Hello Art I do have a separate cold water valve under the sink. It is connected upwards to the faucet with a narrow stiff pipe. A friend of mine told me to undo the nut next to the valve and disconnect the pipe, but being a stiff pipe, I’ve been unable to do that. I suspect the problem isn’t the faucet since there is literally no cold water coming into that bathroom–either via the cold water faucet, into the washing machine or to fill the toilet bowl.
Thank you!