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Dash Reads: Engine Hot A/C Off

Tiny
JAX34
  • MEMBER
  • 2010 CHEVROLET IMPALA
  • V6
  • FWD
  • AUTOMATIC
  • 75,000 MILES
Today my dash read: engine hot a/c off after about 5-8 miles or so, what could it be the engine overheating it doesn't seem like it though?
Friday, November 7th, 2014 AT 3:29 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
Was the engine overheating? if not I have seen the engine temperature sensor intermittently short out causing the is problem here is a guide to help see if the engine is overheating and how to fix it with the engine coolant temperature sensor location in the diagrams below.

https://www.2carpros.com/articles/engine-overheating-or-running-hot

Check out the diagrams (Below). Please let us know what you find. We are interested to see what it is.
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Friday, November 7th, 2014 AT 6:26 AM
Tiny
JAX34
  • MEMBER
  • 2 POSTS
I was going about 55-60mph on the open road highway, the engine was not over heating, everything seems fine, I didnt see any smoke nor smelled any inaccurate odors, the engine sounded fine also, the only thing that bothered me was that the temp meter was all the way down to C it usually moves up a little when driving.
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Friday, November 7th, 2014 AT 7:01 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,772 POSTS
Most likely the temp sensor it bad.
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Saturday, November 8th, 2014 AT 6:45 PM
Tiny
JAMES567365
  • MEMBER
  • 0 POST
Thank you for this post I had this problem and had to get a new coolant temperature sensor for 56.00 all fixed! This site rocks water back :)
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Saturday, August 17th, 2019 AT 2:25 PM
Tiny
LIZANDERSEN
  • MEMBER
  • 1 POST
  • 2007 CHEVROLET IMPALA
  • 3.5L
  • V6
  • FWD
  • AUTOMATIC
  • 53,600 MILES
Every once in awhile engine hot a/c off comes on and the heat gauge quits working when this happens, have to unhook the battery to reset it and then it works fine again, I put a new ECT sensor in, could it be the thermostat
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Saturday, August 17th, 2019 AT 2:26 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No clean the grounds on eh engine an dbattery to body and battery terminal ends first see if that fixes it.
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Saturday, August 17th, 2019 AT 2:26 PM (Merged)
Tiny
KAMARIA CLARK
  • MEMBER
  • 2 POSTS
  • 2007 CHEVROLET IMPALA
  • V6
  • 4WD
  • AUTOMATIC
  • 100,000 MILES
I replaced the radiator because it was leaking and then it started overheating so I found out that the reservoir bottle had a hole in it so I replaced it, filled it up will fluids and drove it home which is like five miles approximately and the liquids in the reservoir bottle was boiling and the temperature gauge was above the halfway point. I do not see any leaks under the car. So I am at a stand still as to what could be the problem now. Any help would be appreciated. Also, when I turn the air conditioner on it gets cold and works for a few minutes then it cuts off.
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Saturday, August 17th, 2019 AT 2:26 PM (Merged)
Tiny
KAMARIA CLARK
  • MEMBER
  • 2 POSTS
You can reach out to me with any questions.
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Saturday, August 17th, 2019 AT 2:26 PM (Merged)
Tiny
CARADIODOC
  • MECHANIC
  • 33,879 POSTS
Wait with the air conditioner problem for now. It is likely to be related to the overheating.

The first issue is if the cooling system needs to be burped. Look for a bleeder screw on the thermostat housing. If there is not one, look for a plug or temperature sensor on or near the housing that can be unscrewed. If it is a sensor that you unscrew, do not turn on the ignition switch while the sensor is unplugged to prevent setting a diagnostic fault code.

If burping the system does not solve the overheating, have your mechanic perform a chemical test for a leaking cylinder head gasket.
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Saturday, August 17th, 2019 AT 2:26 PM (Merged)

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