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Chevrolet Repair/Digital Heater/AC Control

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Question
I have a 1990 Chevy Silverado, 350 with auto. Trans. The Digital Heater Control Quit working, will not illuminate at all. I replaced all blower relays with new ones and replaced the digital control head with a known, good control head and it wouldnt work or light up either. I cleaned the terminals on the control head and replaced the heater/AC fuse with a new one.Any help would be greatly appreciated.

Answer
HI WILLIAM, HAVE YOU CHECKED FOR POWER ON THE HRNESS PLUG GOING INTO THE CONTROL HEAD THAT YOU HAVE REPLACED ???? I THINK YOU WILL FIND A ORANGE WIRE THAT SHOULD POWER UP THIS UNIT..IAM NOT AT WORK SO I DO NOT HAVE A WIRING CHART TO CK THIS..BUT CK FOR POWER ON ANY WIRES BACK THERE..SHOULD HAVE 12 VOLTS WITH KEY ON..WE HAVE HAD SOME PROBLEMS WITH THE MAIN WIRING HARNESS THAT FEEDS THIS CONTROL HEAD LOOSEN UP AND FALLS OUT OF THE PLUG UNDER THE DASH..CK THIS ABOVE INFO OUT AND GET BACK TO ME WITH WHAT YOU FIND TO THIS POINT. ON FRIDAY IF YOU GET BACK TO ME EARLY IN THE DAY I WILL CK THIS OUT ON MY WIRING DIAGRAMS AND GET BACK TO YOU IF YOU STILL HAVE NO POWER TO THE CONTROL HEAD..BY THE WAY,, THESE DO GO BAD..BUT YOU SAID YOU ARE SURE THE ONE YOU REPLACED IT WITH IS GOOD,,, CORRECT ??? LET ME KNOW,,,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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