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Because ethylene glycol and propylene glycol do not have the same specific gravities, the use of a hydrom- NOTE: A refractometer should be used if the glycol TESTING SYSTEM FOR LEAKS With engine not running, wipe the coolant bottle neck sealing seat clean. Attach a radiator pressure tester to the coolant bottle, as shown in (Fig. 10) and apply 104 kPa (15 All hoses, radiator and heater, should be moved while at 15 psi since some leaks occur while driving If there are no external leaks after the gauge dial shows a drop in pressure, detach the tester. Start WARNING: WITH TOOL IN PLACE PRESSURE BUILDS UP FAST. ANY EXCESSIVE AMOUNT OF If the needle on the dial does not fluctuate, race the engine a few times. If an abnormal amount of There may be internal leaks which can be deter- mined by removing the oil dipstick. If water globules LOW COOLANT LEVEL Low coolant level in a cross flow radiator will equalize in both tanks with engine off. With engine • Transmission oil will become hotter. • High reading shown on the temperature gauge. • Air in the coolant will also cause loss of flow through the heater core. • Water pump seal may run dry, increasing the risk of premature seal failure. • Exhaust gas leaks into the coolant can also cause the same problems. DEAERATION Air is removed from the system as it gathers in the coolant bottle and is released into the atmosphere TEMPERATURE GAUGE INDICATION At idle the temperature gauge could rise slowly to about 1/2 gauge travel. The fan will come on and the Fig. 10 Pressure Testing Cooling System 7 - 12 COOLING SYSTEM 300M DIAGNOSIS AND TESTING (Continued) |