#Plumber #Plumbing LEEDS PLUMBER repairing a leaking radiator. HOW TO REPAIR A LEAKING RADIATOR. If you have a leak from the radiator then this video will show you how to fix leaking radiator. Leaking radiator valve and also a leaking radiator. Turn off the lockshield valve, Also turn off the TRV valve. Repair a leaking radiator without having to drain the full heating system down.