A/c for 2004 toyota sienna le not working

The MG CLT relay controls the Magnetic Clutch for the A/C compressor. This relay is fed by fuse number 19 (A/C Comp) located in the fuse block on the lower left of the Driver's side instrument panel.

It is in the engine compartment..

you can allways look it up manuale

I go through many different steps in troubleshooting the horn on a 2004 Toyota Sienna on this webpage: John Fixes Stuff Horn Won Work How to Troubleshoot The Horn on 2004 2010...

Check the plug to the hor, then the fuse/relay, then the steering wheel switch.

I have a 2013 toyota yaris le bought a oe universal horn apparently the horn wasnt getting good ground so i bought a wire added it to the battery and the horn went off i was happy until i realized it wouldn't stop. Wherr is the relay to make it only work when touched. Help

If you have actually checked low pressure side for proper pressure and it is correct, then the low pressure cutoff switch may be defective.

It is the Magmetic clutch relay for your A/C - if your AC light is blinking and you have no AC change this relay - common problem in this model - to test the relay switch it with one of the other relays next to it and try the AC (the relays are ina black box on the drivers side under the hood behind the battery)

I don't know of any relay that would take that long to replace.
A very common problem is the magnetic clutch relay which works the A/C clutch. Its located under the hood in a relay/fuse box right next to the battery. Take the cover off and look inside the cover. It list all the relays and fuses in it. Locate the one for the mag clutch. It will be abbreviated like mg/ch or something similar With the car off, pry it out carefully and swap it with the horn relay. (look for that one listed in the cover also) After the swap, start the car and see if it works. If it does swap them back to their normal positions and go buy a new mag clutch relay.
Hope its this simple for you.

could very well be the relay for the power door and possibly the interior light relay... they are located in the fuse panel under the dash.

Robert