2) If coolant level appears low in sight tube (4), remove surge tank filler cap (1), and add coolant through filler tube (2) as necessary. Fill surge tank (3) until coolant level is centered in sight tube (4). (3) Install surge tank filler cap (1), start engine (para. 2-12), and run to normal operating temperature of 160°-230°F (71°-110°C). 1 2 3 4