(a) provide an air line fitting at one of the radiator openings.
Seal all other openings.
(b) Attach an airline to the fitting and submerge the radiator
in a container of water.
(c) Pressurize the radiator to 10 to 15 psig and check for air
bubbles which will indicate leakage.
Repair radiator as follows:
(a) Straighten bent cooling fins.
(b) Remove light corrosion with number 00 grit abrasive paper.
(c) Repair leaks and cracked or broken brazing by brazing or
Replace radiator if damaged beyond repair.
Install in reverse order of removal.
9-3. DRAINING, FLUSHING,
Never flush a cold system in cold wea-
ther. Warm the engine first to prevent
the flushing agent from freezing on con-
tact with cold metal. Do not disturb
coolant lines when they are cold, as this
could result in breakage of the lines.
(1) Start the engine and run it slightly faster than idle speed until
the water temperature is 180F to 195 F.
(2) Stop the engine. Remove the radiator cap, remove drain plug
located in the metal elbow at the lower radiator outlet hose and
drain coolant. Install drain plug.
Flushing and Neutralizing.
Fill radiator with clean water and the proper amount of approved
cleaning compound. Install the radiator cap.
Start the engine and run it slightly faster than idling speed for
30 minutes. After operating temperature is reached, drain the
system as instructed in a.
Repeat steps a(2) and b(1), substituting an approved
neutralizer for the cleaning compound.