<span dir="auto" style="vertical-align: inherit;"><span dir="auto" style="vertical-align: inherit;">Trying not to be paranoid about every little sound my car makes but this one's specific enough that I figured it's worth asking about. whenever I turn my XF off after driving with the AC on, there's this faint hissing sound that lasts maybe 2-3 seconds right after I shut the engine off, almost like something depressurizing quickly. doesn't happen if I turn the AC off before actually stopping the car, only happens if the AC was still running when I shut the engine down completely. The car itself drives and cools totally fine otherwise, no weird symptoms during actual use, just this one specific sound at shutdown that I never really noticed until a few weeks ago. asked a coworker who's owned a couple different Jaguars over the years and he said that could honestly just be normal pressure equalizing in the system once the compressor stops running abruptly, but he also said he's never personally paid close enough attention to notice if his own cars did the same thing, so he wasn't fully confident either way. spent a bit of time reading about it last night and found This Sharjah workshop for Jaguar AC repair that mentioned brief hissing right at shutdown can sometimes be totally normal refrigerant settling, but said it's worth actually getting checked if it starts lasting longer than just those first couple seconds or if it starts happening even when the AC wasn't running beforehand, which thankfully isn't the case for me right now, it really is just that brief window right at shutdown specifically when the AC was already on. still a little unsure if I'm being overly cautious here or if this is actually something worth getting looked at sooner rather than later, part of me wants to just monitor it for a couple more weeks and see if it changes at all before spending money on a diagnostic for something that might genuinely just be normal operation. has anyone else with a Jaguar or honestly any car noticed this kind of brief hiss specifically at shutdown, curious if this is actually a common thing that just goes unnoticed by most people or if I've got something starting to go wrong that just hasn't fully shown itself yet in terms of actual performance issues.</span></span>