I went through this with the cadillac. There are pro's and cons to having it cleaned. Try a radiator shop.
If it were me, I'd just replace it...only like $115 for a new one.
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1953 Cadillac Coupe De Ville (Fuel Injected, Drive-by-wire, DoD)
2009 Pontiac G8 GT (6.0l V8 Sleeper)
2011 Toyota Sequoia Sport 4x4 (Tow Rig)
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