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Chevrolet Repair/over heating

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Question
2000 chevrolet venture with a v 6 motor about 177654 miles on it it heats up put a new radiator on it about 6 months ago cause it was leaking and befor it started runging hot the temp gauge would move up and down it would go half way then go on up.the heater core had a small leak so thry put a half of bottle of bars stop leak in it.could that have stoped it upcause the day they put it in it ran for about 3 days befor it started to run hot.or could it be the thermostat causeing it to run hot.oh yes the heater will put out good heat for a few mins and then it will get cold then in a few mins it will get hot again....i am trying to just help this older lady get it fixed cause she dont have any money to take it to the shop   thank you and god bless

Answer
GOOD MORNING CHUCK,THIS COULD BE A COUPLE THINGS. I WOULD LIKE TO SEE IF YOU COULD GET THIS PRESSURE TESTED TO MAKE SURE THERE ARE [[NO EXTERNAL LEAKS.]] IF THERE ARE, FIX THIS FIRST.  MAKE  SURE THE COOLING FANS COME ON WHEN SITTING IDLE AFTER IT WARMS UP. THIS IS VERY IMPORTANT. IF NO LEAKS ARE FOUND AND THE FANS COME ON,, THE NEXT STEP WOULD BE TO PUT A NEW THERMOSTAT IN AND HOPE FOR THE BEST. WE HAVE HAD SOME ISSUES WITH BAD HEADGASKETS ON HESE ENGINES..BUT LETS NOT JUMP TO CONCLUSIONS JUST YET..START OUT WITH BABIE STEPS AND GO ON FROM THERE..IF ALL OF THE ABOVE IS ALL GOOD,THEN YOU WILL NEED TO ASSUME THAT THIS ENGINE HAS BAD HEADGASKETS. THERE ARE TEST FOR THIS BEFORE YOU RIP THE UPPER HALF OF THE ENG APART..LET ME KNOW JOW YOU MAKE OUT TO THE FIRST 3 STEPS AND GET BACK TO ME IF YOU WANT TO KNOW HOW TO TEST FOR A BAD HEADGASKET...GOOD LUCK TO YOU AND I HOPE THIS HELPS YOU..TOM...

Chevrolet Repair

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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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