With 75K, the ac would kick on and off. Taking it to the dealer, they replaced the compressor relay. A week later it wasn't working again. Now they want to replace the Same relay and the orifuis tube for the tune of $1200.00.
There used to be a collector that traped any stuff in the system GM took this out of the system it may be around that year if it is not there then the dirt is gone to the compressor which now may be shot.the reason for the price ,maybe.
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I would suspect the AC compressor cycling switch (located in low pressure line from compressor) or a AC cutoff wide open throttle relay ( in under hood fuse and relay center) would be causing this problem.
It could be that there was more than one leak and the dealer found only one. The AC system has two pressure switches to protect the compressor from damage---a low press. switch cuts off the compressor when there is not enough refrigerant in the system, the high switch cuts off when pressures get so high they could blow out the seals. Both are a result of a leak--refrigerant leaks out and air can leak in. Air will compress and when it does, it gets hot--so no cooling, and pressures go way up. So the compressor may have been stopped by those protective switches.
Of course, there could be a bad relay or other circuit malfunction.
Another possibility is that the compressor sat too long before being repaired (but we are talking about weeks going by here, not days). The air and moisture (humidity) that leaks into the system during this time creates acids that will attack the metal reed valves in the compressor. On restart, the damaged metal valves eat themselves in short order. If this is the case, the compressor ran until it seized and will need to be replaced. This particular problem is impossible to diagnose. So the dealer may have done his best.
WELL TURN ON AC MAX COLD HIGH TO SEE IF COOLANT FANS TURN ON.IF NOT YOUR REFRIGERANT SO LOW THAT THE AC REFRIGERANT PRESSURE SENSOR WONT CLOSE CIRCUIT TO TURN ON COOLING FANS.MEANING YOU NEED HAVE AC CHECKED AND CHARGED.ALSO CHECK COMPRESSOR FOR POWER IF NOT YOU HAVE BLOWED FUSE OR BAD RELAY.IF FUSE AND RELAY GOOD YOUR AC COMPRESSOR CLUTCH COIL OPEN OR THE AC CONTROL SWITCH IS BAD.IF COMPRESSOR IS RUNNING WHEN YOU TURN ON AC YOUR AIR TEMPERATURE ACTUATOR NOT WORKING.
With engine running, I would check to see if the compressor clutch is engaging when the AC is turned on. If not, I would first have the freon level checked. If after checking, it is fully charged but not engaging, I would then suspect an AC relay switch.
I hope this helps... Good luck!
The problem is most likely the AC compressor clutch connector.
It is a one pin connector. Located under the hood, near the clutch of the AC compressor. Clean this connector, make sure there is a good connection. I had the same problem and had to fix it myself. Works fine ever since.
Your rear AC lines may have rusted and let the gas escape. This is apparently a common problem in salt road areas for the sienna. They separated the front and rear AC lines on the 04 and later models but the rear lines are still exposed is my understanding from a Toyota mechanic. Norman783
The blower motor resister is located next to the fan under the passenger side dash. You will have to remove the glove box and plastic cover under the dash to expose the blower motor. the resister is next to the blower motor.
It's the relay in the front fuse box area of the engine compartment. Toyota has a replacement for it. The dealer will charge you $200 to fix. The rerlay can be found for much less than $70. You can pull the old one and replace it in about 45 seconds with a set of pliers