coolant loss problem returns... - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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coolant loss problem returns...
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Posted by Bill7 [Email] (more from Bill7) on Sat, 17 Dec 2011 10:02:39 Share Post by Email
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'97 900S 2.3
As some may recall from my previous posts, I had a problem with cooling loss through the reservoir cap. I had replaced all the hoses, t-stat, and cap. When fully warmed up and at idle I had turbulence in the coolant reservoir, and could see that I was blowing coolant right through the cap.

Following advice from this forum I re-torqued the headbolts (loosened one at a time, torqued to 44#, then +90 degrees). NOT following the advice of this forum I did not replace the head bolts, just used the existing bolts.

The problem seemed resolved and life was good... for maybe 1000 miles. Now I am once again losing coolant and it appears to be blowing past the reservoir cap. I do not see turbulence in the reservoir at idle as before however, but I'm guessing at higher rpm it would be.

The question is this: could the old head bolts have stretched more, allowing leakage between the combustion chamber and the water jacket, pressurizing the cooling system? Is a head gasket replacement inevitable, or might installing NEW head bolts resolve the problem once and for all? I'm thinking new head bolts is worth a shot. If that doesn't work I can default to a head gasket job.

Thoughts on this?
Thanks!

posted by 67.172.94...

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