US/LHD BMW E46 Under-Dash Heater, Evaporator and Blower-Case Assembly Identification

No formal 64116902870-to-64118372792 supersession is asserted. The first is retained only as a seller-observed physical label on loaded used modules; 64118372792 is the checked empty service housing and is marked discontinued by ECS Tuning and BMWPartsDeal even though another merchant rendered an Add-to-Cart path. Shared use of the empty housing across checked E46 catalogs does not prove that IHKA and IHKR controls, harnesses, actuators, sensors, blower/final-stage equipment, heater core, evaporator, tubes, drains or loaded contents interchange. No E46-to-E83, RWD-to-xi, body, M3/non-M, LHD/RHD or heater-only/A-C supersession is claimed.

Begin with recipient and donor VINs/build dates, body, engine, RWD/xi, left-hand drive and the installed climate-control type: IHKA automatic versus IHKR semi-automatic. Photograph the housing and every module label before purchase. Compare firewall heater/evaporator tube positions, refrigerant fittings, condensation drain, cowl and dash mounts, duct outlets, blower/final-stage interface, wiring connectors, sensors, flap count and travel, actuators or Bowden-cable equipment, seals and fasteners. A shared empty-shell number does not prove a loaded case is plug-compatible. Require a written inventory of empty shell versus heater core, evaporator, expansion valve, blower, final stage, doors/flaps, gearboxes/actuators, sensors, harnesses, controller, ducts, tubes, drain, seals and hardware. Reject cracked/warped/melted cases, broken tabs or ducts, seized or stripped doors/gears, cut harnesses or tubes, uncapped refrigerant ports, coolant/oil/stop-leak residue, corrosion, mold, pests, odor, water/flood/fire exposure, missing drains/seals or unknown repair. Refrigerant must be recovered with approved equipment by qualified personnel before opening the system; coolant, dash, battery and restraint-system precautions require current BMW service information and qualified installation. No refrigerant venting, restraint bypass, control bypass or unsupported coding conversion is provided.

A new empty service housing may be compared by exact 64118372792 identity, but the checked US sellers mark it discontinued and another merchant's order path requires fulfillment confirmation. Separate new heater cores, evaporators, blowers, final stages, actuators, sensors and seals can be considered only through the exact VIN/equipment catalog and are not a substitute for proving a used loaded case. Heater-only, E83, RHD, universal HVAC, race-delete and manual-to-automatic climate conversion packages are outside this identification claim.

BMW 64118372792 identifies an empty A/C housing, not a guaranteed complete E46 heater box. Match both VINs/builds, LHD body/drivetrain and installed IHKA versus IHKR equipment; photograph every label and itemize the core, evaporator, blower/final stage, doors, actuators, sensors, harness, ducts, tubes, drain, seals and hardware. Reject cracked, seized, cut, contaminated, moldy, flood/fire-exposed or incomplete donors. Qualified refrigerant recovery and dash/restraint precautions are required.

Supersede reviewed 14 unique research sources for this guide. 5 also appear above as a seller or official action and are not repeated here; 9 additional citations follow.

Research last verified 2026-08-06.

1. RealOEM — showpartsOpen source
2. RealOEM — showpartsOpen source
3. Bmwpartsdeal — housing parts air conditioningOpen source
4. Bmwpartsdeal — electric parts for ac unitOpen source
5. Ia801005 us archive — 12 IHKA E46Open source
6. Ia801005 us archive — 13 IHKR E46Open source
7. Bmwrepairguide — ST054 Climate ControlOpen source
8. EPA — regulatory requirements mvac system servicingOpen source
9. NRF — NRF Heater catalogOpen source