Bathroom sink issue

[03mustangdude]

Hot side shoots out cold water that never gets hot

Cold side is just a small stream of cold water.

Any ideas how i can fix it started about a week ago.

[scootro]

do you have hard water? is it a new hot water heater?

[03mustangdude]

have hot water on cold side. it is not a new heater.

[scootro]

A few things I can think of
1. So it runs cold, then hot, then cold and stays cold? I take it you have a re-circulating line? If so and the lines are close to each other and uninsulated it's entirely possible to have the hot line heat the cold while the water is sitting. Their isn't anything you can really do about it besides insulate the pipes, get them further away from each other, or remove the re-circulating loop.
2. Did you replace any plumbing? It's possible you crossed a hot and cold line somewhere.
3. For some reason prior to you owning the house the hot and cold lines may have been tied together with a ball valve, perhaps an attempt at a home made mixing valve of sorts. Stuffing insulation may have knocked the handle on the valve open.