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Fig. 2: Pressure Testing Radiator Cap Cooling System 1. Turn ignition off and allow engine to cool. Ensure radiator if filled to correct level. Remove cap and attach pressure tester to radiator. Pressurize tester to full radiator rating specification. 2. If pressure drops, check for external leaks. If no leaks are found, start engine and allow to idle. If pressure builds up immediately, check cylinder head and block for cracks. If pressure does not build up 3. Using pressure tester, pump cooling system up to pressure specified on radiator cap. If pump gauge pointer vibrates, compression or combustion leak into cooling system is indicated. Isolate leak by CAUTION: DO NOT allow excess pressure to build in cooling system or damage may result.
1998 Chevrolet Pickup C1500 GENERAL INFORMATION General Cooling System Service
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