here you go

 

5-10min stop n go traffix
non z51 HTC
approx 90 degrees Outside

 

it does appear the pix that you posted seems to show a different part #

 

I see it - blew it up - and I can see the degree mark and all. And, I agree that the test from the manual does not say what the thermostat is rated for - just when it should open. The rating is supposed to be when begins to open, so its still not consistent with the statement in the manual. Possibilities: the manual is wrong, or the picture is generic and not the actual part.

I searched the manual more using the term 'normal range" and found several items of interest. These are the ranges that are expected when running diagnostics. Some of them appear in several places in the manual, and are all consistent. I'm not posting this to prove anything about the thermostat - the original discussion was just about normal operating temperature.

 

with it being a mid engine it probably will have a wider range of temp since it doesn't get as much air flow as front mounted C7. another possibility is GM could have also change the spec of thermostat like they did with the c7. i believe the first year c7 the thermostat was rated at like 205* ish before they change it to 194*, or it could be like you stated that it could be a generic pix but if it is what car would be using a 70* C stat?

looking closer that what you posted from the service manual, that temperature range is for engine idling (no air flow), right?

 

Great discussion and info. Thanks to all! Definitely feel that mine is operating within normal limits after reading your reply’s.

 

Bought many Thermostats over the years, some for performance at 160 F as I have in my Street Rod. BUT when I looked up that GM part number found it's for C7 and C8 Vettes and the C7 did not use ~160F Thermostat!

All I found re that part number, BUT not from GM, said temp was 187 (found on C7 Forum!)

Now if it is 70C (= 158 F) mine and many read typically 175 F. If it is really a 187 F why is reading lower? Sensor location at input from rads? Have watched Thermostats in a pot of water on the stove. It opens pretty quickly to wide open. More confusing than answer.

My guess is it's a generic pic! Need someone to buy one!

 

100% normal, Mine runs the exact same way as yours, and mine is a non-Z51 coupe

 

The normal operating ranges are what would be measured under the specified conditions, during diagnostics - That would mean the car is not moving. There is no comment about air flow - there are thermostatically controlled fans, front and rear, that may or may not be running - and there would be some flow through the engine compartment due to convection - you can put your hand over the vents and feel the hot air come out. It is whatever it is for the conditions specified. As for the thermostat test - when it is supposed to open and close - that is a static test of the thermostat off the car. I can't comment on the thermostat rating. I also cant comment on the relative airflow between C7 and C8. I do know that Tadge talked about the fact that the mid engine design posed a challenge regarding airflow, and that is also discussed in the mid engine revolution book that can be purchased at the museum and on line. So they went to great lengths to manage the air flow to insure that the cooling system capacity on the C8 is adequate (more than adequate for the street). That being the case, I would not have a basis for concluding that the air flow is "less" or more.

 

Took mine out today.. 20 minute drive on the back roads in Sport mode.... ~ 165°. I had to idle for a few minutes so I could check the oil with water at 176°.

 

Yeah - thats a good question. I should point out that when those normal operating temps are specified, that is what the tech will see when using a scan tool - so it using the same sensors in the car. Those are the temperature ranges that that will be seen by the car sensor (s). And, actually there are at least three different temperature sensors in the car - I do not know which is used for the temperature that is displayed, but you will note that in the item I posted the sensor locations are stated.

 

I have had my C8 almost 2 years and 8000 miles. It temp here in Phoenix gets well over 110 and my engine temp has never gone over 192. Usually under 180.

 

But which one would we buy? Since it came up, I looked further into what is listed for thermostats for a 2022 Stingray. I used the GM parts now site. The search returned 9 items - 6 of which were thermostats. Of the six, three include a housing. Earlier I mentioned that there are at least three thermostats, and speculated that they may be all the same. They are not. One of them is for the oil cooler inlet. The oil cooler is a heat exhanger between oil, and engine coolant - this thermostat is in the coolant line. There is a temperature gauge there too - I listed it earlier. One of the items listed indicates it is a 185 degree thermostat. And one indicates it is a 180 thermostat. That one looks a little different from a conventional thermostat, and so does the oil cooler inlet thermostat. The interested reader can go to the site and read the details for each. I'm not going to attempt a conclusion here.

 

And, I will now add to post 33, here are the three different thermostat locations - by looking at these, and then at the parts listing, I think one can figure out what goes where. And, it appears to suggest that maybe the spec temps for them may differ. I was wrong when I speculated that they were the same. The third image below applies only for option code V09 which I think is only used for cars shipped overseas to countries with high ambient temperatures. It includes a fourth radiator on the left rear side.

Its part 2 in this diagram:





Its part 3 in this illustration - this is the one that looks like the conventional thermostat:



Its part 1 in the illustration below. This one applies only for option code V09 which I think is only used for cars shipped overseas to countries with high ambient temperatures. It includes a fourth radiator on the left rear side.

 

I find the replies that "my engine is in the 160's never higher than 190" and what not to be very strange. It is very clear to me how many owners literally never drive in urban environments. These cars (as do all) heat up well above 200 idling with the AC off. High 90's in Pittsburgh this summer I definitely saw 212 a few times in urban traffic. The AC fans keep the temps lower when it's not that hot out. Also need to note that a z51 isnt really up to temp until the OIL temp is at around 178, which is the temp specified to check the oil. I will guarantee that the oil temperature never gets to that temp until the coolant temp is well above it, (under normal low load running)

 

or take the stock thermostat out and see what temp is stamp on it.
has anyone notice what the temperature is at when the stat first open from a cold start? one would see the temperature drop a couple degrees (assuming someone get on the freeway right after a cold start and maintaining a steady speed like 65mph until thermostat first opens up)

 

Thanks for pics. Knew there were "thermostats" from the Z51 auxiliary rad coolant to liquid/liquid heat exchanger on the DCT and one on the engine oil/coolant liquid/liquid heat exchanger but not were. The location one for the engine oil still not clear.

All I searched was the part number given which says it was for the C7 and C8 Vette years so "assumed" it was for the engine coolant. A forum post in the C7 section showed 187!

 

Have no idea why I keep "stuff" but just looked at one of the thermostats I tried for the 8.2 Liter BB engine in my street rod. Robershaw Box says Extra Performance and a sticker says Hi-Flow 180. However, the thermostat inside is only stamped "STC" ?? Been 22 years since I finalized the cooling system so have no idea even which one it is!

Same tool cabinet draw in the garage had 6 sets of spark plugs tried before finally finding a copper core NGK that had a heat range that didn't foul when starting and idling or overheat when under full power! Wife is right, should clean out the garage stuff not needed!

 

Yeah, I'm having trouble with that one too. I found some better pictures that show the layout of the cooling system, and better show the location and function of each thermostat. But I can't reconcile that with the thermostat for the oil cooler inlet. I'll post them in a little while. I think that one of the rear "auxialiary" radiator is involved with the oil cooler. I think I recall someone ever posted a statement to that effect.

 

Here are some images from the 2020 Service Manual, showing the layout of the cooling system, and the thermostat locations. The Z51 "adds a rear-mounted third radiator", that is found on the passenger side. I believe this referred to as "Heavy Duty Cooling System" and is option code V08. There is apparently an option for a fourth rear mounted radiator, on the left (driver) side, code V09. I think I have read that this is included on models shipped overseas to countries with sustained high temperatures. It is called "cooling system - powertrain, high ambient". I have the Z51 and I can see the radiator on the right rear side. The left side scoop contains just a fan, for cooling of the engine bay. I stated earlier that I found three thermostats in the system in the Service Manual. Turns out, I was wrong once again. That third thermostat is associated with option V09, the fourth radiator, and will not be found on US models as far as I can tell. So there are two, 1 at the water pump inlet that I have identified. This is the conventional thermostat, and is the one that has been the subject of the discussion about thermostat ratings. The other is associated with the right rear radiator on Z51 models. The illustrations in the manual include the front two radiators, the right rear with "V08 and V09", right rear without "V08 and V09", and left rear with V09, and left rear without V09. There is no right rear with V08 only. So, I am attaching the front, left rear without V09, and right rear with "V08 and V09", I have indicated the thermostat locations in those images.

First, here is the layout for the front radiators:



Next, here is the left rear, without the V09 option. No auxiliary radiator here. What may be of interest is the A/C tube to the Engine Oil Cooler Adapter.....not sure what that means exactly. That's for another discussion - but I did see that mentioned in other places as well.




Here is the right rear, showing the auxiliary radiator. Both thermostats that I found are indicated.