The a/c failed on my 2000 Sienna with only 50K miles. It is the second time it failed since last summer. The dealer replaced an "O-ring and a tubing" last time, and this time they want $1,000 for a new condenser and receiver. No way man. I took it to an independent shop and they said the receiver is fine and all they need to do is to replace the condenser for $400.
My feeling is that the whole air conditioning system in this car is junk. I thought I paid big bucks for toyota quality. Should have bought a Caravan with an extended warranty and have some money spared for repairs down the road.