+ Reply to Thread
Results 1 to 4 of 4
  1. #1

    Default Hissing sound after driving

    Hi all, I went to test drive a smart for two 451 MHD 2010. After test driving, I noticed a hissing sound and water dripping from the bottom of the car. The hissing sounded like air being released from a tyre. My suspicion is that it is related to the air conditioning and is completely normal. But, I have never come across this in any other car before.

    Could someone please advise?
    Many thanks.

  2. #2
    Join Date
    Jul 2005
    Location
    over here
    Posts
    13,599

    Default Re: Hissing sound after driving

    It’s related to the air on and is completely normal

    The hissing is residual pressure at the expansion valve/pinch point.

    The water is condensate (ambient water vapour) off the cooling coils/evaporator.

    Every working aircon equipped car does it.
    fq101.co.uk

  3. #3

    Default Re: Hissing sound after driving

    That makes sense. Thank you.

  4. #4
    Join Date
    Jun 2005
    Location
    Aberdeenshire
    Posts
    2,010

    Default Re: Hissing sound after driving

    Could also be Hissing Sid.
    https://youtu.be/IRNdqtpZHHQ

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts