This is a Buick Lucerne Automatic Climate AC Heater Temperature ControIt is compatible with vehicles that have the Vehicle VIN 1G4HA5EM3BU114445. The Other Part Number is HAC01836 and the Interchange Part Number is 01836. and it has a Manufacturer Warranty of 90 Day. This control unit is ideal for those looking to upgrade their car's HVAC Controls & Control Units and is a great fit for car enthusiasts.