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 Troubleshooting
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 (
Recirculation Control Motor
Circuit Troubleshooting
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
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
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:
Rear Window Defogger
The rear window defogger will clear
fog, frost, and thin ice from the
window. Push the defogger button to
turn it on and off. The indicator in
the button comes on to show the
defogger is on. It also shuts off when
you turn off the ignition switch. You
have to turn the defogger on a
Sound Quality Diagnosis
Special Tools Required
Diagnostics CD 07AAZ-SDBA100
Use the following tests to check sound quality.
NOTE: Before beginning the following tests, write down
the customer's bass, treble, fader and balance settings,
and then set them to their center positions for testing.
Left/Right Channel 10
Do this
