Same sound on my CU2 when starting the engine. Happen only in the morning when car stayed overnight or if parked for long time. But same sound....
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i only just skimmed through the thread, but you will need to send it to get fixed, something about a valve/AC. :D
Had this WHOOPing problem a long time ago with my CL9 Black Luxury Euro in 2003. There were very very few replies back then but aaronng's diagnosis is spot on - the TX valve is what's making the noise and it needs to be replaced.
Back then I had warranty to cover this but I sold the car before it ever got replaced - entire dash needs to be removed and it is an extensive job.
The WHOOPing noise got progressively bad over time that it could happen anytime - be it during winter/summer and the A/C is on.
Thankfully nothing on my current CU2 (touch wood ...) :thumbsup:
I concur with primetimex, sounds like the Tx valve which is expensive and should be fixed under warranty.Honda will claim it's a normal operating noise which is rubbish and not befitting of a car which is supposed to be best in class. I have owned old mazda 626's and a Mitsubishi Mirage which had a/c systems that were reliable and QUIET.....go figure.
I eliminated my noise by selling the car and getting a Lexus !
Good luck everyone !!