Does your Routan have the multi zone control. The back temperature can be controlled separately from the front. Look at the console on the roof between the front and middle row seats. There is a mixture control there that will control the temperature for the back.
SOURCE: my heater in my volkswagen bug blows but do not
If you car is coming to temperture but you still have no heat then you probably need a new flow control valve for the heating system.
Make sure your cooling system is filled to recommended level before you consider the heater control valve. Low coolant levels can have similar effects.
Good luck and be safe!
SOURCE: v reg volkswagen passat, heater blows cold air.
As it was rusty i would assume the poor thermostat has been abused, it's in the waterpump and a few minutes to change.They are £6+ from main dealer.If in the open position(wax has no life left to open or close and spring keeps it open) this is why all seems fine but no heat.With the thermostat in the open position(faulty) your car will use more fuel and wear and tear on the engine particulary at cold starts will increase so change it sooner rather than later.
SOURCE: 1999 volkswagen beetle ... a/c won't blow cold
check freon if it is full charge ,check auxiliary fan , if this two condition is good ,you need to replace expansion valve and filter drier
SOURCE: my 2001 volkswagen beetle air is not blowing cool
you can purchase a recharging kit and hook it up and see what the gauges tell you,
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