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Cleaning the exterior of an evaporator

Old Codger on Tue September 09, 2008 10:34 PM User is offline

Year: 1995
Make: Toyota
Model: Camry
Engine Size: 4 Cyl
Refrigerant Type: 134a
Ambient Temp: 90

I have pulled the evaporator out of my 95 Camry to more thoroughly flush it. The exterior was dirty. I blew it off and would like to clean it off with some water and soap. However the Toyota Shop Manual says:'

If the fins are clogged, clean them with compressed
NOTICE: Never use water to clean the evaporator.

It seems pretty clear that they don't want me to use water and soap. Anybody have an idea why not?

I would think that it gets plenty wet when operating and I would plug the coolant in & out tubes so no water gets in. I have tried to blow it out but it still looks kind of yucky (sorry about the technological terminology).


TRB on Wed September 10, 2008 10:49 AM User is offlineView users profile

Water on the outside of the core is not going to harm it. Cap it off and use a industrial cleaner on the fins a outside core.


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NickD on Wed September 10, 2008 11:49 AM User is offline

NOTICE: Never use water to clean the evaporator

Ha, maybe in Japan, in the USA, the EPA frowns upon any type of solvents for cleaning today, has to be biodegradable meaning water based cleansers. The trick is to flush it out, (with water) and dry it thoroughly, that can be done by putting it in your wife's oven, it's yours too, and letting it bake at around 190*F for 45 minutes.

Never use any acid with aluminum, but sure works great on copper or brass, ha, have been known to use my dishwasher for a great cleaning, but good to rinse off the dirt, can mess up your dishwasher.

In regards to the outside of the evaporator, they have been known to get very wet, dripping wet.

Old Codger on Thu September 11, 2008 12:24 PM User is offline

Makes sense to me. Thanks for the moral support.

PS-no wife-I do own the oven!!!!!! (maniacal laugh in background.)


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