Cooling System

With engine stopped, wipe radiator filler neck seat clean. Fill radiator to correct level. Attach cooling system tester to radiator and pump until pressure is at upper level of radiator rating. If pressure drops, inspect for internal leaks. If no leaks are apparent, detach tester and run engine until normal operating temperature is obtained. Reattach tester and pump until pressure reaches approximately 7 psi. Race engine. If needle on tester fluctuates it indicates a combustion leak.

If needle does not fluctuate, race engine a few more times and check for water at tailpipe. Excessive water would indicate a faulty head gasket, cracked block or cylinder head near exhaust ports. Next, remove oil dipstick and if water globules appear in the oil, a serious internal leak is indicated.