I have a 2011 dodge journey, the climate control has been working well up until today. When you remote start start it does not heat up. When in motion it starts to heat but not enough to notice. When you come to a stop it gets to blowing cold air. What's up with this lemon?

it could be low coolant level or a broken /stuck open thermostat or even a plugged heater core or plugged radiator ...A bad thermostat will never let the engine reach operating temp causing the system not to pressurize helping it to transfer heat ....the same would be for a plugged radiator not letting the coolant circulate and keep the heat in the engine leaving the thermostat open ....also check for the radiator fan staying on cooling the engine before it reaches operating temp

The problem was a hole in the overflow reservoir. I had that fixed & the system flushed, and it did well until last night & now it & now it only blows cold air.