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Early 2000's Tahoe??
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<blockquote data-quote="zuk88" data-source="post: 1477396" data-attributes="member: 16802"><p>The early 5.3 engines had bad cylinder heads.Not all of them but a lot of them had internal coolant leaks where coolant would leak through and around the head bolts under the valve cover and eventually make the lifters start ticking and then lead to failure.It was such a slow leak it would take a week or two for the coolant bottle to turn the light on and to detect the leak I would use a pressure tester over night and remove the valve covers to find the leaks,it was pretty common.Of course the 6.0 never had this problem.</p></blockquote><p></p>
[QUOTE="zuk88, post: 1477396, member: 16802"] The early 5.3 engines had bad cylinder heads.Not all of them but a lot of them had internal coolant leaks where coolant would leak through and around the head bolts under the valve cover and eventually make the lifters start ticking and then lead to failure.It was such a slow leak it would take a week or two for the coolant bottle to turn the light on and to detect the leak I would use a pressure tester over night and remove the valve covers to find the leaks,it was pretty common.Of course the 6.0 never had this problem. [/QUOTE]
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