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This indicates a slight leakage. The radiator, hose gaskets and the heater core should be checked. Note: Minor leaks in
the radiator core may be sealed by a quality stop leak. After repairing the leaks, the system should be rechecked for any
more leaks. In the event that while testing the radiator hose swells excessively, the hose should be replaced because
this indicates a weakened condition.
Indicator hand drops quickly
This indicates a serious leakage. These types of leaks should be repaired by a reputable service shop.
Interior leakage:
A. When the indicator hand drops but there is no visible leakage, this indicates an interior leakage. In this type of
situation, you should remove the tester and replace with the pressure cap. Run the engine to churn up the oil and
then shut the engine off. Examine the oil for light colored foam or water globules by pulling the oil level dipstick or by
removing the crankcase drain plug and draining out a small amount of oil (as water is the heavier of the two, it should
drain out first). If the leakage does not show through the oil, then maybe through the transmission intercoolers. To check
this, check the transmission dipstick for light colored foam or water globules.
B. You can detect compression or combustion leakage into the cooling system in the following way:
1. After the system and the pressure cap have already cooled, apply the tester to the filler neck.
2. Start the engine, letting the engine warm up to normal operating temperature.
Important: If the gauge indicates a rapid increase in pressure, turn off the engine and rotate the pressure valve release
handle on the tester head clockwise until it is parallel to the tester head handle, thus releasing the pressure. Proceed
to remove the tester from the radiator neck. Pressure building up fast can be as a result of a blown gasket, replace the
head gasket. Note: Do not allow the pressure to build up beyond the arrow indicating the maximum for each system,
since this tester is not designed to release pressure below 30 PSI.
If pressure does not build up rapidly, operate the tester pump until the gauge reads within the system range. If the
gauge hand vibrates, indicating a compression or combustion leak, locate the compression leak by disconnecting
one spark plug at a time. Note: This test should be performed properly; otherwise, some systems might be damaged.
Proper procedure can be found in the ignition system guidelines.
When the spark plug of the leaking cylinder is shorted out, the gauge hand will stop vibrating. Retest the system after
repairing the leak.
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