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Chevrolet Repair/engine hot. a/c turned off message

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Question
I have a 2009 GMC Sierra with a 4.3L engine. Sometimes I get a message displayed "engine hot,a/c turned off" on the display panel. this seems to happen when engine doesn't reach its normal operating temp of @210 degrees. I can tell when it is going to happen just a few miles down the road. the message will appear and the temp hand will drop to the bottom.
I can disconnect the battery for a few and clear it out, when cleared the temp reads 210@ and all is well for a bit then it will eventually come back again. Any ideas as to what would caise this? maybe a thermostat opening to early?

Answer
GOOD MORNG GREG,IF THE T-STAT WAS OPENING EARLY THE ENG WOULD TAKE LONGER TO HEAT UP..THE T-STAT COULD BE STICKING IN THE CLOSED POSITION OR PARTIALLY CLOSED POSITION. WHEN YOU REMOVE A BATTERY CABLE THIS JUST CLEARS THE PCM AND BCM TO WIPE OUT THE MESSAGE. THE PROBLEM IS STILL THERE UNTILL IT GETS WARM AGAIN AND SETS ITSELF..ALSO IF THE T-STAT WAS OPENING TO SOON THIS WOULD SET A CODE AS WELL. [TEMP NOT REACHING SPEC] 210 DEGREES IS GETTING WARMER THEN IT SHOULD TODAYS ENGINE RUN @ 195 TO 200..I AM JUST SURPRISED YOU ARE GETTING A MESSAGE LIKE THIS AT ONLY 210 DEGREES..HOWEVER YOUR GAUGE MAYBE A LITTLE OFF AS WELL.. A SCAN TOOL MAY REVEAL A DIFFERENT STORY..I GUESS IF THIS WERE MINE I WOULD MAKE SURE THE COOLANT LEVEL IS FULL IF NOT FIND OUT IF THERE IS A LEAK AND REPAIR IT AND FOR GOOD MEASURE REPLACE THE T-STAT JUST TO RULE THIS OUT..THEN SEE HOW THIS WORKS OUT..HOPE THIS HELPS YOU AND GOOD LUCK,,,TOM..

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TOM SHEETS

Expertise

PLEASE READ ALL OF THIS BEFORE ASKING ANY QUESTIONS. IF THIS CHEVY SECTION IS MAXED OUT.YOU CAN REACH ME IN THE OLDS/BUICK SECTION. Will answer questions from 6:00am to 10:00pm all days [EST][[[ NO DIESEL OR PAINT QUESTIONS]]] will answer all 1965 to present QUESTIONS ON ALL GM'S on mechanics of these cars. Keep in mind i am not there in person i am going on what you are telling me !! PLEASE IF ASKING A QUESTION GIVE ME AS MUCH INFO AS POSSIBLE. THE MORE THE BETTER. SUCH AS YEAR,MAKE,MODEL,ENGINE SIZE. THIS WILL HELP ME HELP YOU. I will not be able to answer all questions because of some situations that i would really need to be there and see things for myself,such as electrical issues. In many cases i would need wiring diagrams. I can also give you an estimate on what the cost would be at our repair shop as an idea to help you. Keep in mind that my answer is ONLY MY ADVICE,ck with your mechanic as well.. >> THANK YOU, TOM..

Experience

I have been a ASE certified master mechanic for over 30 years and certified IN ALL 8 CATEGORIES,[engine repair,engine performance,auto trans,manual trans,clutches,steering and suspension,brakes,electrical systems,heating and air/cond. I am also a state CERTIFIED inspector for over 30 years. I do computer work [pcm]fault codes,pcm flashing,state inspection monitor readiness,repairs on exhaust,fuel service,[injection and carburetor,] charging system problems, running issues,alignments,frame problems,tire balance,struts and of course standard and anti-lock brakes.

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nys state auto repair industry and ase group.

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Education/Credentials
high school,4 years of tech school,and many many hours of auto training with many gm classes and aftermarket training classes..

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ASE MASTER TECH CERTIFIED IN ALL 8 CATEGORIES.NYS INSP LICENSE AND A/C CERTIFIED

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