Vortec 1600 - Cooling System Leak Testing

2-8 Engine Cooling Industrial 1.6L
• The tester temperature scale is reversed from
the standard thermometer scale in that below
zero readings are on the upper half of the
scale. Readings on the lower half of the
scale, which are the above zero readings,
indicate solutions without enough antifreeze
concentration to provide adequate rust
protection.
• Tilt the tester toward the light source in order
to obtain the best results. If the edge of the
shadow is not defined, the measuring
surfaces are not clean or dry. Wipe the tester
dry and retest the coolant.
Cooling System Leak Testing
Notice: Pressure above 139 kPa (20 psi) should not
be used when pressure testing the cooling system.
Pressures over 138 kPa (20) psi will damage the
radiator.
Some core leaks are detected by adding water to the
radiator. Clean the core using the following procedure
so that the damaged area can be found:
1. Remove the dirt and the insects from the fins with
a common water hose that does not have a
nozzle. Excessive water pressure could damage
the fins.
2. Scrub the core with a soft–bristle brush using
clean hot water or hot water with a mild deter-
gent.
On–Equipment Pressure Testing
Tools Required
J 24460–01 Radiator Pressure Tester
Pressure–test the radiator with the J 24460–01. While the
system is at a cool temperature, remove the radiator cap.
Connect the gauge and apply the normal system operating
pressure. Do not exceed 138 kPa (20 psi). Watch the gauge
needle for an indication of a leak. Examine the radiator and
other cooling system parts for escaping coolant.
Repair the hose and the hose connections as required.
Check the radiator cap in order to ensure that the cap will
maintain the correct pressure.
If the radiator leaks during the pressure test, mark the leak
area.
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