Crazy Question - Cleaning A/C Coils - W124
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Joined: Aug 2018
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1990 300 SE
Crazy Question - Cleaning A/C Coils - W124
Ok, I know I will sound like a lunatic. I have terrible allergies, and some contamination in the A/C Heater Box. You know the score. I have tried running Ozone trough the system, and that did help. Tried every spray can and foam - for years - with no real improvement. Even tried the $100 Liqui-Moly Compressor-based system...long tube with tiny spray nozzle, shoots disinfectant through all the ducts. Great idea, but still won't get deep into the tiny A/C coils. There is currently NO complete solution to the problem So I don't use the A/C or heater.
My (possibly 'hare-brained') idea...Since the heater box is "water-proof" - to "some" degree - 'sealed', with a drain (at bottom)....my idea was: Fill the entire box with 1-2 gallons of cheap Hydrogen Peroxide...fill it up over the top of the coils. Peroxide will kill (oxydize) every organic molecule in there (mold, etc). I've used it for years to wipe out allergens, fogged it even. ... Let the box drain out... then run the heater for 30 mins. It's shouldn't corrode or rust anything as long as it's drained and dried fairly quickly. Question is: "Would it mess up any other part of the A/C mechanically?" It's just a sealed, waterproof box with a coil and coolant pipes, right?
Any help would be appreciated. Summer is coming!!
My (possibly 'hare-brained') idea...Since the heater box is "water-proof" - to "some" degree - 'sealed', with a drain (at bottom)....my idea was: Fill the entire box with 1-2 gallons of cheap Hydrogen Peroxide...fill it up over the top of the coils. Peroxide will kill (oxydize) every organic molecule in there (mold, etc). I've used it for years to wipe out allergens, fogged it even. ... Let the box drain out... then run the heater for 30 mins. It's shouldn't corrode or rust anything as long as it's drained and dried fairly quickly. Question is: "Would it mess up any other part of the A/C mechanically?" It's just a sealed, waterproof box with a coil and coolant pipes, right?
Any help would be appreciated. Summer is coming!!
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Joined: Jul 2012
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From: Orbiting the planet
This place is a joke.
On to the main question, you cannot fill the evaporator with fluid, it will run out of the vent openings and gaps in the case before the liquid level gets high enough to cover the entire core.
There is a professional tool that Mercedes dealers have which is a pressurized container with a long metal wand that slides into the hole where the evap temp sensor is located, and sprays disinfectant directly on the evap coil. However this was designed for newer MB cars so I'm not sure it would work. The cleaning solution is called contra-sept....not sure if I spelled that correctly. The final option is to remove the core and clean it manually
Expect about 24 hours of labor and lots of broken pieces that are no longer available from MB. This will also cost more than the car is worth.
Last edited by E55Greasemonkey; May 9, 2020 at 10:05 AM.
