Thermostat - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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.

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Old 12-12-2006, 12:51 AM   #1
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I have a 1994 Bonneville SE...Can someone tell this ol fellow where the thermostat is located so my son can help me put one in. Many thanks
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Old 12-12-2006, 01:30 AM   #2
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its located under the metal thermostat housing on the top to the motor where the upper rad hose is clamped to
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Old 12-12-2006, 07:53 AM   #3
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Like Peter says, if you follow the top radiator hose to the engine, the part it connects to is the water outlet. That water outlet piece has two 10mm bolts that hold it to the engine and the thermostat is directly below it.

You year should have a rubber gasket around the thermostat and a paper gasket for the outlet housing.
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Old 12-12-2006, 09:21 AM   #4
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Thank you for your time...
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Old 12-12-2006, 11:18 AM   #5
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If you drain the coolant below the thermostat, make sure you fill the engine at the thermostat opening first. These engines are prone to trapping air. That can cause problems. If you follow this coolant fill procedure in techinfo, you will be OK.
http://www.bonnevilleclub.com/forum/...=article&k=100
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