NEWS | Aug. 5, 2021

M997A3 HMMWV Ambulance: New and Improved HVAC Kit on the Way

Soldiers, excited about receiving the M997A3 HMMWV ambulance with the new and improved heating, ventilation and air conditioning (HVAC) system kit?

Good news! Units will start receiving vehicles with the upgraded kits soon, if they haven’t already.

Rock Island Arsenal is installing the HVAC system kit on new vehicles, while already-fielded vehicles are going through a retrofit program starting in FY22 at Red River Army Depot.

Verified maintenance and troubleshooting work packages, schematics and the Repair Parts and Special Tools List (RPSTL) won’t be ready until 2022. Meanwhile, TACOM has drafted interim troubleshooting and maintenance procedures, as well as schematics and RPSTL information, to help operators and maintainers.

Wondering whether your M997A3 ambulance already has the upgraded HVAC kit? The upgraded system has toggle switches, while the old system has slide levers.

For more info, check out TACOM Maintenance Action Message 21-038 at:

You’ll need your CAC to access the message.