1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

180 degree stat Change

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Old 10-11-2005, 04:39 PM
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Default 180 degree stat Change

This is an old post but I needed to get more input and it has new updated info
I haven't driven the car in awhile so I hadn't updated my posts.
I am still losing coolant. I checked the dipstick and the oil is over full so it must be leaking
into it. If all I did was put a new thermostat in, did I mess up a seal or is this a bigger problem. I don't see any smoke coming out of the car and it runs fine.
Old 10-11-2005, 07:10 PM
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if coolant was going into the oil, the oil would look really milky and nasty. you sure its not just leaking around the gasket or a hose somewhere? is your pass side carpet wet? heater core maybe
Old 10-11-2005, 10:05 PM
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Changing a thermostat can not do anything that will cause the coolant to go into the oil.

If you have coolant in the oil, most likely your upper intake manifold failed.
Old 10-11-2005, 10:07 PM
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Originally Posted by BillBoost37
Changing a thermostat can not do anything that will cause the coolant to go into the oil.

If you have coolant in the oil, most likely your upper intake manifold failed.
97% chances of an upper intake manifold failure, 3% chance of headgasket failure
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