Anyone know how difficult it is to change the air conditioning condenser on a 2005 4.2. Any particular snags or tricky bits?

 

It's not very difficult. You can do it by removing the lower splash shield and the grille. There's 2 nuts securing the condenser, and 2 slots that keep it attached to the radiator. I believe the p/s cooler shares the same studs as the condenser, it can just hang while the latter is changed.

Of course usual caveats about discharging the refrigerant first. You'll also need the 2 orings for the condenser inlet and outlet. They are not standard sizes I had in my a/c oring assortments, I ended up ordering from the dealer.

Another small gotcha, the Behr condenser I ordered should have been OEM, but arrived as unpainted aluminum. Giving that a quick flat black spray caused unexpected delays.