My two kitchen sinks are clogged. I have a garbage disposal and a dishwasher. When I turn on the garbage disposal all the water in that sink goes into the other sink. When I turn in off the water in the other sink flows back into the garbage disposal sink.

Your drain is clogged. You will need to snake it. You just want to find out whether it is clogged in drains under your sink or down the line. Remove the P-trap, see if there is any clog. If not, rent a 1/4" or 3/8" snake and insert it as far into your kitchen drain as possible. Flush with lots of water. Reinstall drain assembly and P-trap.

I agree with Milo, Place a bucket under the P traps and Remove both P traps under the sinks see if there is something inside, if something is cloged clean and install the traps, if not cloged do as Milo says, good Luck.

Regarrds,
John

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Originally Posted by Peeweenovak

My two kitchen sinks are clogged. I have a garbage disposal and a dishwasher. When I turn on the garbage disposal all the water in that sink goes into the other sink. When I turn in off the water in the other sink flows back into the garbage disposal sink.

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You have a blockage in the horizontal line inside the wall. Follow Moilo and Johns advice about removing the "J" bend of the trap and send the snake up,the trap tail, (see image). You will hit a bend about 8 " in the wall but once past that you will only have to put out 6 more feet of cable. Good luck, Tom