AC stops blowing cold and temperature gauge quits working at the same time

2008 CHEVROLET MALIBU
109,000 MILES • 2.4L • 4 CYL • 2WD • AUTOMATIC
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KATYC305
  • MEMBER
  • 3 POSTS
While driving or just starting the car the AC will stop blowing cold and then the temperature gauge stops working. We have replaced the thermostat and the ECT sensor. After changing the ECT sensor it starting working for about 60 miles then it did the same thing. What could be going on?
Jun 16, 2019 at 11:26 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

When you replaced the ECT, did the car start blowing cold air again?

https://www.2carpros.com/articles/low-or-no-air-flow-from-vents

Can you tell me the high and low side pressure readings of the AC system?

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

Are there any codes set?

Roy
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Jun 16, 2019 at 8:15 PM
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KATYC305
  • MEMBER
  • 3 POSTS
Yes.
Jun 18, 2019 at 3:22 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Yes to what?

Roy
Jun 18, 2019 at 4:50 AM
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KATYC305
  • MEMBER
  • 3 POSTS
Sorry. Yes, when we changed the ECT and thermostat the AC started blowing cold again. It stayed on for awhile then after the car was sitting for awhile when I got back in it to leave the temperature gauge wouldn't work and the AC was blowing hot again and the fans kicked on instantly.
Jun 18, 2019 at 6:12 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Okay, can you give me the high and low side readings?

Roy
Jun 18, 2019 at 6:32 AM
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