Was dead set against ultrasonic cleaners for fridge coils, now I use one every week

Ngl, I thought ultrasonic cleaners were just gimmicks for jewelry or dental stuff, not for appliance repair. Last year a buddy in Phoenix swore by his for cleaning condenser coils on walk-in coolers. I laughed it off until I borrowed his unit for a nasty buildup on a 10-year-old True fridge that was tripping the compressor. After 15 minutes of ultrasonic action, the coils looked brand new and the fridge ran 4 degrees colder. I went and bought a $150 one online that same week and it's saved me at least 3 callbacks since then. Has anyone else had good luck with these for evaporator coils or am I just lucky?

4 comments

4 Comments

michael_green441mo ago

That "clean enough to eat off" line hits home, my compressor stopped short cycling after the first ultrasonic go.

logan6581mo ago

My buddy in Tucson runs a small repair shop and he's been using one on evaporator coils for like a year now. He told me last month he pulled a frozen coil from a reach-in that was totally caked with dust and grease, hit it with the ultrasonic for 20 minutes, and it came out clean enough to eat off of. Saved him from having to order a new coil and wait two weeks for delivery. He says he'd never go back to just brushing them off now. Have you tried it on anything besides fridge coils yet?

margaretramirez1mo ago

Yeah but 20 minutes might be overkill for some coils. A thin aluminum evaporator can start pitting if you leave it in too long, especially with a harsh solution. I usually do 10 minutes max, then rinse with distilled water. And yeah, I've done AC blower wheels and furnace burners too. The burner tubes on a gas furnace come out spotless, no more carbon buildup. Just make sure the solution isn't too strong or it'll eat the coating off the aluminum.

the_rowan1mo ago

Running a thin aluminum coil through a ultrasonic for 20 minutes sounds like tempting fate to me. Even if it comes out clean, that's a lot of vibration and heat hitting something that's already fragile after years of use. I'd rather spend the extra time with a soft brush and compressed air than risk turning a coil into a sieve.