Honda CR-V: System Description
The air conditioning system removes heat from the passenger compartment by
transferring heat from the ambient air
to the evaporator. The evaporator cools the air with the refrigerant that is
circulating through the evaporator. The
refrigerant expands in the evaporator, and the evaporator becomes very cold and
absorbs the heat from the ambient
air. The blower fan pushes air across the evaporator where the heat is absorbed,
and then it blows the cool air into the
passenger compartment.

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
(SP-10) designed for the R-134a A/C
compressor. Intermixing the recommended (PAG) refrigerant oil with any other
refrigerant oil will result in A/C
compressor failure.
- All A/C system parts (A/C compressor, discharge line, suction line,
evaporator, A/C 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 the R-134a air
conditioning systems.
- Always recover refrigerant R-134a with an approved
recovery/recycling/charging station before disconnecting any
A/C fitting.
Oil Separator
Oil emission from the A/C compressor to the A/C line is reduced by placing
the oil separator in the A/C compressor.
This results in a thinner oil film inside of the heat exchangers (A/C condenser
and evaporator). Air conditioning
efficiency is increased without sacrificing engine performance.

A/C Pressure Sensor
The A/C pressure sensor converts A/C pressure into electrical signals to the
PCM.
NOTE: The pressures can be monitored using the HDS PGM-FI Data List.

The response of the A/C pressure sensor is shown in the graph.

Heating/Air Conditioning Door Positions


HVAC Control Unit Inputs and Outputs

CONNECTOR A

Circuit Diagram


READ NEXT:
DTC indicator 1: An Open in the Air Mix
Control Motor Circuit
1. Start the engine.
2. Turn on the A/C, then set the temperature control
dial to Max Hot.
3. Turn the ignition switch OFF and then ON (
1. Check the No. 36 (10 A) fuse in the under-dash fuse/
relay box.
Is the fuse OK?
YES-Go to step 2.
NO-Replace the fuse, and recheck. If the fuse blows again, check for a short in
the No. 36 (10 A
NOTE:
Do not use this troubleshooting procedure if the A/C
compressor is inoperative. Refer to the symptom
troubleshooting index.
Before doing symptom troubleshooting, check for
powertrain DTCs.
SEE MORE:
Pump Replacement
1. Place a suitable container under the vehicle.
2. Drain the power steering fluid from the reservoir.
3. Remove the drive belt (A) from the pump pulley.
4. Cover the auto-tensioner, alternator, and A/C
compressor with several shop towels to protect
them from spilled power steeri
DTC P0506: Idle Control System RPM Lower
Than Expected
NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information.
1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine. Hold the engine speed
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