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3. Because the pressure released by the pressure cap passes through the overflow tube, an obstructed tube or overflow
bottle, may cause the cooling system to work improperly. Therefore, the overflow tube and bottle should be checked for
dents or other obstructions. This can be done by visually checking for dents or any other obstructions and by running a
wire through the tube making sure it is clear.
4. Clean the inside of the filler neck, make sure the lower inside sealing seat is free of dirt, nicks or bumps on any kind.
5. Make sure the cams on the outside of the filler neck are not bent because this can affect the seating of the pressure
cap valve and the tester seal will be affected. You can try fixing the cams as long as the solder joint between the radiator
top tank and the neck do not break. If the filler neck is in bad condition and cannot be fixed, replace at a reputable
service store.
6. Check the tester adapter application chart in the back of this booklet to determine whether a filler neck adapter is
necessary. In most cars, where the standard SAE 2-1/8" O.D., 3/4" deep filler necks are used, the use of an adapter is
not required. For testing with this type of filler neck, drop the rubber spacer washer supplied in 1" deep. If an adapter is
required, install it on the filler neck as shown in the back of this booklet.
7. Rotate the pressure valve release handle on the top of the tester head clockwise until it is parallel to the tester head
handle before attaching the pressure tester head to the radiator or adapter. By compressing the pressure valve, the
installation of the pressure head to the adapter is made easier. Release the pressure valve by rotating the pressure valve
release handle clockwise. This seals the tester head to the lower sealing seat of the adapter neck. You should feel the
valve snap into place.
8. Pump the tester until the indicator hand on the gauge reached the end of the color band of the suitable pressure. (To
determine the pressure for the system being tested, check specifications in the owner's manual).
Important:
1. The arrow points of the recommended pressure should never be exceeded! This can rupture the radiator cap and/or
hoses.
2. Never exceed the 30 pound limit, for this may cause serious damage.
9. Observe the gauge after pumping the right amount of pressure into the system.
Indicator hand holds steady
If the pressure holds steady for two minutes, there is no serious leakage in the system. You should however, look for
slight leakage from all points.
Indicator hand drops slowly
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