vibrations/rattle around 3-4k

[SharpAndy]

I am a Honda tech, and my project this week has been a 2023 integra with the rattle at 3500-4K. This vehicle is a manual transmission, and it only happens at that RPM range. I just found it yesterday. We found it to be the heater core rattle against the heater box. Also found that the heater box’s mount was broken. The whole dash is out, and we are waiting on parts now. You can see if this is your issue by revving the car to the point it makes the rattle and have someone wiggle the coolant lines that come out at the heater core.

I noticed that my Integra JUST started doing that about two days ago. So I now have three completely different squeaks and/or rattles...this new rattle sounds like it's coming from under the dash and occurs between 3000-4500 rpm. There's still the squeak from the bezel around the HUD, and the hatch rattles. So it's definitely not a quiet ride at any given time. I guess I just couldn't hear the newest one until I took the roof bars off, because they will drown out even your most inner thoughts.

 

[bpebler]

number 9 is the heater core pipe retainer. they call it a stay. The top tab was broken off allowing the pipes to touch together.

Is this also to say that it may likely happen again with the same kind of fix & parts until Acura/Honda find a better solution towards a forever fix?

 

[starter_hart79]

Is this also to say that it may likely happen again with the same kind of fix & parts until Acura/Honda find a better solution towards a forever fix?

In my case I don’t think it was a part issue. I think it was an assembly issue.

 

[zachristo]

I’ve found that turning the heater on full for 10 seconds or so then returning to the desired temp alleviates the rattle usually for the length of the drive. That will hold me over to the next service where I can bring it up with the dealership. Maybe that trick can help others being driven crazy by this.

 

[starter_hart79]

I’ve found that turning the heater on full for 10 seconds or so then returning to the desired temp alleviates the rattle usually for the length of the drive. That will hold me over to the next service where I can bring it up with the dealership. Maybe that trick can help others being driven crazy by this.

That to me sounds like an issue with the blend door or the blend door actuator.

 

[AceRaiden]

Hey guys, I have the same issue on my 22 Si. Goes away when I do the full heat trick. Did you ever find a solution

 

[starter_hart79]

Hey guys, I have the same issue on my 22 Si. Goes away when I do the full heat trick. Did you ever find a solution

Do the same thing, but this time start with the heat on the lowest setting and keep the blower on the lowest setting too, and rev it up. Then turn heat to highest setting with blower still at lowest setting. I think your issue is a blend door rattling in a certain location. I don’t think it has anything to do with the actual temperature or the blower action. Could be wrong though.

 

[AceRaiden]

Do the same thing, but this time start with the heat on the lowest setting and keep the blower on the lowest setting too, and rev it up. Then turn heat to highest setting with blower still at lowest setting. I think your issue is a blend door rattling in a certain location. I don’t think it has anything to do with the actual temperature or the blower action. Could be wrong though.

Good idea! Will give it a try and report back.

 

[Palut]

You can get to the blend door actuator mechanisms with a little work. Removing the lower driver side trim and knee airbag gets you in on that side, while removing the glove box and lower dash trim gets you there on the passenger side.

My car had a lot of play in those mechanisms when I explored down there, but I didn't actually make any adjustments to them and my car is quiet. I may have been lucky.

 

[starter_hart79]

You can get to the blend door actuator mechanisms with a little work. Removing the lower driver side trim and knee airbag gets you in on that side, while removing the glove box and lower dash trim gets you there on the passenger side.

My car had a lot of play in those mechanisms when I explored down there, but I didn't actually make any adjustments to them and my car is quiet. I may have been lucky.

For a 22 i would just take it back to the dealer. But it helps the dealer when you go in with all the info possible.

 

[CatBus]

I know this is an old thread, but looks like my car had some similar heater core issue. There is still some sort of rattle, but it doesn’t seem as persistent. I’m also just trying to increase my tolerance for a little rattle.

The notes from the dealership mentioned a heater core issue.

 

[CatBus]

Just wanted to update everyone. So my rattle seemed to come back, or it was a different rattle. I went hunting in the infotainment area but found nothing.

I bumped my head on the area around the rearview mirror and heard a rattle!!! Turns out the sound was coming from the area around the rearview mirror assembly! I pushed everything together and then drove about 10 miles. The rattle is gone!

All in all, I do not know if I had two rattles or just this one. But if you are searching for a rattle try tapping around the rearview mirror assembly to see if there is a rattle there. Hopefully this post helps someone in the future.