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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
(1264 views)
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2000 Suburban a/c tensioner assembly knocking/banging
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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.
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 30, 2018, 8:30 AM
Post #2 of 7
(1257 views)
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Re: 2000 Suburban a/c tensioner assembly knocking/banging
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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
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Hammer Time
Ultimate Carjunky
/ Moderator
Aug 30, 2018, 10:44 AM
Post #3 of 7
(1252 views)
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Re: 2000 Suburban a/c tensioner assembly knocking/banging
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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. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Aug 30, 2018, 12:12 PM
Post #4 of 7
(1247 views)
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Re: 2000 Suburban a/c tensioner assembly knocking/banging
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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
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Discretesignals
Ultimate Carjunky
/ Moderator
Aug 30, 2018, 12:58 PM
Post #5 of 7
(1240 views)
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Re: 2000 Suburban a/c tensioner assembly knocking/banging
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Maybe a problem with the ac compressor is causing the belt to bounce around. Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 1, 2018, 3:52 PM
Post #7 of 7
(1199 views)
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Re: 2000 Suburban a/c tensioner assembly knocking/banging
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It still shouldn't allow the tensioner to bottom out with a properly sized belt. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 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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