Acura RL. Manual - part 574

18. Disconnect the jumper wire.  

19. Disconnect the A/C compressor clutch 3P connector.  

20. Check for continuity between the A/C compressor clutch relay 4P socket No. 2 terminal and the A/C 

compressor clutch 3P connector No. 1 terminal. 

Fig. 80: Checking Continuity Between A/C Compressor Clutch Relay 4P Socket 2 Terminal And
A/C Compressor Clutch 3P Terminal 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

Is there continuity?  

YES - Check the A/C compressor clutch clearance, and the A/C compressor clutch field coil (see A/C 
COMPRESSOR CLUTCH CHECK ). Repair as needed. 

NO - Repair open in the wire between the A/C compressor clutch relay and the A/C compressor 
clutch. 

IN-CAR TEMPERATURE SENSOR TEST 

1. Remove the in-car temperature sensor (see IN-CAR TEMPERATURE SENSOR 

REPLACEMENT ).  

2. Compare the resistance reading between the No. 2 and No. 3 terminals of the in-car temperature 

sensor with the specifications shown in the graph; the resistance should be within the specifications 
for whatever the ambient temperature is. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

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Fig. 81: Resistance And Temperature Graph 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. If the resistance is not as specified, replace the in-car temperature sensor (see IN-CAR 

TEMPERATURE SENSOR REPLACEMENT ). 

4. Connect battery power to the No. 1 terminal of the in-car temperature sensor, and ground the No. 4 

terminal; the aspirator fan should run.  

5. If the aspirator fan did not run in step 4, replace it (see IN-CAR TEMPERATURE SENSOR 

REPLACEMENT ).  

IN-CAR TEMPERATURE SENSOR REPLACEMENT 

1. Remove the in-car temperature sensor (A) from the driver's dashboard lower cover, then disconnect 

the 4P connector (B). 

Fig. 82: Identifying In-Car Temperature Sensor And 4P Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC.

NOTE:

Incorrectly applying power and ground to the in-car temperature sensor 
will damage it. Follow the instructions carefully.

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

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2. Install the sensor in the reverse order of removal.  

VENT AIR TEMPERATURE SENSOR TEST 

1. Remove the driver's vent air temperature sensor (see DRIVER'S VENT AIR TEMPERATURE 

SENSOR REPLACEMENT ). or passenger's vent air temperature sensor (see PASSENGER'S 
VENT AIR TEMPERATURE SENSOR REPLACEMENT ).  

2. Check for a change in resistance by heating the sensor with a hair dryer or cooling the sensor in a cool 

cup of water.  

3. Compare the resistance reading between the No. 1 and No. 2 terminals of the vent air temperature 

sensor with the specifications shown in the graph; the resistance should be within the specifications. 

Fig. 83: Resistance And Temperature Graph 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

4. If the resistance is not as specified, replace the driver's vent air temperature sensor (see DRIVER'S 

VENT AIR TEMPERATURE SENSOR REPLACEMENT ) or passenger's vent air temperature 
sensor (see PASSENGER'S VENT AIR TEMPERATURE SENSOR REPLACEMENT ).  

DRIVER'S VENT AIR TEMPERATURE SENSOR REPLACEMENT 

1. Remove the gauge control module (see GAUGE CONTROL MODULE REPLACEMENT ).  

2. Disconnect the connector (A) from the driver's vent air temperature sensor. Remove the driver's vent 

air temperature sensor (B). 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

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Fig. 84: Identifying Driver's Vent Air Temperature Sensor And Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Install the sensor in the reverse order of removal.  

PASSENGER'S VENT AIR TEMPERATURE SENSOR REPLACEMENT 

1. Remove the glove box (see GLOVE BOX REMOVAL/INSTALLATION ).  

2. Disconnect the connector (A) from the passenger's vent air temperature sensor. Remove the 

passenger's vent air temperature sensor (B). 

Fig. 85: Identifying Passenger's Vent Air Temperature Sensor And Connector 
Courtesy of AMERICAN HONDA MOTOR CO., INC. 

3. Install the sensor in the reverse order of removal.  

OUTSIDE AIR TEMPERATURE SENSOR TEST 

1. Remove the outside air temperature sensor (see OUTSIDE AIR TEMPERATURE SENSOR 

REPLACEMENT ).  

2. Dip the sensor in ice water, and measure the resistance. Then pour warm water on the sensor, and 

check for a change in resistance.  

3. Compare the resistance reading between the No. 1 and No. 2 terminals of the outside air temperature 

sensor with the specifications shown in the graph; the resistance should be within the specifications. 

 

2007 Acura RL 

2005-08 HVAC HVAC - RL

  

me 

 

Friday, June 05, 2009 2:25:43 PM

Page 82 

© 2005 Mitchell Repair Information Company, LLC.