I have no cold water in my guest house shower. How can I fix so that shower and bath can be used?

Is cold water line hooked up to shower?

Do u have any water coming out of cold water valve?
What type of faucet on shower? Single handle, two valves or three valves?

Give more info and we can help.

Chuck

You are lucky 99 out of 100 here get all cold and no hot. Fix is usually the same if you are getting cold water from the bath sink. Open the mixing valve and clear the cold inlet of debris. Shutdown the main if there is not shut off at the valve.