I have a 2000 Ex with the V-10, which has about 85,000 on the clock. Yesterday while our temperatures here were up in the 70's I thought i'd hit the AC for a bit after a while 20-30 minutes I began to smell anti freeze so i pull over an check out my ride, well there is a puddle of anti freeze after i shut it down, and i cant see where the leak is coming from. I tried to search for AC and over heating but didn't come up with anything. Anyone have any ideas? I have driven it around today with no leaks at all, seems to leak only when the AC is on.

 

The compressor does take a few horses to spin, but most likely it would have something to do with the condenser in front of the rad blowing hot air into the rad. 70 isn't really hot, it's the beginning of jacket weather for me.

Because your smelling inside, I'd suspect the heater core. If you were on max, it should isolate the cab from the engine bay.

Because your truck is 8-9 years old, if you haven't replaced the coolant cap, it's probably due.