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NA and NB Miata Under-Dash HVAC Modules: Heater, Evaporator and Blower Case Identification
US/LHD 1990-1997 NA and 1999-2005 NB Mazda MX-5 Miata factory under-dash heater, evaporator/cooling and blower housing modules. Select each module separately by recipient VIN/generation, production and factory A/C equipment; verify installed/service identity, core or valve interfaces, doors/linkages/cables, firewall ports, drain, ducts, wiring and written contents. Exclude the US 1998 gap, NC/ND, non-US/RHD assumptions, universal under-dash systems, unsupported whole-case or NA/NB interchange, contaminated or cracked donors and any unqualified refrigerant or hot-coolant service.
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View listing at PartsGeek; opens in a new tabWhat you need to know
Treat the under-dash system as three adjacent modules: blower, evaporator/cooling unit and heater/air-mix unit. Start with recipient VIN/generation, production and factory-A/C status; then compare the installed label or molded case identity, firewall tube and drain locations, duct joints, mounting tabs, blower connector/resistor interface, temperature and mode doors/linkages/cables, core or evaporator size, expansion valve and every bracket, clamp, seal and fastener. Seller words complete box are not an inventory: require written confirmation of heater core, evaporator core, expansion valve, blower motor/fan, resistor, thermostat/sensor, doors/linkages/cables, drain tube, ducts, wiring and hardware. Reject cracked or warped cases, broken tabs, seized doors, stripped cable mounts, coolant or refrigerant-oil residue, corrosion, fire/flood exposure, rodent nesting, mold, heavy debris, odor, cut harnesses, kinked tubes or unknown disinfectant/coating. Pressure-test new or verified cores separately before major dash labor. Recover refrigerant with approved equipment before opening an A/C circuit; cool and depressurize the engine cooling system before heater work. Use a qualified HVAC technician, current Mazda procedures and new seals as required. MIA-0012 retains hose/leak work, MIA-0037 retains blower/resistor diagnosis and MIA-0039 retains compressor/refrigerant-system selection.
OEM numbers
NA EVAPORATOR MODULE: NA75-61-520Dupper case NA01-61-J20 for 1990-1993 and NA01-61-J01A for 1994-1997lower case NC10-61-J02expansion valve NA01-61-J14 for 1990-1993 and NA75-61-J14 for 1994-1997. NA HEATER MODULE: NA01-61-130A for 1990-1993 and NC10-61-130F for 1994-1997heater cores NA01-61-A10 versus NA75-61-A10. NA BLOWER MODULE: NA01-61-140A for 1990-1993 and NC11-61-140A for 1994-1997upper case NA01-61-B01 versus NA75-61-B01lower case NA01-61-B02 and motor NA01-61-B10. NB EVAPORATOR/COOLING REFERENCES: NC10-61-520 for checked 1999-2000 application and later catalog branches NC72-61-520D or NC72-61-520Eretain VIN/installed-number confirmation because no D-to-E chain or universal NB interchange was independently proved. NB HEATER REFERENCES: NC11-61-130E without A/C, NC72-61-130B with A/C, core NC10-61-A10A, cases NC10-61-A01 and NC10-61-A02A. NB BLOWER REFERENCE: NC11-61-140A with upper case NA75-61-B01, lower case NA01-61-B02 and motor NA01-61-B10. Shared blower identities do not prove a complete housing, wiring or generation interchange.Supersession
No new supersession chain is asserted. NC72-61-520D and NC72-61-520E are retained as production/catalog branches until a current VIN EPC proves the exact relationship. NA75-61-520D, NC10-61-520, heater assemblies and blower assemblies are separate functional modules rather than one combined HVAC-box chain. Shared NC11-61-140A, NA75-61-B01, NA01-61-B02 or NA01-61-B10 references do not prove that an NA and NB complete blower/case donor has identical wiring, ducts, seals or included equipment.
Fitment
Treat the under-dash system as three adjacent modules: blower, evaporator/cooling unit and heater/air-mix unit. Start with recipient VIN/generation, production and factory-A/C status; then compare the installed label or molded case identity, firewall tube and drain locations, duct joints, mounting tabs, blower connector/resistor interface, temperature and mode doors/linkages/cables, core or evaporator size, expansion valve and every bracket, clamp, seal and fastener. Seller words complete box are not an inventory: require written confirmation of heater core, evaporator core, expansion valve, blower motor/fan, resistor, thermostat/sensor, doors/linkages/cables, drain tube, ducts, wiring and hardware. Reject cracked or warped cases, broken tabs, seized doors, stripped cable mounts, coolant or refrigerant-oil residue, corrosion, fire/flood exposure, rodent nesting, mold, heavy debris, odor, cut harnesses, kinked tubes or unknown disinfectant/coating. Pressure-test new or verified cores separately before major dash labor. Recover refrigerant with approved equipment before opening an A/C circuit; cool and depressurize the engine cooling system before heater work. Use a qualified HVAC technician, current Mazda procedures and new seals as required. MIA-0012 retains hose/leak work, MIA-0037 retains blower/resistor diagnosis and MIA-0039 retains compressor/refrigerant-system selection.
Aftermarket options
Aftermarket evaporator and heater cores are component-level alternatives only; they do not establish whole-case interchange or include housings, doors, cables, valves, blower parts, ducts or seals. A verified new OEM module where available, a clean exact-identity donor housing rebuilt with independently verified cores/seals, or professional repair of the original case is the bounded path. Universal under-dash units, cut firewalls and mixed refrigerant conversions are engineered projects outside this guide.
Before you buy
NA/NB blower, evaporator/cooling and heater housings are separate modules; match VIN/generation, production, factory A/C, installed identity, firewall/duct/drain interfaces, doors/cables/wiring and written contents. Shared blower parts and broad seller years do not prove whole-case interchange. Reject cracks, broken tabs, seized doors, leaks, corrosion, fire/flood, mold/rodents/debris, cut wiring or kinked tubes. Cores are not complete cases. Refrigerant recovery and cooling-system service require qualified, lawful procedures.
Research and fitment sources
Supersede reviewed 12 unique research sources for this guide. 6 also appear above as a seller or official action and are not repeated here; 6 additional citations follow.
Research last verified .