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You have a cross connection somewhere in the plumbing. Turn on the cold water in all the faucets that are running hot out the cold. Check the hot to the rest of the house. If it is fine, a cartridge in one of the faucets has failed.
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Give me a little history about the house and plumbing. How old is the house? Have you lived there since it was new? Do you have a circulator pump?
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The house was built in 1979. I've lived here since 1990. The hot water heater was replaced about 3 years ago and seems to be working fine. As I mentioned earlier, the hot water is perfect in the rest of the house.
I've never seen this particular problem before. The only other strange problem I've seen with this bathroom is during the winter. Four or five times I've seen the cold water run really slow, just a dribble. But running the hot water for a few minutes has cleared it up. I've always just attributed this to the cold water line freezing up a bit, the lines being buried close together, and running the hot water simply thaws it out (I've never seen the hot water side freeze up, and I can't explain why not...seems to me they would both freeze up if it got cold enough to freeze up at all). The weather here lately has been in the 70s and above.
There is no circulator pump.