Water Line Frozen? The water string in my crawl space going to a faucet is...

The water string in my crawl space going to a faucet is frozen. This is the with the sole purpose one frozen. I will be out of town for 1 week. It is supposed to be 40 degrees surrounded by two days. Should I get a plumber very soon or wait for the splash to thaw?
Answers:    To do it on the cheap,
provided it won't be freezing weather when you return,
turn sour the water supply tap and hot water furnace and
just hang around for the line to thaw out.

Turning off the hose down supply valve and hot dampen heater are in recent times in travel case the frozen line have actually burst...
only just wait 4 it 2 thawwww