Honda 2004 Odyssey Service Manual page 1542

System Description
The air conditioning system removes heat from the passenger compartment by circulating refrigerant through the
system as shown below.
EVAPORATOR EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator)
A/C PRESSURE SWITCH
(Triple function)
When the refrigerant is below
2
196 kPa (2.0 kgf/cm , 28 psi)
2
or above 3,140 kPa (32 kgf/cm ,
455 psi), the A/C pressure
switch opens the circuit to
the A/C switch and stops the
air conditioning to protect the
compressor.
When the refrigerant is above
2
1,520 kPa (15.5 kgf/cm ,
220 psi), the A/C pressure
switch switches the radiator and
condenser fans to high speed.
This vehicle uses HFC-134a (R-134a) refrigerant which does not contain chlorofluorocarbons. Pay attention to the
following service items:
• Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
• Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (DENSO ND-OIL 8) designed for the R-134a
compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in
compressor failure.
• All A/C system parts (compressor, discharge line, suction line, evaporator, condenser, receiver/dryer, expansion
valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange with R-12 parts.
• Use a halogen gas leak detector designed for refrigerant R-134a.
• R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging
station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service R-134a air conditioning
system.
• Always recover the refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting
any A/C fitting.
BLOWER FAN
CONDENSER
(Radiation of heat)
EVAPORATOR
(Absorption of heat)
EVAPORATOR TEMPERATURE
SENSOR
A/C COMPRESSOR RELIEF VALVE
(Relieves pressure at the
compressor when the
pressure is too high)
RECEIVER/DRYER
(Traps debris, and
removes moisture)
A/C COMPRESSOR
(Suction and compression)
HIGH PRESSURE VAPOR
HIGH PRESSURE LIQUID
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR
(cont'd)
21-11