How can I clean my front loader washer without using hot water?

On the front loaders the smell could be coming from the door itself, check by the rubber on the swing door, that may need a good cleaning, if you can leave the door open so it can dry out thoroughly.

They also have something on the market that keeps front loaders from smelling can't remember what it's called tho.

put bleach and warm water if you can and detergent and run it.