It will surge at slow speeds while going forward or reverse. Now at 41,000 miles the radiator has sprung a leak. The dealer says this is the first they have heard of explorers having radiator problems. A fun thing to do is when you see someone with a 2006 explorer ask them if they have replaced the radiator yet. You get a surprised look and an answer like "how did you know?"
Ford needs to own up to the bad radiators and stand behind the product.
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