Which Thermostat?
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Joined: Jul 2023
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From: SW CO
Which Thermostat?
I will be doing a coolant flush on my newly-purchased 03Z. I understand that there was a production change where the later LS6s use a thermostat integral with the pump-inlet housing [o-ring seal] while the earlier cars use a separable thermostat and a different gasket.
The factory service info suggests that I have the integral variety and looking up the part via the VIN shows GM part 12571261 for the t'stat/housing assembly and 12561155 for the housing 0-ring.
My car is 10-02 production. As far as I know the coolant pump is original.
Are these the correct parts?
The factory service info suggests that I have the integral variety and looking up the part via the VIN shows GM part 12571261 for the t'stat/housing assembly and 12561155 for the housing 0-ring.
My car is 10-02 production. As far as I know the coolant pump is original.
Are these the correct parts?
Last edited by vito02; Aug 11, 2023 at 04:41 PM. Reason: Clarification
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I will be doing a coolant flush on my newly-purchased 03Z. I understand that there was a production change where the later LS6s use a thermostat integral with the pump-inlet housing [o-ring seal] while the earlier cars use a separable thermostat and a different gasket.
The factory service info suggests that I have the integral variety and looking up the part via the VIN shows GM part 12571261 for the t'stat/housing assembly and 12561155 for the housing 0-ring.
My car is 10-02 production. As far as I know the coolant pump is original.
Are these the correct parts?
The factory service info suggests that I have the integral variety and looking up the part via the VIN shows GM part 12571261 for the t'stat/housing assembly and 12561155 for the housing 0-ring.
My car is 10-02 production. As far as I know the coolant pump is original.
Are these the correct parts?
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Joined: Jul 2023
Posts: 91
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From: SW CO
Thank you, Grinder.
Do you think the later, separable thermostat, version uses the o-ring seal for the housing? I am removing the t'stat to do a good flush.
Does a 180F thermostat set "Cooling System Performance" trouble codes [Typically a P2181]?
Do you think the later, separable thermostat, version uses the o-ring seal for the housing? I am removing the t'stat to do a good flush.
Does a 180F thermostat set "Cooling System Performance" trouble codes [Typically a P2181]?
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From: West Seneca NY
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As for the O-ring, yes, I haven't seen an LS1/LS6 housing that didn't use an O-ring. A 180 stat will cause no codes......
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