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Shows on warning display engine hot A/C turned off

Tiny
CASPER1115
  • MEMBER
  • 2007 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 165,000 MILES
Last year had thermostat replaced, this year coolant sensor replaced. Worked for a few weeks, the other day warning came on again. But vehicle is not getting hot, disconnected battery cable and it cleared it, tonight have not driven it all day started up and immediately warning came on after five seconds.
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Saturday, September 15th, 2018 AT 8:52 PM

7 Replies

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

What was the code that was set? Clearing does absolutely nothing as the issue needs attention and repair.

The AC is disabled when the engine temperature gets too high. That is built into the strategy of the software in the truck.

Roy

https://www.2carpros.com/articles/symptoms-of-an-overheating-engine

https://www.2carpros.com/articles/engine-overheating-or-running-hot
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Sunday, September 16th, 2018 AT 5:04 AM
Tiny
CASPER1115
  • MEMBER
  • 4 POSTS
Started this morning warning came on for two seconds went off. Code showed po174 intermittent.
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Sunday, September 16th, 2018 AT 7:43 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
That is a code for lean running. Has nothing to do with your issue.

Roy

171

P0171
Descriptor
Probable Causes
Air Intake System
Crankcase Ventilation System Leak
Engine Mechanical Condition
Evaporative Emission (EVAP) Canister
Evaporative Emission (EVAP) Pipes, Lines and Hoses
Exhaust Leak
Fuel Injector
Fuel Injector O-Rings Vacuum Leak
Fuel Level Low
Fuel Pressure Low
Fuel Quality
Heated Oxygen Sensor (HO2S)
Heated Oxygen Sensor (HO2S) Signal Circuit Open or Shorted to Ground or Low Reference Circuit
Intake Manifold Vacuum Leak
Vacuum Hose/Line
Vacuum Leak
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Sunday, September 16th, 2018 AT 7:53 AM
Tiny
CASPER1115
  • MEMBER
  • 4 POSTS
What would cause the engine hot A/C off warning display sometimes?
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Sunday, September 16th, 2018 AT 9:35 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
As I stated before it is due to the engine running hot.

You need to find the reason for the engine running hot. Once you do that and repair it the message will stop appearing.

Roy
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Sunday, September 16th, 2018 AT 9:47 AM
Tiny
CASPER1115
  • MEMBER
  • 4 POSTS
Like last night SUV sat all day went to move it last night and immediately warning light came on. Surely it did not overheat in five seconds, this morning drove twenty miles perfect.
Thanks for your help.
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Sunday, September 16th, 2018 AT 9:59 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, then we need to see the high and low side gauge readings of the A/C system with it running.

The pressures may be off causing the issue but need those readings.

Roy
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+1
Sunday, September 16th, 2018 AT 10:11 AM

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