Question about 2006 Chevrolet Cobalt

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COBALT TEMP GAUGE READS 250 DEGREES BUT ENGINE RUNNING COOL REPLACED COOLANT TEMP SENSOR AND STILL GAUGE GOES TO 250 DEG

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  • ANNEBRAZE499 Jul 30, 2009

    ENGINE COMPUTER THINKS ITS HOT AND RUNS IN SAFE MODE NEVER OVERHEATED AT ALL

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  • Master
  • 521 Answers

Flash program of the ECM. Contact your local dealership and see if one is required/offered. Some minor electrical problems are fixed this way. Its basically the eqivalent of the automatic updates your computers to keep itself running correctly and such.

Posted on Aug 04, 2009

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  • Master
  • 631 Answers

Probably the temp gauge itself. Most of the time it doesn't have a problem but sometimes they do go bad. Did the car ever overheat prior to changing the solenoid?

Posted on Jul 30, 2009

  • outdoorsman5
    outdoorsman5 Jul 30, 2009

    Well about the only thing left is the gauge then.

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1 Answer

Cooling fans don't come on when my temperature gauge goes to the middle but I ran straight power for the cooling fans and it works I tried replacing the relays but nothing worked


Well then the engine isn't hot enough ! The engine computer will turn on the fans when the coolant temp sensor tells the PCM/ECM the temp is 212 degrees . Does the temp go into the red ? If no don't try an read problems in that aren't there .

Oct 25, 2016 | Cars & Trucks

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Why does the temperature gauge on my 1995 Chevy K2500, 5.7L read 150 degrees ?


If you replaced the SENSOR and not the gauge SENDER, there's your answer.

The SENSOR sends the computer (ECM, PCM, ECU, etc.) the engine temp so it can make the adjustments to the fuel, timing etc.

The gauge SENDER makes the gauge read what temperature the engine coolant is.

Hope the helps.

Feb 21, 2015 | 1995 Chevrolet K2500

3 Answers

I HAVE DONE EVERYTHING FROM ENGINE HEAD CHECK PRESSURE TEST RADIATOR REPLACEMENT, THERMASTAT REPLACEMENT, WATERPUMP REPLACEMENT. THE COOLING FANS KICK IN, AND THE CAR STILL RUNS HOT ...WHAT'S NEXT?


ok , but no engine stated. which one>??
hot = lying dash gauge or real hand held pyro IR gun? a $20 tool.
did the scan tool ECT reading show too hot, Yes/no.

no new cap, really?
is the cam timed right?
is the spark timed right.?
is the ECU stuck in limphome mode? (huge heat to cylinder walls)
thermostat not upside down.
or thermostat not with bleed hole up hill trapping air below
making it lie and the dash gauge lie too, (the gauge can not measure air, period)

id not do squat with no IR gun. not me. its super accurate too.
and dirt cheap and saves burned hands,
and finds clogged rad tubes saving useless $250 new rad.
one tool. use it. and win.


i this this dang I6 engine, that loves to trap air?
had 3,now, over 500k miles on them. 1988 to present.
and never overheated but once, pin hole in heater core hose
ran bypass and drove home.
i have a 08 wrangler 6sp, 3.8L v6 , nice rig. easy to fix too.

there are 2 parts. (3 really)
engine make too much heat, (limphome or timed wrong)
air in system.
cooling system.

the rad pressure test pass and the green/blue test passes

no water in engine oil
no oil or carbon seen in the engine coolant , all places look.

how hot, ??????
200f
260F
280F"?
numbers matter, in all ofscience. they talk to you.
at what exact temp did the fans, kick in,?
the FSM shows you this, and how to do that. how to make sure the
fans kick in happen, RIGHT. some are 2 staged with A/C.
not just kick. (when)

Aug 29, 2014 | 1997 Jeep Grand Cherokee

1 Answer

Why is our 2010 cobalt still overheating after changing the thermostat?it has the 2.2 engine.the temp reaches 210 +degrees.sitting idled and the cooling fan is not turning on.The cooling fan only runs


was the thermostat installed the correct way round . Fans should start spinning at around 75degres c. Check coolant temperature sensor ( not temp. gauge sender unit) for operation. Have a flow test done on the radiator to check for blocked cores.. Have a compression test done to check gasket and for cracks.

Aug 06, 2014 | 2010 Chevrolet Cobalt LS

1 Answer

2007 Chevy Silverado 2500 HD. I was driving and my digital dashboard reported engine hot and AC turned off. My temperature gauge read cool. What do I need to replace?


This sounds like a bad coolant temp sensor that give computer false reading, check the coolant temp sensor connector and if it is good with no bad wires to connector then replace coolant temp sensor , when the computer gets a signal from temp sensor that engine is hot it turns fans on high speed to cool radiator and displays a/c turned off , if this truck does not have electric cooling fans then they wont run just explaining what happens depending on engine and cooling set up. replace coolant temp sensor and check connector.

Dec 25, 2012 | 2007 Chevrolet Silverado 2500HD

1 Answer

My car temp gauge showed over heating at highway speed. Then upper rad hose blew. Pulled over and had car towed home. I have a Matco tools code reader. Computer doesn't show any codes. Why would that...


Using your tatco code reader, select current data (real-time data) and select engine coolant temp sensor (ECT). Run engine to operating temperature (A/C off). Monitor the temp reading - when the temp reaches approx 204 deg farenheit, the fans should kick on, after the temp drops to approx 198 deg farenheit, the fans should turn off. The fans are controled by the ECM (Engine Control Module). The ECM controls the cooling fan relays.

Sep 06, 2011 | 2006 Hyundai Sonata

1 Answer

My 2005 cobalts cooling fan only comes on when the a/c is one. i have a new fan, thermometer and my water pump is not leaking out water so i doubt its the water pump.


SOUND LIKE ENGINE COOLANT TEMPERATURE SENSOR OPEN OR BAD.HAVE THE ECT SENSOR CHECK WITH CODE SCANNER SEE IF ENGINE COOLANT TEMPERATURE SENSOR READING TEMPERATURE RIGHT.IF ENGINE COOLANT 200 DEGREES AND SCANNER SHOWS 80 TO 100 DEGREES YOUR ECT SENSOR BAD.

Jun 23, 2011 | 2005 Chevrolet Cobalt

2 Answers

Temp gauge is in normal, 200 degree, range when starting. Within a few minutes of driving goes up to 250, right below orange line. No leaks found, coolant level appears fine. Any ideas?


250 DEGREES ENGINE GETTING TOO HOT.SOUND LIKE CLUTCH FAN FREEWHEEL.IF CLUTCH FAN DONT LOCK IN OR HAVE RESISTANCE TURNING BY HAND WHEN ENGINE HOT.FAN CLUTCH IS BAD.IF FAN CLUTCH OKAY COOLANT LEVEL CORRECT.I WOULD CHANGE THERMOSTAT FLUSH OUT ENGINE AND RADIATOR.IF ENGINE TEMPERATURE STILL READS 250 DEGREES OVER FLOW JUG OR RESERVOIR NOT BOILING OVER THE COOLANT TEMPERATURE SENSOR FAULTY.

Nov 05, 2010 | 2003 Chevrolet Avalanche

3 Answers

I HAVE A 2007 CHEVY COBALT THE CHECK ENGINE LIGHT CAME ON I CHECKED THE COOLANT TEMP GAUGE THE DIGITAL GAUGE READING WAS ONLY SHOWING THREE BROKEN LINES. I CHECKED COOLANT LEVEL WHICH WAS FINE. ENGINE DID...


I had this problem with a 2007 Chevy Cobalt. I changed the coolant sensor and even though the check engine light went out I still had a reading of "---" on the coolant gauge. The problem is most likely one of three things: a low coolant level, a bad coolant sensor, or the thermostat needs to be replaced. The only other possible thing it could be is a bad BCM (Body Control Module) which in that case you would most likely be having other weird problems.

The Thermostat and the sensor are both very easy to get to and replace. Take off the engine cover by removing the oil cap and they are both to the rear of the engine on the driver's side. They are right next to each other.

Hope this helps!

Apr 14, 2010 | 2007 Chevrolet Cobalt Coupe

1 Answer

What is the high temperature on the radiator


Do you have a digital gauge that reads in numbers or a needle that goes from blue to red? Coolant will boil in a pressurized unit at 265 degrees F. plus, But you don't want to come anywhere near this temp. It should run at about 185- 200 F. Maybe more. So keep it cool. Hope this helps.

Apr 09, 2010 | 2007 Chevrolet Cobalt Coupe

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