Control System (HVAC): Overview Mazda MX-5 NC

Scheme 11

Scheme 12

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]».)
3. Remove the following parts: Console (See «CONSOLE REMOVAL/INSTALLATION».) Glove compartment (See «GLOVE COMPARTMENT REMOVAL/INSTALLATION».) Side wall (See «SIDE WALL REMOVAL/INSTALLATION».) Console panel (See «CONSOLE PANEL REMOVAL/INSTALLATION».) Center panel unit (See «CENTER PANEL UNIT REMOVAL/INSTALLATION».) Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION».) Knee bolster Column cover (See «COLUMN COVER REMOVAL/INSTALLATION».) Driver-side air bag module (See «DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION».) Steering wheel (See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION».) Combination switch (See «COMBINATION SWITCH REMOVAL/INSTALLATION».) Steering shaft (See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION».) Meter hood (See «METER HOOD REMOVAL/INSTALLATION».) Instrument cluster (See «INSTRUMENT CLUSTER REMOVAL/INSTALLATION».) Side panel (See «SIDE PANEL REMOVAL/INSTALLATION».) Hood release lever (See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION».) Female bracket (See «CONVERTIBLE TOP DISASSEMBLY/ASSEMBLY».) A-pillar trim (See «A-PILLAR TRIM REMOVAL/INSTALLATION».) Scuff plate (See «SCUFF PLATE REMOVAL/INSTALLATION».) Front side trim (See «FRONT SIDE TRIM REMOVAL/INSTALLATION».) Fuse box No. 1 Dashboard (See «DASHBOARD REMOVAL/INSTALLATION».)
4. Remove in the order indicated in (Scheme 12).
5. Install in the reverse order of removal.

Scheme 13

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]».)
3. Remove the following parts: Console (See «CONSOLE REMOVAL/INSTALLATION».) Glove compartment (See «GLOVE COMPARTMENT REMOVAL/INSTALLATION».) Side wall (See «SIDE WALL REMOVAL/INSTALLATION».) Console panel (See «CONSOLE PANEL REMOVAL/INSTALLATION».) Center panel unit (See «CENTER PANEL UNIT REMOVAL/INSTALLATION».) Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION».) Knee bolster Column cover (See «COLUMN COVER REMOVAL/INSTALLATION».) Driver-side air bag module (See «DRIVER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION».) Steering wheel (See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION».) Combination switch (See «COMBINATION SWITCH REMOVAL/INSTALLATION».) Steering shaft (See «STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION».) Meter hood (See «METER HOOD REMOVAL/INSTALLATION».) Instrument cluster (See «INSTRUMENT CLUSTER REMOVAL/INSTALLATION».) Side panel (See «SIDE PANEL REMOVAL/INSTALLATION».) Hood release lever (See «HOOD LATCH AND RELEASE LEVER REMOVAL/INSTALLATION».) Female bracket (See «CONVERTIBLE TOP DISASSEMBLY/ASSEMBLY».) A-pillar trim (See «A-PILLAR TRIM REMOVAL/INSTALLATION».) Scuff plate (See «SCUFF PLATE REMOVAL/INSTALLATION».) Front side trim (See «FRONT SIDE TRIM REMOVAL/INSTALLATION».) Fuse box No. 1 Dashboard (See «DASHBOARD REMOVAL/INSTALLATION».)
4. Remove in the order indicated in (Scheme 13).
5. Install in the reverse order of removal.

Scheme 14

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]».)
3. Remove the following parts: Lower panel (See «LOWER PANEL REMOVAL/INSTALLATION».) Knee bolster
4. Remove in the order indicated in (Scheme 14).
5. Install in the reverse order of removal.

Scheme 15

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]».)
3. Remove in the order indicated in (Scheme 15).
4. Install in the reverse order of removal.

Scheme 16

1. Connect battery positive voltage to blower motor terminal A, ground to terminal B, and then verify that the blower motor operates smoothly. If the operation condition is not normal, replace the blower motor.

Scheme 17

1. Remove the battery cover.
2. Disconnect the negative battery cable. (See «BATTERY REMOVAL/INSTALLATION [LF]».)
3. Disconnect the power MOS FET connector.
4. Remove the power MOS FET (Scheme 17)
5. Install in the reverse order of removal.
6. Perform the refrigerant system performance test. (See «REFRIGERANT SYSTEM PERFORMANCE TEST»(/mazda/mx-5/nc-2005-2008/remont/manual-hvac-system/#refrigerant-system-hvac).)

Scheme 18

1. Verify that the resistance between the terminals of the power MOS FET is as shown in «TERMINALS RESISTANCE TABLE». If there is any malfunction, replace the power MOS FET.

POWER MOS FET RESISTANCE TABLE

Scheme 19

1. Disassemble in the order indicated in (Scheme 19).
2. Assemble in the reverse order of disassembly.
3. Adjust the magnetic clutch clearance. (See «MAGNETIC CLUTCH ADJUSTMENT».)

Scheme 20

1. When removing or installing the bolt, hold the pressure plate (Scheme 20)

Scheme 21

1. Remove the snap ring using a snap ring pliers.

Scheme 22

Scheme 23

1. Remove the A/C compressor pulley using the SST (49 0839 425C) . CAUTION: Be careful that the SST (49 0839 425C) tabs do not hang over the stator.

Scheme 24

1. Align the positioning pin with the hole of A/C compressor body and insert.

Scheme 25

1. Install the inner wheel of the pulley using a plastic hammer and SST (49 B018 003) to the compressor. CAUTION: If the SST is not properly positioned when the A/C compressor pulley is press-fit, the A/C compressor axle will interfere with the SST, possibly damaging component parts. Verify that the SST and axle are properly positioned and perform the procedure very carefully.

Scheme 26

1. First, insert the 1 mm (0.039 in) thick shim into the shaft.

Scheme 27

1. Measure the clearance around the entire circumference between the pressure plate and A/C compressor pulley using a thickness gauge
2. Inspect the clearance. If not within the specification, adjust the clearance by changing the shim or the number of shims. Magnetic clutch clearance 0.3-0.6 mm {0.012-0.023 in}

Scheme 28

Scheme 29

1. Connect battery positive voltage to magnetic clutch terminal A and ground.
2. Verify that the magnetic clutch turns on. If the magnetic clutch does not turn on, replace the A/C compressor.

See also:
• REFRIGERANT SYSTEM PERFORMANCE TEST
• REFRIGERANT CHARGING