Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA1993ACCORD L4-2156CC 2.2L SOHCREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONAIR DELIVERY CIRCUITS
1993 Honda Accord L4-2156cc 2.2L SOHC
Air Delivery Circuits
1993 Honda Accord L4-2156cc 2.2L SOHCSECTION Air Delivery Circuits
The air delivery system directs the flow of air used by the heater and air conditioner systems.
Mode Selection
On models equipped with the button type air delivery system, mode selection is controlled by the mode switches in the heater control panel and the heater mode control motor. When you select a specific mode, voltage is applied through the dimming circuit to the LED, which comes on, indicating the mode selected. Ground is provided to the heater mode control motor through that mode switch. The motor then runs until the air control door reaches the proper position.
On models equipped with the lever type (non-electrical) air delivery system, mode selection is controlled by a cable.
Fresh/Recirculation Selection
When you press the recirculation button, a ground signal is sent from the heater control panel to the recirculation control motor. The motor then runs until the limit switch opens. Pressing the button also applies voltage through the dimming circuit to the recirculate LED, and the LED comes on. The fresh air mode works similarly.
Mode Selection
On models equipped with the button type air delivery system, mode selection is controlled by the mode switches in the heater control panel and the heater mode control motor. When you select a specific mode, voltage is applied through the dimming circuit to the LED, which comes on, indicating the mode selected. Ground is provided to the heater mode control motor through that mode switch. The motor then runs until the air control door reaches the proper position.
On models equipped with the lever type (non-electrical) air delivery system, mode selection is controlled by a cable.
Fresh/Recirculation Selection
When you press the recirculation button, a ground signal is sent from the heater control panel to the recirculation control motor. The motor then runs until the limit switch opens. Pressing the button also applies voltage through the dimming circuit to the recirculate LED, and the LED comes on. The fresh air mode works similarly.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.