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Topic
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2006 Honda Accord I4 Sedan, 240,000 km, A/C is not working.
1. New cabin filter
2. With the A/C button set to on, start my Accord while watching the a/c compressor clutch under the hood.
– A/C clutch engaged 10 seconds after the engine was running
– A/C clutch disengaged after 10 second. I felt cold air coming from vents for a short time after starting my Accord.
– A/C clutch will not be engaged again until I restart my Accord.
– Can I assume that
a. Clutch coil is good
b. Wirings are good
c. Clutch relay is good – signal side as well as the load side
d. Clutch fuse is good3. I don’t have an A/C manifold gauges kit to test the refrigerant pressure. Without the gauges, I don’t know the condition of the refrigerant.
a. Can I assume that the refrigerant is good as the low pressure switch will prevent the clutch from engaging.
b. I will buy an A/C manifold gauges kit if it will help me to diagnose where is the problem.4. The blower is on full speed as soon as I started my Accord. The blower speed control has no control of the fan speed. 2006 Accord has a blower transistor (not resistor). I will replace it with a new blower transistor when I receive it. Is the A/C has anything to do with the blower transistor not functioning in Accord.
Any suggestions to troubleshoot the A/C system as I don’t want to be a part switcher.
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Replies
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It sounds as if the compressor is kicking out on low pressure.
But without a manifold set to confirm that, it would only be a guess.
As to the cabin blower.
I would think it independent.
Do you have any speed control over the blower when the AC is switched off?Yes. The blower motor is on full speed as soon as my Accord is started independent of heat or A/C selected. I know I need to change the blower transistor to fix the speed control.
If so, then you’ve solved one issue.
A set of manifold gauges should set you on to what trouble the AC system has.Finally, I received the 2SK2313 N-channel MOSFET and EYP2BN110 thermal fuse to rebuild my 2006 Accord blower transistor. I applied Arctic MX-4 between the heat sink and these two components.
Now, I can control the speed of the blower and the A/C is working too. The Accord climate control must be monitoring the blower and disable the A/C clutch. This may explain the reason why that the A/C clutch was only engaged for a few seconds after starting my Accord.
I learn a lot about how A/C works and troubleshooting technique. I am ready when my A/C fails in any of my cars. After watching Eric’s cleaning condenser video, I will clean the condensers in my cars next couple of weeks to make sure that the A/C compressors are not working too hard.
Now, I can control the speed of the blower and the A/C is working too. The Accord climate control must be monitoring the blower and disable the A/C clutch. This may explain the reason why that the A/C clutch was only engaged for a few seconds after starting my Accord.
I do not think this logic is correct.
I’ve seen many vehicles run at startup with the AC selected and blowers on high with out issue.
I would be more inclined to believe the component failure in the climate control circuit was the cause and is what is being monitored, not the blower or its speed setting.How do you explain that I can turn the a/c off and on after the blower transistor assembly rebuilt?
But I report back after running the a/c for a week.
Now, I cannot do the test as I already fixed the blower transistor.
Before the blower transistor rebuilt,
1. I cannot adjust the speed of the blower.
2. The blower is always on full speed.
3. A/C came on for a few seconds after starting my Accord with a/c onAfter the blower transistor rebuilt, the a/c and blower works as normal for the last 12 years.
Your statement was:
Now, I can control the speed of the blower and the A/C is working too. The Accord climate control must be monitoring the blower and disable the A/C clutch. This may explain the reason why that the A/C clutch was only engaged for a few seconds after starting my Accord.
I say this is false.
If, in your words “Accord climate control must be monitoring the blower”
If you set the blower to high ..same condition before the fix. Not the climate control logic , but the blower set on max.
According to your statement the conditions are the same, blower on max when the car is started.
In which the AC will stop working.
My thought is the climate control circuit logic is being monitored not the blower as a fail safe and shuts off the AC.
So you can do the test.I’d bet the AC will operate just fine no matter what blower speed you select which shows the climate control logic is what is being monitored.
Not saying if the blower motor were to fail it would also shut down the AC, that may also be true.
Again a simple test to prove out.
Unplug the blower and switch the AC on.
If the compressor runs then the monitor is on the climate control logic.
If the AC switches off the monitor also checks for a failure of the blower motor circuit.
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