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Old 04-30-2019, 09:02 PM
Join Date: Aug 2017
Location: North America
Posts: 15
esevx5 is on a distinguished road
Want to change the Serp belt - is the AC belt replacement necessary?

Considering its rarely used (never in winter)

Worst case if it ever does break, it won't damage anything and the car will still run
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Old 04-30-2019, 09:32 PM
Join Date: Apr 2009
Location: Columbus, Ohio
Posts: 513
Purplefade is on a distinguished road
Iím of the opinion that they both have the same mileage on them and the same real wear and tear so if replacing one, I personally would replace both.

I know itís a bit of a pain, but with the belt being driven by the crank pulley that belt is turning constantly even with the ac off - granted with very little/no load, but still subject to all the same heat cycles, etc under the hood.

My thought, change them both

No REAL need to, to your point, car will still run, unless that belt shreds and takes the serpentine belt out with it... just sayin...
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Old 05-01-2019, 08:10 AM
Join Date: Jan 2018
Location: Charleston, SC
Posts: 134
Baby Unicorn Taco is on a distinguished road
Change them both. Itís an $8 belt. Also Dremel the top of the bolt so you can use a flathead screwdriver to loosen the tensioner.

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Old 05-01-2019, 05:32 PM
Join Date: May 2009
Location: USA
Posts: 817
FunfDreisig is on a distinguished road
This thread https://xoutpost.com/bmw-sav-forums/...ine-noise.html has info on replacing both the serpentine and A/C belts on a 2009 35d.

Funf Dreisig
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Old 05-01-2019, 09:49 PM
Join Date: Aug 2016
Location: Brooklyn, NYC, NY
Posts: 339
robnitro is on a distinguished road
My ac belt went a while back and damaged my serp belt by dislodging it with its bits. Do em both. Half the hassle of doing serp is removing and putting ac belt... no extra time needed
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Old 05-03-2019, 08:17 AM
Join Date: Apr 2014
Location: NYC
Posts: 41
Nyc Dito is on a distinguished road
Just a quick tip or suggestion if this is for a 35d. Make sure the AC belt is a "stretch" belt if you do not get it OE. 4PK843 is the correct aftermarket number (even referenced in the ETK) but some companies do not supersede it to the correct "stretch" style belt. I learned this the hard way lol
E70 LCI 35d
E90 LCI 328i xDrive

E39 528i Sport/5sp
E28 535is
E84 X1 35ix M packaged
E38 740i Sport
E39 E39 M5
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