How can you tell if you have a leaking gasket or seal?
You will see puddles on the pavement, color of fluid and location can help determine where it is coming from Also, to check cylinder head gasket, a compression test is useful. Low compression between two adjacent cylinders, will point to a blow in the gasket between cylinders Check for exhaust gas in the coolant, using a proprietary sniffer device mayonnaise like, white jelly, in the valve cover or oil filler, will point to coolant in the oil.
On both the 4.3 L and the all aluminum V-6 engines the culprit is a composite gasket made out of rubber and plastic. This delicate part is lightly squeezed between the cylinder head and the aluminum or plastic intake manifold. To exacerbate the problem it seems the minimum amount of bolts was used and they have an extremely light torque specification.
When you put all these issues together it's surprising to find one that is not leaking. Identifying intake manifold leaks on the GM cars mentioned in this article can be challenging. One of the reasons for this is the leak starts off small with little or no symptoms of a developing problem.
Often the first telltale sign is a low coolant warning light accompanied with a consistently low coolant reservoir tank(http://autorepair.answers.com/cooling-and-heating/coolant-recovery-tank-and-radiator-cap-problems). The distance from the full mark to the point where the light turns on is less than a half gallon of antifreeze. It's not unusual for owners to top off the reservoir tank and drive the automobile for a month or more before the light comes back on again.
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