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Chevrolet Repair/Overheating

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Question
91 s10 with 4.3 engine temp gauge goes over 260 but no hoses blow or any other signs of overheating. Replaced thermostat and still have same issue water pump doesn't  have any leaks and oil looks fine. What could be causing this

Answer
GOOD DAY LEE, WELL FIRST THINGS FIRST,IF THIS ENG IS REALLY RUNNING AT 260 THIS WILL CAUSE DETRIMENTAL HARM TO THE HEAD GASKETS AND HEADS AND POSSIBLE BLOCK....SO WITH THAT BEING SAID WHEN THE GAUGE IS SHOWING THIS CAN YOU SQUEEZE THE UPPER RADIATOR HOSE OR IS IT HARD AS A ROCK..IF THE UPPER HOSE IS WARM BUT NOT REAL HOT AND HARD I WOULD THINK THAT THIS ENGINE IS NOT REALLY RUNNING THIS HOT..WE HAVE TO BE SURE BEFORE WE CAN DO ANY OTHER DIAGNOSTICS.  SO THE ONLY THING LEFT IS A BAD TEMPERATURE SENDING UNIT OR THE GAUGE ON THE DASH IS LOOSING ITS MIND..YOU COULD TAKE IT TO A SHOP AND HAVE THEM PUT A TEMPERATURE GAUGE IN THE RADIATOR TO BE SURE IT IS NOT THAT HOT. THIS IS A FAST WAY TO TELL OR YOU COULD HAVE THE TRUCK SCANNED WITH A SCAN TOOL TO CK FOR A COOLANT TEMP SENSOR READING,THIS WILL BE DIFFERENT THEN THE TEMP GAUGE THAT THE GAUGE GETS ITS REFERENCE FROM..IF THE SCAN TOOL SHOWS THAT IS REALLY RUNNING THAT HOT THEN YOU HAVE A PROBLEM...I WOULD THINK THAT IF IT REALLY WERE RUNNING THIS HOT YOU WOULD HEAR THE INSIDE OF THE RADIATOR MAKING ALL KINDS OF BANGING NOISES...IF WHEN THIS GAUGE IS SHOWING THIS HIGH TEMP AND YOU CAN [SAFELY] REMOVE THE RADIATOR CAP AND THE COOLANT IS NOT BOILING OVER WHEN THE ENGINE IS RUNNING I DON'[T THINK IT IS THAT HOT..LET ME KNOW WHAT YOU FIND AND IF YOU NEED MORE HELP GET BACK TO ME.
GOOD LUCK TO YOU,,,,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.

Organizations
nys state auto repair industry and ase group.

Publications
N/A

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

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

Past/Present Clients
MANY CUSTOMERS IN OUR BUSY SHOP.

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