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Chevy Impala 9th Gen Discussion Epsilon II 2014+. Discuss all Chevy Impala 9th Generation Performance and Technical Discussion here.

Thread: V6 Engine over-cooling? What is the "normal" temperature to run at? Reply to Thread
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  Topic Review (Newest First)
08-19-2019 08:23 PM
laohu586 Thanks all for the responses, I definitely feel a bit better now.
08-08-2019 05:05 PM
different dealer

took the car to a different dealer, they agreed , dash gauge is sluggish, and does not show warmer temps, ( like 205 on DIC)
but is within parameters,
we have 20 or so of these in the county fleet, and none over heat, or even come close, so won't worry about it,

yes , it causes concern , but not gonna let it bother the nice ride the car is,
we went to PHX earlier this week and for 470 mi, averaged 34 mpg,

on another note.
windshield is de laminating, has mini bubbles all thru out the windshield, makes night driving fun, like driving in the rain, with NO wipers.
new dealer said they expect to replace windshield. (waiting approval)
08-04-2019 12:31 PM
sidemouse With an OBD scanner running mine reads just over 200F while driving, normal op temp. but I will say this... On my 2013 GMC if there is any kind of thermostatic failure (yes even too cool) the "engine hot a/c off " light will come on (you read that right, too hot OR too cool), this is instantly noticeable in summer as the car does in fact shut the a/c off... I would imagine this behavior to exist in Impalas as well and it is sensitive, even the wrong temperature thermostat will set it off.

How I found out, I switched from a 180-degree to a 170 one on my GMC.
Again I'm sure the behavior would be there on Impalas so my attitude with this is if it runs, don't fix it.

Also you can turn on your heat at full blast and so long that is coming out the vents HOT I wouldn't worry further.
08-03-2019 07:43 AM
laohu586 Hey man, I have the same exact issue with my 2017 impala v6, did you ever figure out the root cause?
07-18-2019 05:04 PM
after being at the dealer 5 days

still there, dealer calls , says thats normal, for temp needle not to move, it does go to cold position, then as it warms. it goes to 1/3 position,
even when DIC reads 205, needle is still 1/3,
I took pics to show dealer, they weren't concerned,

so I went to same dealer, looked at a new impala, started it and watched the temp needle climb, sitting there, a/c on, scrolled to DIC. and temp gauges went up as DIC did,
SO, ITS OBVIOUS this dealer is full of shit,

wow, thought they weeded out the flaky dealers,
07-17-2019 08:16 PM
Originally Posted by olddog View Post
my 2018 temp gauge never moves beyond 1/3, mark
never ever gets to 1/2, so ;looked at temp in the DIC.
avg 180, up hill ,ac on, 115 out side, temp got to 205, but gauge still shows 1/3,
its now at the dealer, along with pics of gauge and DIC readout,
suspect temp sender?
Not sure about the sender. As far as I know, there is only one temp sensor for the LFX 3.6L V6. So the same source data supplies both the DIC and the gauge.

I tried to find a detailed explanation for the gauge operation, but struck out.


07-17-2019 06:20 PM
2018 temp gauge

my 2018 temp gauge never moves beyond 1/3, mark
never ever gets to 1/2, so ;looked at temp in the DIC.
avg 180, up hill ,ac on, 115 out side, temp got to 205, but gauge still shows 1/3,
its now at the dealer, along with pics of gauge and DIC readout,
suspect temp sender?
07-10-2019 09:22 AM
Fast Eddie
it will run at 179

mine swings right through 179 210 sniffing somebody's tailpipe back down to 186 in park 89F to 95F
11-08-2015 10:31 AM
baabootoo Last night, while in the 30's, I had been driving around for hours. It sat around 175 which seems a little low; to me anyway. I still have to adjust the temp control from 78 down to 66 over time to stay comfortable.
11-06-2015 11:01 AM
baabootoo I asked this same thing a month? ago, since I thought that the thermostats have been 195 for a few years, but I guess not now. Mine sits at 181 after it stabilizes. There IS something weird abut the HVAC, and seems to need a higher temp for the defrost as opposed to the vent to get the same warm air. Plus, when you reduce it one or two degrees(NOT in "AUTO" mode), it blows cold air for a little (defrost).
11-06-2015 06:41 AM
jtrosky Hopefully, someone that owns a 9th gen will chime in - I'm just basing my info on the way my 8th gen (and previous cars) worked. Maybe the 9th gens operate differently.... I'm sure a 9th gen owner will chime in soon enough with more concrete info!

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11-06-2015 06:32 AM
chevy.million.mike It helps me alittle bit because when i bought the car i can swear i remember them being on. I have had the car now for 6 days and those lights don't seem to turn on at all whether night or day. They only turn on when i remote start the car but, when i get in it and confirm the ignition they turn off. I have 14 1ltz. Maybe I'll will need to post pictures to get better help. I appreciate your time!
11-06-2015 06:17 AM
jtrosky I'm not sure about the 9th gens, but typically, that light is on with the headlights or parking lights. It wouldn't normally be on with the Daytime Running Lights though... Does that help?

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11-06-2015 06:09 AM
chevy.million.mike Im very curious about how the turn lamps on my impala are suppose to work. Are they suppose to be steadily on at any point or is it only for signaling the turn? I did start a post about this but i looked through all 39 pages of the 9th gen but see no answers. It's driving me crazy. I have the impression that they are suppose to be on constantly while the car is turned on and in motion. Am i right or wrong?
11-06-2015 05:09 AM
jtrosky 202F is not anything to worry about. Even in the winter, my coolant can reach temps over 200F.

According to the stock tune file for my 2012, it looks like the cooling fan doesn't even kick on until the coolant reaches 210F (44% fan) - unless using A/C - when A/C is on, at least one of the fans is always running.

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