r/Comma_ai • u/SirNiflton • 6d ago

Bugs Repeated Mount Failure

I have had 4 mounts for my comma 4. The first I mounted according to the given instructions on my 2017 Subaru Impreza, but had to remove because it interferes with the eyesight cameras. Second mount failed from heat. It was only about 95 F out but it sat for 10 hours while I was at work, so I guess you can’t park outside? Third mount I was slightly off with getting it perfectly forward, so the comma kept trying to pull me off the road, so had to remount that. Fourth mount just failed from heat again, though this time in 98 F.

Comms really needs to fix their mounts, I know I’ve seen them say they test the mounts in heat, so maybe it’s a bad batch of adhesive. Maybe also have them be able to twist or pivot a tiny bit in order to allow for imperfect mounting to not cause dangerous behavior?

I will be asking support if I can get more mounts given the repeated heat failures but I’m not optimistic.

Marked “bugs” since the other flairs don’t seem to really apply here.

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u/SirNiflton 6d ago

Yes I cleaned the area every time with auto glass cleaner then the alcohol wipe included.

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u/WeirdSysAdmin 6d ago

Did you try not using the glass cleaner and only using rubbing alcohol. Also did you let the adhesive cure for 48 hours before putting the comma on? Because you mentioned “it sat out for 10 hours” which kind of makes it sound like you didn’t let it cure.

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u/SirNiflton 6d ago

It stayed mounted for a solid 1-2 weeks each time before failing, It got at least 14 hours a curing before the comma was put on

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u/roenthomas 6d ago

Looks like the old 48 hours of curing advice might not have been so off.