Warning: The air conditioning system is under high pressure. Do not attempt to fill the system yourself.
Air conditioning system
1. Fig. 13.1a shows the main components of the air conditioning system. To ensure efficient operation of the air conditioner, perform the following tasks:
- a) Inspect the compressor drive belt; replace it if worn or damaged.
- b) check and, if necessary, adjust the belt tension (see Chapter 1).
- c) check the condition of the hoses and connection points for leaks.
- d) Keep the air conditioner grille clean. Remove dirt from the grille by blowing it out with compressed air.
- d) Make sure that the system is sufficiently charged with refrigerant.
- e) If you hear the sound of dripping water or find liquid on the floor mats, drain the condensate from the evaporator housing (see fig. 13.16). clearing the drainage pipes.
Fig. 13.1a Air conditioning system: 1 - control panel; 2 - fan casing; 3 - evaporator; 4 - filling diaphragm; 5 - electromagnetic control valve; 6 - compressor; 7 - receiver-dryer; 8 - capacitor.
Fig. 13.16 The drain pipe (arrow) is located under the instrument panel in the center of the car
2. It is advisable to turn on the system for 10 minutes once a month. This is especially important during the winter months, as long periods of downtime have a negative impact on the condition of the system components.
3. Major repairs to the air conditioning system can only be carried out in a specialized workshop. However, minor repairs are possible and are described in this chapter.
4. In most cases, poor air conditioning performance is due to loss of refrigerant.
5. When the system is operating, look through the viewing window (see fig. 14.3). If the refrigerant appears foamy, it is low. Fill the system (see below).
Fig. 13.5 The viewing window on most models is located at the left front corner of the engine compartment. On some models it is located at the top of the receiver-dryer (see fig. 14.3)
Refrigerant addition
6. Buy a can of refrigerant. The can contains about 400 grams of refrigerant, a tap plug, and a piece of tubing to connect to the low-pressure system of the air conditioner.
Note: Never connect the canister to the high-pressure side. Since one canister may not be enough for refilling, buy several refilling containers at once. It is advisable to use red refrigerant for refilling, which will help quickly identify possible leaks.
Caution: Wear safety glasses when refueling.
7. Use the can according to the manufacturer's instructions.
8. Warm up the engine and turn on the air conditioner.
9. Install the thermometer 8 in the center of the air flow grille (see fig. 13.9) and add refrigerant until the temperature shown on the thermometer becomes about 5-8 degrees Celsius.
Fig. 13.9 Placing the thermometer on the ventilation grille
Heating system
10. If the incoming air from the heater is cold, this may be due to the following reasons:
- a) the thermostat is fully open and prevents the engine from warming up normally. Replace the thermostat (see Section 3).
- b) the hoses are pinched, thereby stopping the flow of coolant through the heater radiator. Touch the hoses. They should be warm. If they are cold, one of the hoses has flow resistance or the control valve is closed. Disconnect the hoses and flush the radiator. If the radiator core is clean, but circulation is not restored, remove both hoses and flush them.
- c) If you were unable to flush the hoses, replace them.
11. If the blower speed does not match the switch position, check the switch operation, resistance on the motor, motor, electrical circuits and fuses.
a) First check the integrity of the fuses.
b) check the voltage at the motor terminals.
c) remove the heating/air conditioning system control unit (see Section 12) so far that there is access to the contacts of the heater fan switch. If there is no voltage on the switch, the problem is in the circuit between the battery and the switch (see wiring diagram at the end of this manual).
d) when checking the motor resistance, make sure there is voltage on it. The resistance is located on the heater fan motor at the bottom of the glove compartment (see fig. 13.11).
- 1) If there is no voltage on the resistor, check the wiring.
- 2) if the wiring is OK, replace the switch (see section 12).
d) Using a voltmeter or test lamp, check for voltage on the engine. If there is no voltage, replace the resistor.
Fig. 13.11 The heater motor resistor (arrow) is located below the right side of the instrument panel behind the engine
12. If air does not pass through the grilles:
- a) Turn on the ignition and start the blower motor. Most motors can be heard through the air vents.
- b) if the engine cannot be heard, there is a high probability that it is faulty (before this, you should have already made sure that the motor resistance and switch are working properly) see Section 10.
Note: You can determine the condition of the fan motor by directly connecting it to the battery.
13. If the mat under the heater casing is wet or antifreeze vapors are coming through the heater grille, then the heater radiator core is clearly damaged (leaks).
(Based on materials from the website hondabook.ru)