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Pontiac Repair/GMC Yucon xl ac Tensioner bobbles
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Question
QUESTION: My Question is why does My lower Belt Tensioner Bobble This goes Arond The drive shaft pulley And AC Pully only.
ANSWER: Hi David:
More then likely the spring in the tensioner os weak and making it move up and down. Or the belt is worn out "streached" and it's past what the normal amount of slack the tensione can take up or lastly the a/c compressor is seizing up or the line pressures are to high in the a/c system. Does it do it when the a/c is on only? or all the time?
---------- FOLLOW-UP ----------
QUESTION: It bobbles only when the AC is on.
It can still be any of the 3 issues I mentioned before. Depending on what year this is there may or may not be a mark on the tensioner arm and on the tensioner body and they should line up meaning the belt is not streached and the tensione has the proper amount of pressure on the belt but Not all of them have those "witness" marks on them.
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Todd Puccio
Expertise
General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.
Experience
Experience in the area:I have been employed by the same Gm dealer for 18 years and and a ASE master technician. I work at a Pontiac and GMC truck store. Served a a lead technician when dealership was on a team system.
I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership.
Organizations: ASE master technician
Education/Credentials
Education/Credentials:High school diploma,2 year vocational school degree
2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician
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