Two sinks at my house have hot water but no cold

Your cold water is frozen somewhere

Any concern for when it melts of it busting?

Should I leave cold water lines open, closed?

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Any concern for when it melts of it busting?

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It's the freezing of the water that causes the pipes to burst. The thawing just reveals where the damage is.

Are the sinks on the exterior wall? The lines could be frozen behind the sink, not uncommon.

Your cold water line is frozen. Leave open and when thaws at least water will go out your faucet into you sink.. otherwise if you broke a pipe it will go there .. do the sinks back up to an outside house wall.. if they do probably froze there ..

I have a kitchen sink and wet bar where they both back up to outside wall.. I keep the cabinet doors below open and them dripping… I have a faucet in kitchen where you have one handle to operate the water.. you side front or back depending if temp.. it is a pain to keep dripping because you have to play with it to make sure both hot and cold dripping.. few years back I thought I had it set but the hot must not had been dripping enough …it froze.. fortunately no bust and when dub hit the wall it thawed.. I usually make a point of getting up in night a making sure I run both hot and cold for a few minutes.

I hate outside wall pipes.

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Are the sinks on the exterior wall? The lines could be frozen behind the sink, not uncommon.

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Yes they are on an exterior brick wall. Any suggestions other than to just wait for it to thaw it.

TIA guys!

If I were you I’d shut off the water to the house at the main ASAP if you have copper lines. Obviously cold water lines in at least one place have frozen and might have burst. If you don’t turn off the main, once the ice in the line melts you will flood your house.

If you have pex, just let it melt bc pex usually won’t burst.

PVC or pex?

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Any suggestions other than to just wait for it to thaw it.

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if you have a space heater or something, put it inside the cabinet