Didn't you have a thermostat replacement recently? Do you recall the temp gauge reading before the change?
Coolant temperature fluctuation ?
I have been driving with the Coolant Temperature digital readout displayed on the DIC of my 2020 3.6L XT5 for the past 6 months.
The thermostat is 194* and I expect the operating temperature should stay close to that. Mine, however, reaches 190-192 and then in a short amount of times, less than a mile, drops as low as 176 and then hovers around 180. It rarely climbs to the high 180's and then drops back down to 180 or less.
Curious what others are seeing?
The thermostat is 194* and I expect the operating temperature should stay close to that. Mine, however, reaches 190-192 and then in a short amount of times, less than a mile, drops as low as 176 and then hovers around 180. It rarely climbs to the high 180's and then drops back down to 180 or less.
Curious what others are seeing?
21 - 35 of 35 Posts
Yes. It was bottomed out at 160* and never came up higher until the thermostat was replaced.Didn't you have a thermostat replacement recently? Do you recall the temp gauge reading before the change?
210* seems to be my normal warmed up engine temperature.I’ll check it again today.
That's normal.Where my temp gauge usually runs, can't find a digital display in my DIC...
View attachment 630722
The good news is it sounds like the thermostat is sticking in the open position, allowing owners to still drive the vehicle. As opposed to a normal thermostat sticking closed and overheating the engine.
Took my XT5 to the dealer on Feb 7 complaining that the Coolant Temperature warms to 190* and then drops to 176*. Dealer would not do anything because there are no codes. Service department did not know the conditions to set PO128 for thermostat. Pushed Service Writer for better definition and he gave me the number for GM Customer Service.
Contacted the number provided and they transferred me to Cadillac Customer Care who opened a case on Feb 8. It took until Feb 23 for a Senior Advisor called back. He agreed to contact another dealer to find the answer to the question about PO128.
On Feb 28, the Senior Adviser reported the normal operating range is 195* - 205*. With mine running at 176* he suggested and setup an appointment with a different dealer. I asked which dealer he asked about the operating range and he said it was my original dealer.
That same day, I called the Service Writer and advised him that I have an appointment at a different dealer and asked him why someone at his dealership told the Senior Advisor the normal range is around 195* and they would not do anything about it. He gave the expected excuse that Cadillac will not pay them if there are no codes and perhaps a second opinion is worthwhile. Told him if the other dealer takes care of me, that will be my dealer and I will not be back for sales or service.
In less than 1/2 hour he called back and said he talked with a more senior technician who told him they should change the thermostat. He said they would like to make another attempt to repair and would order a new thermostat that same day so it is available when I return. I agreed to give them one more chance.
Called March 10 because I had not heard anything and found the Service Writer was on vacation, but the part was there. Made an appointment for March 15.
March 15, talked with the Service Writer first and asked why I was not called when the part arrived, he said he was on vacation. Told him I should have been called if he was there or not and asked when the part arrived. He never did tell me how long the part was there.
The thermostat was changed that day in 1 1/2 hours. The Coolant Temperature now rises to 194* in half the time and half the distance than before. It will drop to 192* for a couple seconds, then rise to 194* quickly. The temperature will rise to slightly above 200* if stopped, but that is OK. The thermostat is now operating as I expect it should.
It is unfortunate dealerships hire Service Writers who do not hesitate to lie, even when Cadillac is paying for the work.
Contacted the number provided and they transferred me to Cadillac Customer Care who opened a case on Feb 8. It took until Feb 23 for a Senior Advisor called back. He agreed to contact another dealer to find the answer to the question about PO128.
On Feb 28, the Senior Adviser reported the normal operating range is 195* - 205*. With mine running at 176* he suggested and setup an appointment with a different dealer. I asked which dealer he asked about the operating range and he said it was my original dealer.
That same day, I called the Service Writer and advised him that I have an appointment at a different dealer and asked him why someone at his dealership told the Senior Advisor the normal range is around 195* and they would not do anything about it. He gave the expected excuse that Cadillac will not pay them if there are no codes and perhaps a second opinion is worthwhile. Told him if the other dealer takes care of me, that will be my dealer and I will not be back for sales or service.
In less than 1/2 hour he called back and said he talked with a more senior technician who told him they should change the thermostat. He said they would like to make another attempt to repair and would order a new thermostat that same day so it is available when I return. I agreed to give them one more chance.
Called March 10 because I had not heard anything and found the Service Writer was on vacation, but the part was there. Made an appointment for March 15.
March 15, talked with the Service Writer first and asked why I was not called when the part arrived, he said he was on vacation. Told him I should have been called if he was there or not and asked when the part arrived. He never did tell me how long the part was there.
The thermostat was changed that day in 1 1/2 hours. The Coolant Temperature now rises to 194* in half the time and half the distance than before. It will drop to 192* for a couple seconds, then rise to 194* quickly. The temperature will rise to slightly above 200* if stopped, but that is OK. The thermostat is now operating as I expect it should.
It is unfortunate dealerships hire Service Writers who do not hesitate to lie, even when Cadillac is paying for the work.
After a cold start my temp will rise to about 194* and then fluctuate between that and 180*. When it hits 180* the temp gauge will then drop down to 3 bars instead of the normal 4 bars (my 2020, like yours, uses bars instead of a needle gauge). When it rises to 183* it will go back up to 4 bars. At my next oil change I will bring this up to my Service Writer.Took my XT5 to the dealer on Feb 7 complaining that the Coolant Temperature warms to 190* and then drops to 176*. Dealer would not do anything because there are no codes. Service department did not know the conditions to set PO128 for thermostat. Pushed Service Writer for better definition and he gave me the number for GM Customer Service.
Contacted the number provided and they transferred me to Cadillac Customer Care who opened a case on Feb 8. It took until Feb 23 for a Senior Advisor called back. He agreed to contact another dealer to find the answer to the question about PO128.
On Feb 28, the Senior Adviser reported the normal operating range is 195* - 205*. With mine running at 176* he suggested and setup an appointment with a different dealer. I asked which dealer he asked about the operating range and he said it was my original dealer.
That same day, I called the Service Writer and advised him that I have an appointment at a different dealer and asked him why someone at his dealership told the Senior Advisor the normal range is around 195* and they would not do anything about it. He gave the expected excuse that Cadillac will not pay them if there are no codes and perhaps a second opinion is worthwhile. Told him if the other dealer takes care of me, that will be my dealer and I will not be back for sales or service.
In less than 1/2 hour he called back and said he talked with a more senior technician who told him they should change the thermostat. He said they would like to make another attempt to repair and would order a new thermostat that same day so it is available when I return. I agreed to give them one more chance.
Called March 10 because I had not heard anything and found the Service Writer was on vacation, but the part was there. Made an appointment for March 15.
March 15, talked with the Service Writer first and asked why I was not called when the part arrived, he said he was on vacation. Told him I should have been called if he was there or not and asked when the part arrived. He never did tell me how long the part was there.
The thermostat was changed that day in 1 1/2 hours. The Coolant Temperature now rises to 194* in half the time and half the distance than before. It will drop to 192* for a couple seconds, then rise to 194* quickly. The temperature will rise to slightly above 200* if stopped, but that is OK. The thermostat is now operating as I expect it should.
It is unfortunate dealerships hire Service Writers who do not hesitate to lie, even when Cadillac is paying for the work.
If you need the GM Customer Service number I used, let me know.After a cold start my temp will rise to about 194* and then fluctuate between that and 180*. When it hits 180* the temp gauge will then drop down to 3 bars instead of the normal 4 bars (my 2020, like yours, uses bars instead of a needle gauge). When it rises to 183* it will go back up to 4 bars. At my next oil change I will bring this up to my Service Writer.
Can you provide me with that Customer Service number as I would like to discuss this possible thermostat issue with them. Thanks.If you need the GM Customer Service number I used, let me know.
I will PM the number.Can you provide me with that Customer Service number as I would like to discuss this possible thermostat issue with them. Thanks.
I can't find anywhere when I search the LGX engine specs on what temperature thermostat that engine comes with. Can someone direct me on where it states the actual thermostat temp specs?
The thermostat used in the XT5 is 194*. Normal operating temperature is 195* to 205*.I can't find anywhere when I search the LGX engine specs on what temperature thermostat that engine comes with. Can someone direct me on where it states the actual thermostat temp specs?
I can't find anything that actually states that.
I found it stated somewhere but cannot think of it right now. If I find it, I will post it.
21 - 35 of 35 Posts
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