1992 MAZDA PROTEGE Workshop Manual

HEATER U
HEATER UNIT
Removal / Installation
1. Drain the engine coolant.
2. Remove the dashboard. (Refer to Section S.)
3. Remove as shown in the figure.
4. Install in the reverse order of removal
Note
l When disconnecting the heater hose from the heater core, unlock the hose connector at the
heater core side.
l When installing the heater hose on the heater core, verify that the hose connector is securely
locked.
l Release the clamp, and remove the seal plate together with the heater unit.
1. Seal plate 3. Heater hose
2. Hose connector
4. Heater unit
u-21

U HEATER
Disassembly / Assembly
1. Disassemble in the order shown in the figure.
2. Check for the following and repair or replace the heater core as necessary.
@Cracks, damage, and water leakage.
@Bent fins.
@Distorted and bent inlet.
3. Assemble in the reverse order of disassembly.
1
-
1. Heater core 3. Mix door assembly
2. Mode door assembly 4. Heater unit case
u-22

HEATER U
BLOWER UNIT
Removal / Installation
1. Remove the glove box. (Refer to Section S.)
2. Remove as shown in the figure.
3. Install in the reverse order of removal.
____..
Note
l Release the clamp, and remove the seal plate together with the blower unit.
1. Seal plate 2. Blower unit case
U-23

U HEATER
Disassembly / Assembly
Disassemble and assemble the blower unit as shown in the figure.
I
f-4
@X1; ;:‘::j: :‘.;.; .,,,
:. ..
Q . ...;,
: ., ‘,:
-,: ,..’
, :
03uoux-01
1. Resistor assembly 3. Blower fan 5. Ret-Fresh door assembly
Inspection . . . . . . . . page U-25
4. Blower motor
2. Blower unit case Inspection . . . . . . . . page U-25
U-24

HEATER U
23UOUX-01
23uoux-02
Inspection
Blower motor
1, Remove the glove box. (Refer to Section S.)
2. Disconnect the blower motor connectors.
3. Verify that the blower motor runs when connecting battery
voltage to terminal a and grounding terminal b.
4. If not as specified, replace the blower motor.
Resistor assembly
1. Remove the glove box. (Refer to Section S.)
2. Disconnect the resistor assembly connectors.
3. Check continuity between terminals.
G-O: Indicates continuity
4. If not as specified, replace the resistor assembly.
u-25

U HEATER
HEATER CONTROL UNIT
Removal / Installation
1. Disconnect the negative battery cable.
2. Remove in the order shown in the figure.
3. Install in the reverse order of removal.
Note
l After installing the Mix, Mode, and Ret-Fresh wires. verifv that each lever moves its full stroke.
1. Side panel
2. Lower panel (R.H.)
3. Lower panel (Center)
4. Meter hood 5. Glove box
6. Glove box cover
7. Mode wire
8. Mix wire
9. Ret-Fresh wire
IO. Heater control assembly
U-26

Disassembly / Assembly
HEATER U
Disassemble and assemble the heater control unit as shown in the figure.
--
03uoux-041
1. Knob
5. Mode wire 7. Ret-Fresh lever
2. Switch panel Adjustment . . . . . . . page U-28
8. Mode lever
3. Switch body 6~ Mix wire 9. Mix lever
4. Ret-Fresh wire
Adjustment....... page U-28 10. Blower switch
Adjustment . . . . . . . page U-28
Inspection . . . . page U-28
U-27

HEATER
Inspection
Blower switch
1. Check continuity between terminals of the blower switch.
Terminals
SW’TCH a b c d e f g h
OFF 0 0
0 0
-
03uoux-01
U-28
mm (in)
I - I I I ” I I I 7- I
m: Indicates continuity
2. If not as specified, replace the blower switch.
Adjustment
Ret-fresh wire
1. Set the Fiec-Fresh lever to fresh position.
2. Connect the Ret-Fresh wire to the Ret-Fresh door.
3. Set the door to fresh position and clamp the wire into place.
4. Verify that the Ret-Fresh lever moves its full stroke.
Mix wire
1, Set the Mix lever to cold position.
2. Connect the Mix wire to the Mix door.
3. Set the door to cold position and clamp the wire into place.
4. Verify that the Mix lever moves its full stroke.
Mode wire
1. Set the mode lever at defrost position.
2. Remove the mode wire from clip A.
3. Align the set pin hole at B of the link with the matching hole
of the heater unit. If a pin (0.24 in in diameter) is available,
insert it to fix the link to the correct position.