You might try just pointing a small space heater at the visible part of the pipe under the sink, or if you can, cut a hole in your drywall where the pipe is and use a heat gun or blow dryer to warm it up. Turn on the faucet so you can hear when the the water starts flowing again and once you get a little flow leave it on until you get full pressure as the moving water will help thaw the rest of the pipe. If you don't have any electric heaters or blow dryers (don't use a propane heater or blow torch as it could boil the water) then soak some towels in hot water and wrap the frozen part of the pipe if you can find it. The frozen part will likely be a part of the pip that runs through an outside wall. Once you've got it unfrozen leave a small trickle running at night to help prevent refreezing, and if you can, get some better insulation, or some heat wire installed. It wouldn't be a bad idea to call a plumber and get some professional help with that, and also to check if the freezing loosened any connections or caused other problems with your pipes.
I can't find a way to tell if the pipe has burst, best to cut some dry wall and get a look at it, otherwise you probably won't know until it thaws and you've got water pouring out of it. Make sure you know where to shut off that pipe if you start to thaw it and it leaks.
Good luck!
Source(s):
http://www.thisoldchicago2flat.blogspot.com/2007/02/unfreezing-pipes.html
http://www.prepare.org/basic/frozen.htm


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