VEHICLE & INCIDENT: 2019 Jeep Wrangler JL 2.0L Turbo. While climbing an extended grade on Hwy 87, vehicle experienced a sudden sluggish throttle anomaly and rapid coolant temperature spike from ~215F to 255F under load. Vehicle was pulled off and shut down within ~20 seconds. SUSPECTED FAILURE MODE & UNDERHOOD FIRE: Upon opening the hood, pressurized coolant had sprayed across the engine bay from a split in the smaller rubber hose branch of the engine coolant outlet assembly (Mopar PN 68280797AC). The hose split longitudinally ~13mm with the center ~32mm from the hose end. The vehicle is equipped with a Baja Designs T-Fitting to replace 68280784A The hot, pressurized coolant sprayed directly onto the exposed, center section of the turbocharger between the compressor and turbine sections and on the turbine section itself. The coolant is suspected to have flash-ignited on contact with the turbo, creating an active under hood fire that began spreading to the hood insulation liner. The fire was successfully doused roadside with water, preventing a total vehicle burn-down. No other fuel sources were noted and the lines to the turbocharger were intact and did not show evidence of a leak. SAFETY CONCERN / HAZARD FOR NHTSA: 1. FIRE HAZARD: Pressurized factory coolant hoses and plastic junctions on the 2.0T GMET4 are routed in close proximity to the unshielded turbine housing. A hose rupture under normal grade-climbing thermal loads results in high-pressure atomized coolant hitting