The one in the trunk area is the intake. The exhaust vent for the diff is on the top of diff . I ordered one of these back in 2016 to confirm it was an exhaust only diff valve using some vacuum tests. On the top of rear diff somewhere.. think I located it in the day but can't remember now...
21-5C1 in this schematic is reportedly the breather tube for AT
https://www.zoomzoomnationparts.com/p/Mazda__CX-5/BREATHER-PIPE--BREATHER/105422307/FZ11215C1.html
Probably terminates in similar areas as the ‘13-‘16.5 models.
Former member hear with a ‘14 CX-5 IIRC… lost his diff from water intrusion.. TSB was unknown at that time years back.. he thought a water crossing but I think it was from a car wash
I change my front transfer and rear diff on 30k...
Anyone know where the diff vent terminates in the rear area of a 3 AWD? I wonder if there is a rare issue with a car wash that allows water in like the ‘13-‘16.5 CX-5 models?
Reference...
You can view rear diff engagement as well. Forscan being discussed here but you can also view with OBD Fusion/Link. Be sure to double the value shown to see correct percentage of engagement.
https://mazdas247.com/forum/t/2016-cx-5-awd-system-questions.123878840/post-6772708
It wasn’t hard to replace
https://mazdas247.com/forum/t/cx-5-rear-diff-and-transfer-case-fluid-change-tools-parts-and-links.123850370/page-8#post-6745047
Ordered some near 100k mile maintenance parts.. not many with free shipping still and local dealers don't seem willing to price match. Nothing wrong with current tensioner but just a matter of time...and making job easy on myself with a little less RTV to scrape on the AT pan.
Ordered...
Reminder to ensure your ‘13-‘16.5 has this retrofit vent for the rear differential on AWD models to avoid potential water intrusion into rear differential.
#RearDiffWaterIntrusion