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took it for test today...62 mph with 44.9 gph air temp 82 ran for twenty minutes consistent readings..temp looks like two notch short of half way on temp gauge

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took it for first mini trip one hour highway and one hour mix...no problem, in fact my mpg has INCREASED...COMBINATION AT 34mpg, highway...had to check...it showed 43.6 mpg highway at 60/62
 

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Torque doesn't have the correct pid for oil temp.. you have to google and fix that. Mine never gets hotter.

It's impossible.

I've never seen it. In any vehicle or semi.
First of all this whole oil temp argument on the 1.4 is silly as it's not measured anyway, there's no oil temp sensor

And oil temps ROUTINELY and EASILY exceed coolant temp on most gasoline GM engines(and gas automobile engines in general)

I can get the oil temp over coolant temp in less than 5 minutes of spirited, legal speed driving on GM V8(that actually has a temp sensor)

Semis are A: diesel, B: low rpm, C: use many gallons of oil and have large surface area sumps. All these things contribute to lower oil temps, though I'm sure there are times when certain chassis and engine combos have oil temps higher than coolant, it happens in class 3,4,5 trucks all the time under load.
 

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First of all this whole oil temp argument on the 1.4 is silly as it's not measured anyway, there's no oil temp sensor

And oil temps ROUTINELY and EASILY exceed coolant temp on most gasoline GM engines(and gas automobile engines in general)

I can get the oil temp over coolant temp in less than 5 minutes of spirited, legal speed driving on GM V8(that actually has a temp sensor)

Semis are A: diesel, B: low rpm, C: use many gallons of oil and have large surface area sumps. All these things contribute to lower oil temps, though I'm sure there are times when certain chassis and engine combos have oil temps higher than coolant, it happens in class 3,4,5 trucks all the time under load.
The last semi I drove was just as hot or cold as my cruze.

It raised a few degrees climbing donners at 25 mph along with the water. And cooled right back down on the downgrades.

And regardless how the cruze works. It appears to be reading temperature.

It don't seem to be reading pressure, though.
 

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It doesn't read pressure, or temp. There's no sensors that provide that data. Temp is an algorithm just like catalyst temperature is
 

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The last semi I drove was just as hot or cold as my cruze.

It raised a few degrees climbing donners at 25 mph along with the water. And cooled right back down on the downgrades.

And regardless how the cruze works. It appears to be reading temperature.

It don't seem to be reading pressure, though.
Boy, that's two ends of the spectrum for vehicles driven! I bet the Cruze felt REEEAAAAALLY small after you had driven the semi for a while.:)
 

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today, after procrastinating, I changed over to the lower temp thermostat, and replaced the leaking reservoir with 15 psi cap, and replaced bypass hose that was cracking and the reservoir hose. All parts either leaking or about to leak. milage is 105663. The changeover took about 2 hours, the hardest was removing the small hose from the thermostat....get the right tool, my plyers we’re difficult.
I immediately noticed my temp gauge...it actually fluctuates, looking like all works well.
I will give mpg and overall satisfaction soon
I found it was easier to remove that small hose after I removed the thermostat housing from the block. But when the housing came off, the entire thermostat came apart. The two little plastic tabs were broken, so the spring wasn't being held and there was rust down in the sensor connection. So now I gotta buy another thermostat housing to do this job! Arrggghh.

Anybody have an idea where those two little plastic pieces might be? I wonder if I should be concerned...
 

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Wait.. how is this possible??? ;)

288624


And yes its 104 outside.
 

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You're in the first gen.cruze. That's how its possible. And your water temp dropped. That also happens. It's pretty common.
Your fan kick on is 233ish. Correct?

The second gen cruze does that also. Drops water temp. Fluctuates between 178 and 188. All cars fluctuate.

But they don't get that hot.

CHA CHING.

Any other quequestions?
 

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Yes, why did you edit your response? ;)
 

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They are most likely in the radiator end tank. There's literally thousands of Cruzes out there with same issue. No worries.
Yeah, as I was tracing the lines, I figured that was where they would end up.

I found one in the radiator water drain pan, but I'm sure it's too big to get out of the drain port at the bottom of the radiator, so it was probably still stuck in the thermostat housing and dropped into the drain pain when the whole thing sprung apart as I removed it.

Thanks!!
 

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OK, let’s start!
I had multiple Cruze cars since 2011, unfortunately I can’t say I have/had one free of issues! Talking about the heating and cooling, I saw different & multiple issues reported by people. I did many changes to my cars during the years and I’m going to share with you a few interesting things about the thermostat, specific for 1.4L turbo (ECO). It can be similar issues for other trims, even for Diesel, but the cars I tested & modified are Cruze ECO 2011-2012.
Based on testing 4 cars, here are my observations:
First, the “input data”:

  1. The OE Thermostat on Chevy Cruze ECO (1.4L turbo) from 2011 to 2016, is with a wax thermostatic element that starts opening at 105°C (221°F).
  2. The OE Thermostat is also wired and controlled by ECM. Based on different algorithms and program codes, the thermostat can open at any temperature at any time, if the ECM requires that!
  3. The water temperature display gauge is… a joke! I monitored it for different cars and compared with data from OBD. The dial moves when the temperatures increases until… until 185°F (85°C) only! Then stays there, right before 6 o’clock, no matter how high is the real water temperature. When I tested this, I changed the coolant concentration, adding much more water into the system and let the engine run until the water started boiling. The gauge was at the same position max position, telling me “everything’s ok!
View attachment 254945

4. The expansion OE tank cap is opening only at 20PSI.

Under all these conditions, the coolant temperatures during normal driving conditions stays around 220°-230°F. I said normal driving conditions because when the engine is overheating, the ECM controls and changes everything. It may open the shutter grille to help cooling down and also it can open the thermostat at any temperatures it “wants”, based on data collection. So, not only that you drive with coolant at high temperature, but also the entire system is at high pressure, since the tank cap opens over 20 PSI. In theory, a higher engine operating temperature helps improving its performances. Well, maintaining a higher temperature for the engine and cooling system requires also better quality system parts. Coolant’s boiling point is way too high under the condition I mentioned so everything is ok until… One small crack into the system will lower the PSI and of course the boiling point of your coolant. Add adding more water into the system and you will lower it even more until the coolant will start boiling time to time, without you notice it I replaced the recovery tank a few times, and many hoses all the time! Many others did the same things on this forum.
Sick of changing parts all year along I decided to change the thermostat and go “old school”. It took me a while until I found something that works but here is what I did. I bought a new thermostat housing 55593035Dorman 902-2080 (GM) that is for Cadillac ELR 2014 Chevy Volt 2011-2014. Do not buy MotoRad, it is a different new model, it will not work! You need the one with the “cage”, see the attachment. The housing is different from the outside, but the internal thermostat is fully compatible with Cruze’s thermostat housing. Push the cage and rotate as in my picture, then take out the spring and “cage”. The thermostat will come out relatively easy. It looks the same as the other one, only the wax inside is different and starts opening at 176°F (80°C). Be careful with the 2 legs, don’t bend them so they can go straight back into the housing.
I’ll not got into details of how to take out the existing thermostat, there are good posts on this forum. Put everything back, and make sure you have enough coolant. Then, old school again, I changed the tank cover with one that is opening at 15 PSI, not 20 PSI (MOTORAD T46 )!
I did this replacement on 6 ECO-s and these cars have between 500 to 3200 miles since. No issues at all! The temperature goes usually up to ~184°F then the thermostat is fully opened so the temperature goes down around 180°F. I didn’t notice any drastic changes to MPG! I have hot air blowing inside the car as I had before the swap.
I did all the changes I mentioned because me and my friends have multiple issues with the cooling system since 2011. If you like the solution and have questions, please let me know. I don’t want to argue with anybody about why GM built the system in the way it is so don’t challenge me! :p

View attachment 254953 View attachment 254961 View attachment 254969
Could you do a video of the two parts and changing the insides?
 

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Discussion Starter · #160 ·
See in the pictures what you need to replace. You can push against the spring with your hand but use a glove to protect your fingers.
 

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