Can anyone give me a logical, rational, common since, reason - Chevy Traverse Forum: Chevrolet Traverse Forum
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post #1 of 39 (permalink) Old 11-14-2019, 07:27 PM Thread Starter
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Can anyone give me a logical, rational, common since, reason

why a A/C evaporator temp. sensor needs to be in my Traverse?? Besides the Co. explanation IE: "To take the system offline when the ambient temp. is below 40."




I SAY BALDERDASH, POPPYCOCK, AND HOGWASH..........Just something else to fail, and it will, and be replaced.


Vehicles have run, with A/C's, for millennia without these stupid sensors.......Right?



BTW, it ain't easy to get to either.

Last edited by srwa; 11-14-2019 at 07:31 PM.
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post #2 of 39 (permalink) Old 11-14-2019, 08:14 PM
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Originally Posted by srwa View Post
why a A/C evaporator temp. sensor needs to be in my Traverse?? Besides the Co. explanation IE: "To take the system offline when the ambient temp. is below 40."




I SAY BALDERDASH, POPPYCOCK, AND HOGWASH..........Just something else to fail, and it will, and be replaced.


Vehicles have run, with A/C's, for millennia without these stupid sensors.......Right?



BTW, it ain't easy to get to either.
Wrong. In the past, no one ran their AC when it was 40 deg. Nowadays, with "automatic temperature controls," the AC runs all the time to remove moisture. So now they need the ambient temperature sensor to turn it off below 40 deg F.

https://www.gmpartsdepartment.com/oe...bC12Ni1nYXM%3D
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File Type: gif Ambient Air Temperature Sensor location.gif (27.5 KB, 13 views)

2011 2LT FWD replaced by 2017 2LT AWD
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post #3 of 39 (permalink) Old 11-14-2019, 09:21 PM Thread Starter
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Originally Posted by greentraverse View Post
Wrong. In the past, no one ran their AC when it was 40 deg. Nowadays, with "automatic temperature controls," the AC runs all the time to remove moisture. So now they need the ambient temperature sensor to turn it off below 40 deg F.

https://www.gmpartsdepartment.com/oe...bC12Ni1nYXM%3D

RIGHT!


Have a 97 Plymouth Grand Voyager with 2 evaporator cores, IE: 2 A/C'S in it, with 285k on it. Have put 1 1/2 cans 134A in it; thats all. System puts out 50 degree air when ambient is 101.


Why has it lasted so long? Main reason is on every COLD start the compressor comes on for approx. 15 to 20 seconds, thus lubeing the seals & O rings. And also, it don't matter what the temp. is when the A/C is in defrost mode the compressor is running..........WHY? to dry the stupid windshield out so it'll defrost.
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post #4 of 39 (permalink) Old 11-14-2019, 09:33 PM Thread Starter
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A/C 's 101


There is no difference between residential a/c and a car a/c. Say on a 3 ton residential a/c 1 ton is doing "latent" work IE: removing moisture(humidity). One can translate that to say that 1/3 of the tonnage on all residential a/c's is for moisture control. Their sized with that in mind.


Have 2000 sq. ft. home with a 4 ton heat pump. When the temp. is below 98 and the humidity is high the unit is removing several gallons /hr. out of the house. It runs like an open faucet.

Last edited by srwa; 11-14-2019 at 09:40 PM.
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post #5 of 39 (permalink) Old 11-14-2019, 10:16 PM
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In my house when the humidity is a muggy 65% my ac can turn my number to 52% in less than half an hour. Who can sleep with a humidity higher than 60%. Not me.

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post #6 of 39 (permalink) Old 11-15-2019, 12:20 PM
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Originally Posted by srwa View Post
why a A/C evaporator temp. sensor needs to be in my Traverse?? Besides the Co. explanation IE: "To take the system offline when the ambient temp. is below 40."




I SAY BALDERDASH, POPPYCOCK, AND HOGWASH..........Just something else to fail, and it will, and be replaced.


Vehicles have run, with A/C's, for millennia without these stupid sensors.......Right?



BTW, it ain't easy to get to either.
It's right in the lower grille and like 15 bucks to replace. Small cost to potentially extend the life of a $500 compressor.

FWIW more than one professional HVAC tech has told me to avoid running my 4 ton residential unit below 50F. I like to test fire early in the spring so I don't end up with no AC on the first hot day.

2017 Traverse LT2
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post #7 of 39 (permalink) Old 11-15-2019, 04:51 PM Thread Starter
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Originally Posted by nhrata01 View Post
It's right in the lower grille and like 15 bucks to replace. Small cost to potentially extend the life of a $500 compressor.

FWIW more than one professional HVAC tech has told me to avoid running my 4 ton residential unit below 50F. I like to test fire early in the spring so I don't end up with no AC on the first hot day.

Wrong sensor, the a/c sensor is located in the evaporator core and it ain't easy to get to,hence it's expensive to replace....If, your not a DIY.
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post #8 of 39 (permalink) Old 11-15-2019, 05:14 PM Thread Starter
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Originally Posted by nhrata01 View Post
It's right in the lower grille and like 15 bucks to replace. Small cost to potentially extend the life of a $500 compressor.

FWIW more than one professional HVAC tech has told me to avoid running my 4 ton residential unit below 50F. I like to test fire early in the spring so I don't end up with no AC on the first hot day.

Also, my unit is a heat pump which does the heating in winter. The pump will work fine down to 40 degree sometimes in the high 30's degrees. Then the strips take over. My unit has 4 - 5kw heat strips.which 2 come on at a time, depending on the outside temp.


A heat pump is nothing but an a/c unit with reversing valves.........a little more complicated than that. In heat mode it takes the outside air, extracts the heat out, yes there is "heat" in 40 degree air and above, and moves it inside the dwelling.


Why a heat pump? At 4 to 5 kw it's much more efficient to use than electric strips alone.Especially at $.10cents/kwh and above.
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post #9 of 39 (permalink) Old 11-15-2019, 05:19 PM Thread Starter
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Originally Posted by Capucine View Post
In my house when the humidity is a muggy 65% my ac can turn my number to 52% in less than half an hour. Who can sleep with a humidity higher than 60%. Not me.



Capucine;


"Ideal" relative is 45%; above 55 its muggy, swamp conditions...........like Congress..( My Man is fixing that)


Below 35%, how dry I am.

Last edited by srwa; 11-15-2019 at 05:21 PM.
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post #10 of 39 (permalink) Old 11-15-2019, 07:00 PM
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Originally Posted by srwa View Post
Wrong sensor, the a/c sensor is located in the evaporator core and it ain't easy to get to,hence it's expensive to replace....If, your not a DIY.
The OP first talked about the evaporator sensor, but then talked about it shutting off the AC for low ambient temperature. It's my understanding that the evaporator sensor will shut off the AC if the evaporator freezes up (this sensor and its use is very common in RV AC units, for example). BUT: I would assume it's the ambient air temperature sensor that prevents it from running with low ambient air temperature.

You can see in the attached diagram that both sensors are used.

So I guess we don't know which sensor he's actually talking about.
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File Type: gif AC sensors.gif (33.1 KB, 6 views)

2011 2LT FWD replaced by 2017 2LT AWD

Last edited by greentraverse; 11-15-2019 at 07:05 PM.
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