Learn how to easily clean your RV's A/C unit as we show you step-by-step, demonstrating on a Dometic Brisk Air II model. Below, you will find a list of the step-by-step written instructions and tools we use during the cleaning process.
Tools & Supplies Used
Dometic A/C Coil Cleaner (Inside Air)
Frost King A/C Coil Cleaner (Outside Air)
Gloves, Spray Bottle, Rags, Kneeling Pad & Ladder
Step-by-step instructions for cleaning a Dometic Brisk Air II
Gather your tools and supplies. You'll need 1-2 cans of each A/C cleaner per unit, depending on their level of dirtiness.
Turn off power to all A/C units at the circuit breaker.
Use a Phillips head screwdriver to remove the A/C cover. Place it on the ground so it doesn't blow off the roof.
Remove any covers that easily come off of the front and back A/C coils. This will vary depending on the type of air conditioner.
Take a picture of the freeze sensor on the front A/C coil before removing it.
Place a rag in the bottom of the front A/C coil to soak up water.
Use the brush top from the Frost King A/C Coil Cleaner to remove debris from both the front and back A/C coils.
Using the Dometic A/C Cleaner, start spraying it on the front A/C coil, working your way from the bottom to the top, and then back to the bottom. Repeat the process on the backside of the front A/C coil. This A/C coil cleaner is safe to use on both the front (inside air) and back (outside air) A/C coils. We prefer to only use it on the front (inside air) A/C coil. Let it sit for 10-15 minutes.
While the front A/C coil is soaking, start cleaning the back A/C coil using the Frost King A/C coil cleaner. Spray it from the bottom until you reach the top, ensuring that the entire A/C coil is covered. Spray whatever areas you can reach on the backside of the back A/C coil and let it sit for 10-15 minutes. The Frost King A/C coil cleaner is ONLY to be used on the back coil (outside air). Do not use this cleaner on the front (inside air) A/C coil.
Use a spray bottle to lightly rinse the coils. Clean up dirty water with a rag. Be careful not to slip on the water. If your A/C coils are still very dirty, repeat the process of spraying the cleaner on them and let them both sit for another 10-15 minutes.
Looking at the photo you took, put the freeze sensor back in the front A/C coil in the same spot where you removed it.
Replace any covers you removed from the front and back A/C coils.
Place foil tape over any spots where it was removed from the A/C unit during the cleaning process.
Replace the large A/C cover and screw it back into place.
From the circuit breaker panel, turn power back on to the A/C units.
Turn the A/C on and let it run for about 10 minutes. Check with your hand to see if cold air is coming out of the vent. There will be a slight chemical smell when you turn on the A/C. This smell is coming from the front (inside air) A/C coil that you just cleaned. It's not toxic and will clear in a few minutes.
As a certified technician, I use the following tools to service the A/C units:
Fin combs: to straighten out the A/C fins
Multimeter: to check the compressor and capacitor
11-in-1 Screwdriver: to remove inside covers to access the electrical components
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