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Honda Accord: How to Unclog A/C Evaporator

The A/C is a complex system; however, there's one easy way to fix it if cold air doesn't come out. You might even have fun doing it. Continue reading to learn how to unclog the A/C evaporator on your Honda Accord.

By Jerry Perez - March 18, 2015

This article applies to the Honda Accord (1990-2002).

Your A/C may not be in the best shape to perform. As air runs through a series of tubes and components of the A/C system, the evaporator removes hot air from inside the cabin to turn it into frigid, cool air. During that process, the evaporator also produces condensation, which is then dripped through a tube and released underneath the car. This system can sometimes become clogged, resulting in blazing hot air. To unclog it, follow these easy steps.

Materials Needed

  • Shop vacuum
  • Towel
  • Piece of 5/16 rubber tubing
  • Duct tape

Step 1 – Prep the work area and assemble the vacuum

The evaporator is located beneath the glove box, so this procedure will take place in the passenger's side area. Slide the seat as far back as it will go, and lay down a towel to protect your carpeting from getting wet.

To assemble the vacuum, insert a 5/16 rubber hose into the end of the vacuum's hose. Use the duct tape to bind them together.

  • Figure 1. The evaporator is located on the passenger's side.
  • Figure 2. Tape the rubber hose to the vacuum hose.

Step 2 – Remove the drain tube

The drain tube is located underneath the glove box compartment. It is a black rubber hose in between two bolts. Tightly grip the hose, and pull it towards you. It should come straight out.

  • Figure 3. Location of the evaporator drain tube.
  • Figure 4. A removed drain tube.

Pro Tip

Before beginning, make sure the car or A/C was not used in the past few hours to avoid coming across any excessively cold and hot parts, as well as any large amounts of condensation.

Step 3 – Unclog the evaporator

Connect the 5/16 rubber hose from the vacuum, and make sure it tightly fits. Then turn on the vacuum, and let it run for a minimum of five minutes. The evaporator drain tube should be completely unclogged, and the A/C in full working condition.

Figure 5. Connect the drain tube hose to the vacuum.

Step 4 – Test the A/C

Disconnect the vacuum hose from the drain tube. Start your car, and let it run for a couple minutes. Finally, turn on your A/C to make sure that cold air is coming out.

Figure 6. The unclogged evaporator may leak water.

Pro Tip

It is common for the water to leak outside of the car once this procedure is completed.

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