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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
I had the same problem. I used garden hose and sprayed it in the back of the fan motor while turning the fan blades. Then just hosed the the rad real good