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I'm trying to figure out what's going on with my bathroom faucet. The hot water side runs hot like it should, but the cold water side no longer runs cold. It's very warm. None of the other bathrooms in my house act like this. In addition, I believe it was around the same time that the handle is now quite hard to turn. Can anyone explain how this could happen?

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Is the faucet a single handle, or separate handles for hot and cold? –  BMitch Sep 12 '13 at 18:53
    
Has anything changed? e.g. did you recently install the plumbing, and inadvertently put the hot pipe too close to the cold pipe? –  Tester101 Sep 12 '13 at 18:56
    
They are separate faucets. They have been installed for over a year and nothing has changed. It really makes no sense. Perhaps what I should do is let the water run for a really long time, but capture the water so I can give it to the plants later and not be wasteful. :) I have run it for about 30 seconds, but honestly cold water should just be cold as soon as you turn it on. –  Dave Sep 13 '13 at 1:08
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Man, it's got to be a time of day thing, which I hadn't noticed before. Maybe the pipe running to this bathroom gets hot from it being warm out in the afternoon? It's now evening and the temperature is pretty normal again. –  Dave Sep 13 '13 at 2:32
    
Do you have another single handle fixture nearby, like a shower? The mixing valve on these can fail and allow warm water to pass through the valve to the cold side. –  BMitch Sep 15 '13 at 12:45
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