We had a little warm spell the other day and I took the Sienna to have the front end lined up. I carried my wife to pick it up and she left before I did so I deceided to text her and see how the van was driving. She told me fine, but the A/C wouldn't work. Today I finally had time to check it out. I looked all over and never could find the low pressure switch. The high pressure switch was right next to the hook up. I wasn't getting any power to the A/C clutch, so I jumped it to make it come on and hooked gauges to it. It blew cold air and gauges showed system was charged. I also checked all fuses that the owners manual said pertained to the A/C. None were blown. After finally giving up on it on the way home from my shop, I am sure it came on for a little while and blew snowballs. I turned it off and figured I would have another look at it when I got home. I could never maake it come on again. I hope someone can help me out with this, summer is just around the corner.
Kebo
I believe there is only 1 relay for the clutch. It is in the relay block under the hood by the battery. It is marked 'MC' MG CLT. Try and swap it out with a known good relay. The horn relay will work. It is not used much so it should be a good test relay. The colour of the relays maybe different but will work.
Let us know how it goes.
Edit by robo5 : corrected relay name.
Let us know how it goes.
Edit by robo5 : corrected relay name.
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