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2014 Silverado Evaporator Temp.Sensor location (Update!)

BRGCobra

By BRGCobra
in Troubleshooting & Recalls

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BRGCobra Enthusiast

BRGCobra

Posted
Posted (edited)

2014 Silverado 4.3 V6 WT

 

I`ve been having intermittent AC issues. (haven`t we all. LOL!!)

And it`s the middle of July in Texas!!!!! ?
My AC will blow cold then transition to cool/warm. It`ll stay cool/warm for a while then maybe go back cold again.
When the compressor clicks on, I can feel cold air in the cab.

 

I took it to a shop (not dealer) and they didn`t detect any leaks. System is holding a charge and the low pressure line will get cold.
I was told it`s either an expansion valve or the evaporator temp sensor.

Expansion valve replacement was the cheaper of the 2.
I had the valve replaced (I don`t have A/C recovery equipment) and the issue still persists.

 

Evaporator temp sensor sends a signal to the compressor to kick on. It`s there to make sure if the evaporator turns into a block of ice it wont destroy the compressor.

The shop said evap. temp. sensor replacement was 9 hours on the books at $100 hr. labor due to having to remove the whole dash.
I don`t wanna get raped $1K for a $15 part.

I`ve already pulled the upper and lower glove box assy. off hoping to get a looksie inside and see if I can see where this temp sensor is. No luck.
I have NO ISSUE cutting a hole into some plastic to get that sensor out instead of having to pull the whole dash.
Do I have to pull the center console/radio out to get to it? Do I remove the pass. air bag?

I can`t find ANYTHING online that shows where this thing is.  The gmpartsdirect diagram is pretty vague.
I know what the part looks like. I just need to find where it is.


 

Edited by BRGCobra
Updated
BRGCobra Enthusiast

BRGCobra

Posted
  • Author
Posted

Thought I`d post an update to my dilemma.

I replaced the evaporator temp sensor and it didn`t fix my intermittent issue.

(For those of you wondering where that sensor is, pull the lower glove box and you`ll see a vertical bar code sticker on the front of the heater box. Right next to that sticker you`ll see 2 wires going into a sensor. That`s it right there. You DO NOT have to pull the dash.)

 

I decided to throw in the towel and took my truck to the dealership. I gave the service writer super detailed notes of what`s been replaced and what I`m experiencing.
He called a few hours later and said the tech found several codes relating to the ac compressor not receiving signal/kicking on. I was told it`s a broken electrical connection somewhere the tech would have to chase down. Book listed 3 hours for the job.

 

I got another call a few hours later saying the truck was done. Turned out to be a broken wire/bad connection at a pressure valve. (Didn`t say if it was on the low or high pressure side)

My truck also needed that brake vacuum pump/belt recall done also. (I never noticed any issues pertaining to that)

 

In case you`re wondering, that was a $540 dealer visit.

If you`re having intermittent issues, check your pressure valve(s).

 

  • Like 1
  • 11 months later...
Wsn24 New Member

Wsn24

Posted
Posted

Thank you for the topic and the update you really helped me diagnose my problem as I was ready to replace the evap temp sensor and the high pressure switch but now I could see the problem

  • 2 years later...
Pesco Electric Inc New Member

Pesco Electric Inc

Posted
Posted

Sooo ... I'm looking to replace the evap temp sensor in my 2018 Silverado. I found two wires next to the vertical bar code sticker going into the heater box, as you described. They just go through a rubber grommet though - there's no connector visible. This is the sensor?  How did you actually change it? Did you cut into the heater box?

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