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Start furthest from master cylinder. Passenger rear, driver rear, passenger front, driver front. These Montana vans have an abs system that can only be cycled by a computer. I had to take to a dealer to get them to bleed the system. Cost about $100 dollars. If you didn't remove any lines from master cylinder you should be okay w/out.
If you have heat in the front the engine cooling system is operating normally (waterpump ok) If the rear hoses were rusted out you would have front issues too due to collant loss. I sounds like either the rear controller has a problem with the temperature door actuator or an electrical problem going to the actuator. They sometimes have a heater valve which shuts off coolant flow to the rear heater core. It is located in the engine, where the rear hoses split to the rear. They are usually vacuum operated, possibly the valve or vacuum issue, check there. Feel the rear hoses under the van with the rear heat on. One should be hot and the other warm (this would indicate the heater core and valve are functioning). If the rear fan works the fuse is ok for the controller.
Did you replace the expansion valve?
Also try adding just a little more freon and see if that makes a difference....is there a sight glass you can view with the system activated to be sure you have it completely air free?
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