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9. Observe the gauge after pumping the correct 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
This indicates a small leak. The radiator, hose gaskets and the heater core should be checked. Note: After
repairing the leaks, the system should be rechecked for additional 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 in the oil, then the
leak could be in the transmission cooler. 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 the
result of a blown gasket, replace the head gasket.
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