I have a 2009 Toyota Prius, it's a salvage title I imported from the US, had some coolant pathway problems including the heater radiator, I changed it after a leakage problem and things went well from right then.
A year later, the air coming from the dash is split, the passenger half comes warm air, and driver's side comes cold.
I sent it to a mechanic and he applied jet water "pressure" into the intake hose of the radiator so it might work "unclogs", but still same problem.
No leaks, coolant level is good, but I noticed when turning the heater on, sound of running water in the dash...
Thanks in advance.