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do you know what code or codes set when engine light comes on?
if vehicle has automatic temp control, it is probably the blower controller. it is located in the evaporator housing below heater hoses straight back from rear of right valve cover.
working on 2007 explorer sport trac with 4.6 right now. has 98k miles on it. has #2 misfire on it. needs #2 coil and plugs. if you have 100k or more miles and have not changed plugs, its time for tuneup. take it to a shop that deals with doing these as the plugs break when taking out. there is a tool to remove the broken plugs without any problem. takes about 30 minutes to remove each broken plug.
drain is located at bottom of firewall below heater hoses going through firewall. will cause water to drain into floor board if it is stopped up.
no recalls for heads or head gaskets for this engine.
these were bad to burn wires at the blower resistor. probably needs resistor and wires to resistor replaced. it is located below the glove box in the heater housing.
check owner manual as this system can be turned off. if it is on, may have a bad sensor in rear bumper.
this vehicle has a coolant tank mounted on right fender by radiator. this is where coolant is added. they are bad about cracking near bottom of tank. sounds like that is where leak is.
if speed sensor is bad, it tells computer what speed your going and when to shift transmission. may not set engine light but should show code for speed sensor fault.
low side port located in a/c line running beside right strut tower. high side located below battery.