Vortec L31 cylinder head
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*engines that still have antifreeze in them. Engines with straight water, or without any coolant showing, may well have been losing coolant. No one replaces leaking coolant with antifreeze- they will use straight water "until I fix it". By then, it's often too late. | *engines that still have antifreeze in them. Engines with straight water, or without any coolant showing, may well have been losing coolant. No one replaces leaking coolant with antifreeze- they will use straight water "until I fix it". By then, it's often too late. | ||
*engines with water in the oil or oil in the water. This is a sure sign of a blown head gasket or cracked casting, either of which can lead to overheating and cracked heads. | *engines with water in the oil or oil in the water. This is a sure sign of a blown head gasket or cracked casting, either of which can lead to overheating and cracked heads. | ||
| + | *vehicles that do not have antifreeze receipts or antifreeze or water jugs laying around inside the vehicle. That's another sure sign there was a problem with the cooling system. | ||
*Look for engines that do not have evidence of stop leak in the radiator/cooling system. If it has stop leak, it was leaking. If it was leaking there's too big of a chance it overheated and cracked the heads. | *Look for engines that do not have evidence of stop leak in the radiator/cooling system. If it has stop leak, it was leaking. If it was leaking there's too big of a chance it overheated and cracked the heads. | ||
**Signs of stop leak use is a sludgy or copper/silver colored metallic accumulation inside the radiator fill neck, the same thing under the radiator cap, and possibly even in the overflow tank. | **Signs of stop leak use is a sludgy or copper/silver colored metallic accumulation inside the radiator fill neck, the same thing under the radiator cap, and possibly even in the overflow tank. | ||
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