Operational Check

Operational Check
The purpose of the operational check is to confirm that the system operates properly.

Conditions : Engine running at normal operating temperature

CHECKING BLOWER
1. Turn blower control dial clockwise to "1" position. Blower should operate on low speed.
2. Turn blower control dial clockwise to "2" position, and continue checking blower speed until all speeds are checked.
3. Leave blower on Maximum speed.

If NG, go to trouble diagnosis procedure for MTC-33, "Front Blower Motor Circuit". Front Blower Motor Circuit
If OK, continue the check.

CHECKING DISCHARGE AIR
1. Turn mode door control dial to each position.
2. Confirm that discharge air comes out according to the air distribution table. Refer to "Discharge Air Flow".

If NG, go to trouble diagnosis procedure for MTC-31, "Mode Door". Mode Door Motor Circuit
If OK, continue the check.




CHECKING RECIRCULATION

CHECKING TEMPERATURE DECREASE
1. Turn temperature control dial counterclockwise to full cold position.
2. Check for cold air at discharge air outlets.

If NG, go to trouble diagnosis procedure for MTC-45, "Insufficient Cooling". Insufficient Cooling
If OK, continue the check.

CHECKING TEMPERATURE INCREASE
1. Turn temperature control dial clockwise to full hot position.
2. Check for hot air at discharge air outlets.

If NG, go to trouble diagnosis procedure for MTC-52, "Insufficient Heating". Insufficient Heating
If OK, continue the check.

CHECKING A/C SWITCH (IF EQUIPPED)
1. Turn fan control dial to the desired (1 to 4 speed) position.
2. Press A/C switch.
3. A/C switch indicator will turn ON.
- Confirm that the compressor clutch engages (sound or visual inspection).

If NG, go to trouble diagnosis procedure for MTC-37, "Magnet Clutch Circuit (If Equipped)". Magnet Clutch Circuit (If Equipped)
If OK, continue the check.




CHECKING DEFROST A/C SWITCH (IF EQUIPPED)