Cooling System

With engine not running, wipe radiator filler neck seat clean. Fill radiator to correct level. Attach tester to radiator and pump until pressure is at upper limit of radiator rating. If pressure drops, inspect for external leaks. If no leaks are apparent, detach tester and run engine until normal operating temperature is obtained. Reattach tester and pump to about seven psi. Race engine, if needle on dial fluctuates it indicates a combustion leak.

If needle does not fluctuate, race engine a few more times and check for water at tail pipe. 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.