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 Jim Grant's Tech Tips '02 Honda Accord EX, Knocking A/C
Q: I am having problems with the A/C on my ‘02 Honda Accord EX. When the internal cabin temp is hot and the A/C is started it up, there is loud horrible "knocking" noise from underneath the passenger side dash. When I turned the A/C off, the noise went away. When I turned the A/C back on, the noise returns, but the noise goes away in the night. The car has done only 32K but is over 3 years old. What could that knocking be from under the passenger side dash? Is it low on coolant? Leaves blocking something? A: Your vehicle was manufactured with 2 possible climate control systems. Both systems have electric motors in the heater box. What I’m wondering is if one of the motors is not operating correctly and what you’re hearing is that motor and the door that it operates fighting with each other. You might even be able to retrieve diagnostic information from the control panel of your Honda. With the ignition on, fan switch off and the recirculation control switch in the recirculate mode (indicator light will be on), press and hold the recirculation control switch to fresh. At that point, the indicator light will go out. Hold the switch until the indicator light turns back on for about 2 seconds, then the light will flash to indicate a faulty system component. To get closer to the source of the noise you may want to remove the glove box, this will allow for closer inspection.
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