Pipes froze last week. Used heaters to slowly thaw. Outside temps the rose into 50's for two days, so there was no ice remaining in pipes. All faucets now work again, except two (that did work before). Those are cold water taps in second and third floor sinks. Warm water taps work there, just not the cold. Toilets, showers, sinks everywhere else work fine. Just those two cold taps remain non-operative. Not even a trickle. What has happened? PA Home, 50 years old, never a previous problem.

Let's do some checking. Turn off the cold water angle stop and then remove the supply line. Now open the angle stop a little and see if you have water. Let me know what you find. Back to you, Tom