Re: 91 Head gasket replacement? check for leaks - Saab 900 Bulletin Board - Saabnet.com
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Re: 91 Head gasket replacement? check for leaks
Posted by JohnK (more from JohnK) on Thu, 1 Dec 2005 10:50:56
In Reply to: 91 Head gasket replacement?, JLitten007 [Profile/Gallery]
, Wed, 30 Nov 2005 16:50:48
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While a new headgasket is a good thing, I would first locate the source of the leak. In my experience bad headgaskets usually leak internally.
Look for pinhole hose leaks and a leaking A/C thermoswitch in the upper hose. Also check the radiator lower hose clamp and for leaks where the radiator sides meet the core. Upper hoses usually leak sooner than the lower radiator hose.
To check for headgasket leaks, I would inpect each spark plug and look for one or two that are incredibly clean from coolant burning up in the combustion chamber. Also look for telltale bubbles when you rev the engine in the expansion tank, coming from from the small hose leading from the top of the radiator to the expansion tank. Also, check the coolant for oil slicks and for milky white oil in the crankcase(not just a small amount from condensation).
Good luck.
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