u/AppleSam23

Hi, hope anyone here recognizes the issue with my 2015 Hyundai i20 GB and knows how to resolve. Observations to note:

Rumbling / bubbling sound as in video (sound boosted a bit). Audible both when driving and idling.
Present when climate control or A/C switched on or off.
Seems to occur more often in hot weather
Unpredictable when the sound appears. It can be gone for a while and then suddenly come back. You can hear it stop around video end.
Present since I bought the car second hand in Feb 2025 (didn't catch it then, low occurrence because of cold weather)
A/C has been serviced and it did not resolve the issue.
Brought the car into the shop for this specific issue, but sound was not present at that moment. They did some checks and nothing seemed off.

Please let me know if you have any suspicions!

Hi, hope anyone here recognizes the issue with my 2015 Hyundai i20 GB and knows how to resolve. Observations to note:

Rumbling / bubbling sound as in video (sound boosted a bit). Audible both when driving and idling.
Present when climate control or A/C switched on or off.
Seems to occur more often in hot weather
Unpredictable when the sound appears. It can be gone for a while and then suddenly come back. You can hear it stop around video end.
Present since I bought the car second hand in Feb 2025 (didn't catch it then, low occurrence because of cold weather)
A/C has been serviced and it did not resolve the issue.
Brought the car into the shop for this specific issue, but sound was not present at that moment. They did some checks and nothing seemed off.

Please let me know if you have any suspicions!