I detected a leak at the rear ac expansion valve and wanted to ask around about what replacement part to get.

Local dealer price: $120.00 for rear expansion valve
local parts store: $25.00 Four Seasons - 39330 - Block Type O-Ring Expansion Valve

It's my understanding that this expansion valve has failed considerably on many Caravans due to two dissimiliar metals. Because the dealer is charging 120 bucks is this a better valve vs. the $25 dollar Four Seasons valve?

My next question is can I replace this valve from the underside of the vehicle without removing the AC unit first?

Any help is much appreciated.

Thanks

 

could just mean that the valve is aftermarket. sometimes they built better sometimes not. to me if I was removal of the refrigerant and all the work I put in oem when possible.

 

I would not install any A/C component with Four Season logo on it. Had bad experience with them, and heard a lot stories about them from other mechanics.


Some Caravan has an 3" extension pipe coming off the rear H-Valve, that pipe may get stuck to a point where you may have to destroy it to get it off.


Make sure you buy 4 O-rings as well, the H-Valve may not come with it. And you can change the H-Valve from the bottom. but wear a clear mask or at least safety glasses, a lot of nasty stuff will drop on your face.


And if possible, you should make sure the H-Valve will even separate from the Evaporator before you buy the part. You do not want to stuck with an extra H-Valve when you also need a evaporator.