Thermostat.
Thread Starter
5th Gear
Joined: Feb 2025
Posts: 5
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From: Boston
Thermostat.
I know this has been beat to death but i justbpulled my thermostat. This thermostat and the new one i planed on putting in do not sit in the water pump flush. They need to be pushed in a bit before sitting flush to water pump. Is this normal? The tstat mentioned is the 2 bolt and i see they have the 3 bolt stats with a dog leg kind of deal. Any help would be appreciated. Thanks
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
I know this has been beat to death but i justbpulled my thermostat. This thermostat and the new one i planed on putting in do not sit in the water pump flush. They need to be pushed in a bit before sitting flush to water pump. Is this normal? The tstat mentioned is the 2 bolt and i see they have the 3 bolt stats with a dog leg kind of deal. Any help would be appreciated. Thanks
The thermostat does not go in the water pump. Depending on the year and/or if you have already replaced the pump, you either have a one piece thermostat housing assembly, or you have a two piece thermostat and housing(thermostat goes in the housing). I have never seen a 3 bolt thermostat housing for an LS1/2/6.
Perhaps take a picture of what you are struggling with.
Last edited by lucky131969; Apr 7, 2025 at 07:37 PM.
Thread Starter
5th Gear
Joined: Feb 2025
Posts: 5
Likes: 0
From: Boston
Its a 01 base. Im unsure if the pump has been replaced the thermostat i pulled is a 2 piece but like i mentioned the thermostat is semi loaded when bolted to waterpump. Which would mean its always semi open. Do i need the 3 bolt dog leg tstat, is the 3 bolt tstat non removable from housing? Will take pics tommorow thanks in advamce for any response.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
Its a 01 base. Im unsure if the pump has been replaced the thermostat i pulled is a 2 piece but like i mentioned the thermostat is semi loaded when bolted to waterpump. Which would mean its always semi open. Do i need the 3 bolt dog leg tstat, is the 3 bolt tstat non removable from housing? Will take pics tommorow thanks in advamce for any response.
Thread Starter
5th Gear
Joined: Feb 2025
Posts: 5
Likes: 0
From: Boston
Okay so i pulled a 04 to present thermostat out. I suppose the old style would not fit. My concern is still that the thermostat spring is being loaded when installed, not much maybe a quarter inch but still it means it is always partially open. I might just get the dog let thermostat and see if that fits. Unless there is a way to check original pump without digging into engine.
Tech Contributor
Joined: Jan 2007
Posts: 19,465
Likes: 1,167
From: Dyer, IN
