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Hello all, my 2014 will be at normal operating temperature and occasionally the temperature gauge will drop to the bottom of the scale and the fans turn on and then the AC will stop blowing cold air. If I shut it off for 30 seconds or so. It will then go back to normal once I restart it. Then it’ll happen again a short time later. Codes that are being set are P0118 and P0119. My guess is the ECT sensor is the culprit but maybe it’s something else? One other thing I have noticed is the lower radiator hose at the thermostat housing will be cool to the touch, when the fans are running like the thermostat is stuck closed not allowing the coolant to circulate. I have changed the thermostat, but that did not solve the problem.
 

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Any Luck?

Oddly enough, my wife's 2014 Acadia started doing this exact thing this week. Went left the house and within a block the a/c died. Came back home, shut off the engine and the fans were on full blast after the engine shut down. We gave it a few seconds, started it back up, and everything worked.

A few days later she called me and said her a/c died again and that her temp gauge was at the bottom (this was after about 30 mins of driving). When she got home, I put in a new thermostat. Drove it around for about 10 mins and the car stayed at 210 on the gauge (as it should) and the a/c worked fine. This lasted for 2 days and then it went back to dropping the water temp, killing the a/c.

My thoughts are of course electrical. The temp gauge can't fluctuate that drastically without it being some sort of circuit/relay/sensor issue. I think something is throwing a bad voltage, confusing the car and it is dropping the a/c; just like it does when the car gets too hot, except this isn't a 'too hot' issue.

Let me know if anyone has found out anything, I plan to call the dealership today. We purchased this new in 2014.

-Steven
 

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Yes, my 2014 Acadia was doing the same thing, when temp gauge would drop the a/c would quit.
after ready a couple online post on how the system operates, this is what I see. when the temp gauge drops the controller does not know what temp the engine is so it goes into protective mode. It turns the a/c off in case the outside temp is below freezing to protect the compressor from damage. It also turns on both cooling fans in case the engine is overheating. This is why the fan turns on and may run after the car is turned off. With the temp sender being the possible cause I decided to replace it. The sender is located on the front side off the front head between the #2 and #4 cylinders, under a silver protective cover. When changing the sender out I did not want to have to drain the coolant, so in removed the filter and dumped the dirt out of my shop vac. and placed the hose over the radiator fill neck on radiator and held a vacume while i replaced the sender. this did suc about 1/2 gal of coolant out which I topped off with new coolant. I took the car for a test drive and the temp gauge worked like it was supose to and the a/c cool again!!!
 

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Anybody figure it out

My 2014 GMC Acadia Just started do the same exact thing!! Temp gauge drops to straight down, Fan blowing full and loud, A/C still Blows but Not cold and the recirculation button flashes. Kind of odd that it is the 2014's that have started doing this. Another way for GMC to make up spend money.

Hope someone figures it out and it is an easy fix. Please Share if you do!!
 

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My wifes 2019 Acadia just did this today. Going to check the sender and see if thats the fix on this model as well
 

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Yes, my 2014 Acadia was doing the same thing, when temp gauge would drop the a/c would quit.
after ready a couple online post on how the system operates, this is what I see. when the temp gauge drops the controller does not know what temp the engine is so it goes into protective mode. It turns the a/c off in case the outside temp is below freezing to protect the compressor from damage. It also turns on both cooling fans in case the engine is overheating. This is why the fan turns on and may run after the car is turned off. With the temp sender being the possible cause I decided to replace it. The sender is located on the front side off the front head between the #2 and #4 cylinders, under a silver protective cover. When changing the sender out I did not want to have to drain the coolant, so in removed the filter and dumped the dirt out of my shop vac. and placed the hose over the radiator fill neck on radiator and held a vacume while i replaced the sender. this did suc about 1/2 gal of coolant out which I topped off with new coolant. I took the car for a test drive and the temp gauge worked like it was supose to and the a/c cool again!!!
Is the temperature sender the same thing as the temperature sensor?
 
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