If your radiator is located in the back instead on the side, the slobber tube as mentioned above may be depositing oil on the lower part of the radiator. I had this problem on an Alfa, and pressure washing did not clean the radiator. I had to clean with steam. If all of this is true, you need to reroute the tube to the side of the coach.
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2001 Newell #579
tow a 2011 Honda Odyssey
1935 Mercedes 500K replica
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