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2000 Suburban a/c tensioner assembly knocking/banging


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Abel Montes de Oca
New User

Aug 30, 2018, 6:47 AM

Post #1 of 7 (195 views)
2000 Suburban a/c tensioner assembly knocking/banging Sign In

My a/c tensioner assembly is knocking/banging as the belt moves across the pulley whilst the a/c is on and the engine revs between 2000-3000 rpms. At 3100 rpms the banging/knocking goes away. The banging/knocking occurs at the tensioner stoppers (not sure what the correct nomenclature is) as the pulley bounces more than usual when the belt moves across it. When the a/c is off the knocking/banging ceases but the tensioner does bounce a bit when the belt moves across it but not enough to knock/bang against the stoppers. I have replaced the tensioner twice, one with an OEM and the other with a cheaper aftermarket. The latter performed better than the OEM tensioner assembly. I have also replaced the belt. Note: belt was replaced along with tensioner assembly because the a/c belt was broken. I assumed is was a tensioner assembly issue. Please help.


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 30, 2018, 8:30 AM

Post #2 of 7 (188 views)
Re: 2000 Suburban a/c tensioner assembly knocking/banging Sign In

If it's bad and definitely that it has to go again? IDK - Ask if there's a higher quality one and just do the belt anyway while there if the little belt one separate from the main one it's not a two minute deal,


T



Hammer Time
Ultimate Carjunky / Moderator
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Aug 30, 2018, 10:44 AM

Post #3 of 7 (183 views)
Re: 2000 Suburban a/c tensioner assembly knocking/banging Sign In

If the tensioner is bouncing off the stop, then clearly the belt is too long, whether it be because it's stretched out or just the wrong one.



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Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 30, 2018, 12:12 PM

Post #4 of 7 (178 views)
Re: 2000 Suburban a/c tensioner assembly knocking/banging Sign In

Chose belt like Dayco, Gates or NAPA's good stuff. FYI they sell "Quiet" belts if this is the small one I wouldn't use the "Quiet" belt they are if a problem but this one too small IMO stretching more (they do) isn't on your side,


T



Discretesignals
Ultimate Carjunky / Moderator
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Aug 30, 2018, 12:58 PM

Post #5 of 7 (171 views)
Re: 2000 Suburban a/c tensioner assembly knocking/banging Sign In

Maybe a problem with the ac compressor is causing the belt to bounce around.





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Sidom
Veteran / Moderator
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Sep 1, 2018, 11:11 AM

Post #6 of 7 (142 views)
Re: 2000 Suburban a/c tensioner assembly knocking/banging Sign In


In Reply To
Maybe a problem with the ac compressor is causing the belt to bounce around.


I seem to remember that year span as having a problem with the original comp with an oil slugging problem? The usual problem was breaking the a/c belt.

I thing there might of been a TSB on the problem.


(This post was edited by Sidom on Sep 1, 2018, 11:12 AM)


Hammer Time
Ultimate Carjunky / Moderator
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Sep 1, 2018, 3:52 PM

Post #7 of 7 (130 views)
Re: 2000 Suburban a/c tensioner assembly knocking/banging Sign In

It still shouldn't allow the tensioner to bottom out with a properly sized belt.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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