Does anyone else hear a rattle behind the dash / rear of engine on cold start up for the first mile or so

 

On mine it was the A/C lines hitting part of the HVAC housing. I fixed it by grabbing the lines at the firewall, and moving them enough so they came to rest is a slightly different position. It's been quiet since.

I don't know if your 2012 is the same at the firewall, though.

 

same here, it may be that little plastic valve on the washer fluid hose under the hood vibrating on the plastic engine cover. it goes away so fast i cant get a chance to try much each time.

i wrapped that valve in foam yesterday. i barely heard it today.

next time its cold outside as i find i need it in the 30's ill try removing that plastic cover before i take off. that will confirm something is vibrating on it when it shrinks from the cold but stops vibrating once the hot plastic forms a tighter fit.


many many 2012 owners have the noise and most found its the plastic valve on the plastic engine cover


https://www.jk-forum.com/forums/show...t=engine+cover

 

same noise here - i tried the valve on washer line - but alas did not help -

 

Check my thread on the weather stripping near the windshield body area and hood meet mine was completely off but looked secure and caused all my noise

Quiet free jeep now

I did a video on it

Check out this video on YouTube:

http://www.youtube.com/watch?v=GObuE...e_gdata_player

 

so i removed the plastic engine cover, wrapped the plastic valve on the hood in foam and checked the weather strip . still got the buzzing rattle when cold.

ill check the heater pipes next and then im out of ideas.

 

I had the same annoying vibrating sound that you described. Tried switching around the sprayer tubing.....nothing. Then, while I was installing some windshield lights, I noticed that the weatherstripping that you mentioned was off. I didn't think anything about it and just put it back in place. After a day or two, I noticed that the rattle was gone!! I thought that it just magically disappeared. Thanks for helping me up 2 and 2 together.

 

Awesome I'm glad the video is helping others and saving to go to the stealership

 

i have rattle but weather stripping is good and tight -

i did however, tap on the hood liner and found it rattles bad - actually a very familiar rattle -

i taped it down - will see how it is when i drive tomorrow

fingers crossed

 

hmmmm hood liner. ill check that too...