B737-800
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 186; Flight Crew Type 186
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
We taxied into ZZZ; Gate X; with both engines running. After shut down the F/O (First Officer) started to operate the AC (Air Conditioning) packs off the APU bleed. Immediately after the switch we smelled fumes and a slight haze/smoke was noticed the AC; we believed the source to be the packs so we shut down both packs and APU bleed and the fumes and haze started to dissipate. The jet way was already pulling up so after discussing with my F/A's (Flight Attendants) and F/O we decided a normal deplaning would be best.I made a PA and informed the passengers there was not an [urgent situation]; and to deplane normally. After the aircraft was secure and checklist completed I asked Ramp to do a walk around then come to flight deck to inform me on anything suspicious that was discovered. I followed up with a walk around to look at packs for any noticeable damage or smell. The right pack had a hint of the suspicious smell left. We did not [request priority handling] because we believe we had identified and isolated the issue and at no time were flames observed just smell and slight smoke.
B737-800 Captain reported a fumes event during gate arrival. The crew secured both packs and APU bleeds and performed normal deplaning.