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Alternative Thermostat Recommendations

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Old Jan 1, 2024 | 04:53 PM
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Default Alternative Thermostat Recommendations

AC Delco & GM are both backordered on thermostats 15-1125 & 12674639.

What brand of aftermarket do you trust?

Thanks!
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Old Jan 1, 2024 | 05:50 PM
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Why are you replacing it?
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Old Jan 1, 2024 | 09:19 PM
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St. Jude Donor '07-'08-'10, '14
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This is the one I used in my Grand Sport a few months ago and it’s in stock.

GM Genuine Parts 15-11113 Water Pump Outlet Assembly with Thermostat https://a.co/d/0iHgCjM

Originally Posted by kodpkd
Why are you replacing it?
pretty common for these to go on C7’s. Most of the time the car either fails to warm up or runs too cool (the rev warning indicators come on and off).


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Old Jan 1, 2024 | 10:31 PM
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I was an hour from home and the thermostat "stuck" open. The fan ran the battery down while I had lunch. I tapped on the housing, it apparently closed and I added water to the tank. One jump start later, I was at home with the car running cooler (180ish) then the 220ish it has run for 60,000 miles.

Yes, My rev warning indicator was showing a lower RPM as when cold.
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Old Jan 2, 2024 | 06:29 AM
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Rockauto has the GM Genuine #1511113.
Or you can try a local dealer.

Years ago, I used Stant for aftermarket parts, but haven't used an aftermarket thermostat for many years.
Dan
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Old Jan 2, 2024 | 07:14 AM
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I just had to replace mine.

Rock Auto
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Old Jan 2, 2024 | 09:32 AM
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Originally Posted by danoaz
Rockauto has the GM Genuine #1511113.
Or you can try a local dealer.

Years ago, I used Stant for aftermarket parts, but haven't used an aftermarket thermostat for many years.
Dan
Interesting. Look what did GM on 2015+ years. Cross references say it won't fit 2014's but it is physically the same.

My 2014 uses a 207 degree.
1511113 run at 194 degrees for 2015+ Corvette
(info found on Dorman)

New Question does it pay to screw around with the range of temperature the car was designed to run at?

Last edited by John Ulrich; Jan 2, 2024 at 09:45 AM.
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Old Jan 2, 2024 | 09:51 AM
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What I don't get........ Looking up thermostat for 2014 Corvette,,,,,, I find them listed at 160* 170* and 207*.
I would think the lower degree thermostat would be listed as racing products.

Last edited by kodpkd; Jan 2, 2024 at 10:58 AM.
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Old Jan 2, 2024 | 10:49 AM
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Okay, in researching this topic of using the lower thermostat..... The ECU is programmed to the temp it came with. So I'll stick with a 2014 fitment.
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Old Jan 2, 2024 | 11:57 AM
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Your running temp was considered by engineers when the engine was designed. It's an important factor, so all things being even, I'd stay with the original thermostat temp.
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Old Jan 2, 2024 | 12:19 PM
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I ordered up a 2014- 207 degree, Murry-Four Seasons from O'Rielly's.

Thanks!
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Old Jan 2, 2024 | 06:50 PM
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Originally Posted by DoubleG
Your running temp was considered by engineers when the engine was designed. It's an important factor, so all things being even, I'd stay with the original thermostat temp.
Absolutely but the engineers work for GM and NOT YOU. They take their marching orders from GM which means it is constrained by EPA, manufacturing cost, ease of assembly, etc, etc. If you happen to like it, so be it.

Edit: Not saying the engineers are bad people or incompetent. Just saying that simply assuming the engineers were given a set of criteria that may or may not correspond to what you may consider desirable. Think of the AFM/DOD system, for example. Emissions requirements, GM wanting to cut cost so we get what we get. IDK of anyone who wanted it besides corporate for their reasons.

Last edited by aklim; Jan 2, 2024 at 07:09 PM.
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Old Jan 2, 2024 | 07:25 PM
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Stay away from the mishimoto thermostats. I went through 2 of them in a year because they get bound up, hanging open and or closed. Other brands were problematic as well. I ended up getting a cheap unit from summit for an old SBC I think, and popped the bulb out of it and pressed it into the steel plate made for our c7’s. Call me crazy but I have not an issue with it since. I did a post on it.

https://www.corvetteforum.com/forums...post1605766450

Last edited by Random Dan; Jan 2, 2024 at 07:36 PM.
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Old Jan 2, 2024 | 07:55 PM
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[QUOTE=aklim;1607388834]Absolutely but the engineers work for GM and NOT YOU. They take their marching orders from GM which means it is constrained by EPA, manufacturing cost, ease of assembly, etc, etc. If you happen to like it, so be it.

Edit: Not saying the engineers are bad people or incompetent. Just saying that simply assuming the engineers were given a set of criteria that may or may not correspond to what you may consider desirable. Think of the AFM/DOD system, for example. Emissions requirements, GM wanting to cut cost so we get what we get. IDK of anyone who wanted it besides corporate for their reasons.[/QUOTE

What is your point?
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Old Jan 2, 2024 | 08:42 PM
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Originally Posted by kodpkd
What is your point?
Don't simply believe that just because it came from the factory one way doesn't mean we should accept it blindly as the best and only way?
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Old Jan 2, 2024 | 09:09 PM
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I replaced mine over the summer with a Katech 174 and no problem so far.
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Old Jan 2, 2024 | 09:48 PM
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"...doesn't mean we should accept it blindly as the best and only way?" True, but it also doesn't mean we should experiment *****-nilly. But, it's the person's call who owns the car.
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Old Jan 3, 2024 | 09:24 AM
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It isn't about what it came with from the factory,,,,,,, it's about what is recommended by the company that made the car. Especially many years after it was manufactured. There are lots of company's trying to sell lots of goofy things that don't work.

Last edited by kodpkd; Jan 3, 2024 at 11:04 AM.
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Old Jan 3, 2024 | 11:30 AM
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Originally Posted by kodpkd
It isn't about what it came with from the factory,,,,,,, it's about what is recommended by the company that made the car. Especially many years after it was manufactured.
Splitting hairs between factory vs manufacturing but there are many who try to defeat the AFM/DOD system although that is what the manufacturer/factory did recommend. Let's use the old fluid for the A8. Oh, wait. Maybe not good to save a few pennies.

Not going to blindly trust the "manufacturer knows what's best for me" kool-aid
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Old Jan 3, 2024 | 12:34 PM
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Originally Posted by wildhog
I replaced mine over the summer with a Katech 174 and no problem so far.
I also have a Katech , only because I am Procharged otherwise I i would have stayed with the OEM , stock my 2015 never went over 200 degrees down here in the south and the LT1 is designed to run hotter than the LS or older small and Big Block Chevy's

Dave
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