I recently replaced the throttle position sensor. Of course it was freezing cold outside as I did this work. In the process of replacing that sensor I must have lightly touched one of my coolant lines. I might have just looked at it wrong, I am not sure. In any event the plastic quick connect coupling cracked. I didn't realize it at the time but by the time I got to work the next day I could see the coolant leaking down from the engine compartment. Thankfully it was a very small hole but it was till making a big mess. 

That same ride to work also saw the end of my serpentine belt which took out my transmission oil pressure sensor wires on its way out. I had a full schedule of repairs after that one drive.

It turns out that the quick connect coupling from Ford may be a quick connect but it is impossible to disconnect. I ended up cutting the old connector off. The replacement quick connector fitting I got was garbage. It didn't include any o-rings and it would never have sealed anything. I ended up returning it and just putting the hose over the pipe and putting a hose clamp on it. No leaks 300 miles later.

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Smll Med Lrg one of my coolant quick connect fittings got cracked and was leaking	Smll Med Lrg had to cut off the old fitting. It is not a "quick disconnect" fitting	Smll Med Lrg pipe visible that the new fitting should attach to	Smll Med Lrg
Smll Med Lrg new quick connect fitting was garbage, no sealing o-rings. It would have leaked	Smll Med Lrg ended up putting hose directly on pipe and double clamping it	Smll Med Lrg hose slid up over the old stop ring so I know this hose will not come off	Smll Med Lrg new serpentine belt
Smll Med Lrg old belt frayed and lost about 25% of the belt width	Smll Med Lrg	Smll Med Lrg when belt frayed, it took out the transmission oil pressur sensor wire leads	Smll Med Lrg wires soldered back together
Smll Med Lrg wrapped the wire in fuel injection hose to provide additional abrasion resistence