Upstairs bathroom - no hot water
My upstairs bathroom is getting no hot water, either to the sink or the tub. The cold water works fine in the sink, tub, and toilet. The kitchen downstairs is fine, as is the bathroom more or less directly below the upstairs one. If I run the hot water downstairs, I can get a trickle of cold water to come out of the upstairs sink turned all the way to hot. It never warms up or gets any significant pressure behind it. Everything was fine Saturday morning. I've been a little annoyed about the hot water not lasting quite as long as I'd like, but the pressure has always been good.
It was quite cold here last night (my parents' house had a frozen pipe) but I don't think that's my problem because it seems to me that the pipe I'm having a problem with would be the least likely of all the ones in the house to freeze, based on its location. I'm pretty sure it doesn't go up an outside wall, while the kitchen pipes do and they did not freeze.
Any ideas?
