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A/C not blowing cold air and code P0128

Tiny
DSHEAIRRA
  • MEMBER
  • 2015 CHEVROLET SONIC
  • 1.8L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 63,000 MILES
Hello, my car is having the same issues as someone else did with ac not blowing cold and giving me a p0128 code. What was the issue?
Tuesday, August 27th, 2019 AT 7:10 PM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

The 128 code is for a thermostat. It is stuck open and needs to be replaced. It has nothing to do with the A/C issue.

Do you have pressure gauges to give me the pressures?

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

Roy
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Wednesday, August 28th, 2019 AT 3:34 AM
Tiny
DSHEAIRRA
  • MEMBER
  • 4 POSTS
Well, there was another guy on here who had the same issue when you restart my battery the A/C blows cold again.
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Wednesday, August 28th, 2019 AT 9:17 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Did not see it in the history at all.

Roy
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Wednesday, August 28th, 2019 AT 9:19 AM
Tiny
DSHEAIRRA
  • MEMBER
  • 4 POSTS
I think this started a new question. I have a thermostat coming. I hope I find out what is causing it.
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Wednesday, August 28th, 2019 AT 9:40 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Can we start with your exact issue so I can help?

Roy
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Wednesday, August 28th, 2019 AT 12:04 PM
Tiny
DSHEAIRRA
  • MEMBER
  • 4 POSTS
Last week my A/C went out with no warning. Then a few hours later the p0128 came up on my car. I went to get it checked they said it is'nt really anything to worry about. Then when I reset the battery my A/C works fine then two days it goes out and the same code pops up shortly after.
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Wednesday, August 28th, 2019 AT 7:50 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The 128 code is for the thermostat in the engine. It is stuck open and the engine is not getting up to normal operating temperature.

I need the high and low side readings of the AC system while it is running.

Roy
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Thursday, August 29th, 2019 AT 2:13 AM

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