2009 Intermittent A/C Blower
05-27-2011
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2009 Intermittent A/C Blower
I have a 2009 Civic Ex-L that has an A/C problem. Here is what I know:
- the blower seems to not work more often when ambient temperature is hot and the car has been sitting without the engine on
- no amount of punching buttons on the dashboard seem to bring the A/C blower back on; it just comes back on after a random amount of time.
- I don't know how to cause the failure so I don't have any clear cause and effect for this
- when this happens the blower is not moving the air but the air does seem to be cold; I verified this by driving and just opening the vent to get some amount of air flow
My mechanic can't seem to find a problem since we can't cause the problem to occur at will.
Does anyone have any suggestions on what to look for?
thanks!
- the blower seems to not work more often when ambient temperature is hot and the car has been sitting without the engine on
- no amount of punching buttons on the dashboard seem to bring the A/C blower back on; it just comes back on after a random amount of time.
- I don't know how to cause the failure so I don't have any clear cause and effect for this
- when this happens the blower is not moving the air but the air does seem to be cold; I verified this by driving and just opening the vent to get some amount of air flow
My mechanic can't seem to find a problem since we can't cause the problem to occur at will.
Does anyone have any suggestions on what to look for?
thanks!
06-21-2011
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Run the diagnostic test:
To run the self-diagnostic function, do the following:
1. Turn the ignition switch OFF.
2. Press and hold the recirculation control and rear window defogger buttons, and turn the ignition switch ON (II)
3. Recirculation indicator turns on for 2 seconds, then self-diagnostic function begins.
NOTE:
•The blower motor will run at any speed regardless of the dial positioning.
•In the case of multiple problems, the recirculation indicator will blink the lowest number DTC only.
•If no DTCs are found, the indicator will not blink.
DTC (Recirculation Indicator Blinks) Detection Item
1 An open in the air mix control motor circuit
2 A short in the air mix control motor circuit
3 A problem in the air mix control linkage, door, or motor
4 An open or short in the mode control motor circuit
5 A problem in the mode control linkage, doors, or motor
6 A problem in the blower motor circuit
7 HVAC control unit internal error
8 An open in the evaporator temperature sensor circuit
9 A short in the evaporator temperature sensor circuit
Clear the DTCs
1. Turn the ignition switch OFF.
2. Set fan control dial OFF, temperature control dial on MAX COOL.
3. Press and hold the ventilation and recirculation control buttons, turn the ignition switch ON (II).
4. Ventilation indicator turns on for 2 seconds, then DTC clear.
NOTE: After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.
1. Turn the ignition switch OFF.
2. Press and hold the recirculation control and rear window defogger buttons, and turn the ignition switch ON (II)
3. Recirculation indicator turns on for 2 seconds, then self-diagnostic function begins.
NOTE:
•The blower motor will run at any speed regardless of the dial positioning.
•In the case of multiple problems, the recirculation indicator will blink the lowest number DTC only.
•If no DTCs are found, the indicator will not blink.
DTC (Recirculation Indicator Blinks) Detection Item
1 An open in the air mix control motor circuit
2 A short in the air mix control motor circuit
3 A problem in the air mix control linkage, door, or motor
4 An open or short in the mode control motor circuit
5 A problem in the mode control linkage, doors, or motor
6 A problem in the blower motor circuit
7 HVAC control unit internal error
8 An open in the evaporator temperature sensor circuit
9 A short in the evaporator temperature sensor circuit
Clear the DTCs
1. Turn the ignition switch OFF.
2. Set fan control dial OFF, temperature control dial on MAX COOL.
3. Press and hold the ventilation and recirculation control buttons, turn the ignition switch ON (II).
4. Ventilation indicator turns on for 2 seconds, then DTC clear.
NOTE: After completing repair work, run the self-diagnostic function again to make sure that there are no other malfunctions.
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