I'm getting ready to flush the coolant on my explorer. To my knowledge it still has the original coolant from the factory. I noticed that it is the yellow/orange type coolant. I did not know that ford used dex coolant in their cars? When I told the guys at O'riley's they did not believe me that my 3 gen ex has the yellow type coolant in it. To confuse me even more, the resevor cap appears to have a warning to not pour yellow type coolant into the system. What type coolant did the 3gen explorers come with from the factory, green or yellow? Thanks.