I suspect a cracked head is causing the coolant loss on my Chevy Silverado. How can I detect a cracked cylinder head?
The 5.3L and 4.8L V8 engines, from 2001 through 2006 and possibly beyond, had a great many defective cylinder heads used in production. These heads tend to crack after several miles and leak coolant into the engine oil. Having the oil tested for the presence of glycol is an easy test. If the test is positive, the engine should be examined by an experienced technician. We have had very good results finding this problem by removing the valve covers and performing a pressure test. Coolant can normally be seen oozing from the crack, with close examination. See our Detailed Topic GM V8 Losing Coolant With No Apparent Leak for more information.
