Help Thermostat o ring question
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Safety Car
Joined: May 2006
Posts: 3,732
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From: Shelton, Connecticut
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Help Thermostat o ring question
My 2019 Z51 thermostat is stuck open.
Got a new GM thermostat.
Just removed original thermostat and found that the o ring is glued on the flat surface.
The new stat has an o ring.
Am I supposed to use the original sealing ring or the new stat o ring?
The new stat will not sit flat because there’s no groove for the o ring to sit in.
Got a new GM thermostat.
Just removed original thermostat and found that the o ring is glued on the flat surface.
The new stat has an o ring.
Am I supposed to use the original sealing ring or the new stat o ring?
The new stat will not sit flat because there’s no groove for the o ring to sit in.
Thread Starter
Safety Car
Joined: May 2006
Posts: 3,732
Likes: 710
From: Shelton, Connecticut
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Update
I used the new thermostat and the o ring that came with it.
I was able to get the housing to sit flush with the mounting boss without
applying too much torque on the T-30 Torx bolts.
I used a 3/8” drive T-30 Torx socket with a 3/8”to 1/4” drive adapter.
Worked well to help prevent over torque.
Hoping it doesn’t leak.
I was able to get the housing to sit flush with the mounting boss without
applying too much torque on the T-30 Torx bolts.
I used a 3/8” drive T-30 Torx socket with a 3/8”to 1/4” drive adapter.
Worked well to help prevent over torque.
Hoping it doesn’t leak.
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Good luck - just keep a close eye on the area for a while for any potential leaks.
Safety Car
Joined: Mar 2006
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From: Chester VA
John,
There have been several different part numbers for the thermostat, as a newer version supersedes an older one. I don't know if any change pertained to the o-ring or a mounting groove. I believe the current numbers are GM #12674634 and ACDelco #15-11113.
Did you have one of those?
There have been several different part numbers for the thermostat, as a newer version supersedes an older one. I don't know if any change pertained to the o-ring or a mounting groove. I believe the current numbers are GM #12674634 and ACDelco #15-11113.
Did you have one of those?
Thread Starter
Safety Car
Joined: May 2006
Posts: 3,732
Likes: 710
From: Shelton, Connecticut
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16
Got the 15-1113 from Rock Auto.
The thermostat failed on my 2016 Z51 at 19,400 miles.
Just picked up this 2019 with 23,700 miles.
The thermostat failed on my 2016 Z51 at 19,400 miles.
Just picked up this 2019 with 23,700 miles.
