Thank you all for your responses. So, I have finally been able to get around to driving the Explorer after having it looked over by the mechanic. They replaced the fuel filter, changed the coolant and thermostat as well as all fluids. Everything else was in good shape according to them. I had to run it thru emissions out here when I purchased it a few weeks ago and it passed however, the gas cap failed the pressure test and they gave me a new one at the emissions testing center. Then all of the sudden yesterday, I smelled a bit of a fuel vapor smell when I was reversing into my parking space and when I went out to run my next errand my check engine light came on. I checked the code at my auto zone and it is giving a catalytic converter P0420 code bank 1 which seems very odd to me with only 98K miles on it. I am hoping (really hoping) that it isn't a cat issue. I went to ford and got a replacement gas cap instead of the emissions testing replacement one they gave me to see if that sealed better as well (even though I was not getting and evap code). Has anyone else experienced anything like this with their rig?
Also, I am out here in AZ and it is quite hot, I noticed today while driving that typically the temp gauge is right under halfway but at some points today it happened to move up slightly to just a tad above half (within the ranges of just before and just after the little thermostat symbol) it did not go above that. I am just always used of temp gauges typically not fluctuating. Has anyone else experienced that?