Dometic rm4223 has leaked coolant. The

You need a new cooling unit. That ammonia smell means that your heating unit is shot, needs to be replaced, and there are a coupla ways to go here.

1) Order up a rebuilt (or new) online, and replace it yourself. (Handyman skill level:fair.) $500.

2) Go to an RV repair shop and have that done $700.00 - $100.00

3) Buy a new fridge. $1000.00 ++