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This is common you will need to check the front blower resistor, this is located under the dash on the passenger side on heater box next to blower motor. the wiring plug also needs to be looked at. the plug on some of these heats up and starts to burn and in turn the connector needs replacing and the resistor also. If the connector is good then replace the resistor and that will solve the blower problem.As far as the rear unit not blowing hot air , make sure the coolant is full and if the coolant if full then you will need to take a look at the rear unit blend door. this is the door that opens and closes to control hot or cold air, if the coolant if full in radiator then blend motor may be bad, testing will need to be done to see if its the door or the motor that controls the door. good day
If your not getting any heat out of the vents and the blower motor is working than the first thing to do is check the coolant level. If it is low the first thing to stop working is the heat.
If its full than make sure the engine is coming up to temp. The temp gauge should read around 200 degrees F. when the engine is up to full operating temp.
If the those two are o.k. that make sure you hear a difference in air flow out of the vent when you switch the heat selector from full cold to full hot. If you hear no difference than you may have a blend door or blend door actuator problem.
If all that checks out than the last thing may be a plugged heater core. Especially if the coolant is muddy looking (really common with fords). Back flushing the heater core may help or cure the problem.
3 possibilties(1) Bad secondary water pump motor.Its located on left side inner fender by firewall under hood.The pump looking thing with 2 heater hoses and 1 cable connection (2) heater valve near secondary pump, 4 hoses 1 electrical connection.Power on to shut water off to heater. (3) blocked heater core.
2 problems? No blower motor: Blower motor resistor very common or motor itself or heater controls. No heat: Start simple with check antifreeze level after vehicle has sat for a few hours. If that's OK then it could be thermostat, heater controls, blend doors, water pump, restriction in cooling system
There is an Electic Water Pump for the Heater that is located under the hood near the left fenderwell. If it's not a fuse, then likely, this pump is bad. Mine went bad in my 1999 Jaguar XJR. It runs close to $400 for the pump, so hopefully that's not the problem. Price does not include labor.
Since I'm comfortable with Electronics, I replaced the brushes in my motor and it works fine now. Heat all the time and only cost $1.00 You may be able to find a shop to rebuild the motor for you at a fraction of the cost.