Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor; Ground Event / Encounter Ground Equipment Issue
Air Traffic Control Provided Assistance; Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Returned To Gate; General Maintenance Action; General Flight Cancelled / Delayed
Human Factors
During offload a ground air cart blew a radiator hose into the intake and contaminated the packs. Maintenance tried clearing it and thought they had it clear. When ready to leave we started one in the chocks and cross bleed number 1. After both were started; we reconfigured the bleeds and packs and started to taxi. Once power was added we got an aft smoke then mid smoke then forward smoke warning. The odor was of the antifreeze that contaminated earlier.  Shut off all air and the warnings went away. Coordinated with ground and taxied in to the chocks and turned it back over to maintenance. They changed the pack filters and signed off the aircraft.The cause was [air cart] equipment malfunction.
Air carrier Captain reported an uneventful ground gate return due to a fume event caused by air cart radiator hose blowing into the packs.