Have plenty of heat from front heater core and yet nothing from rear heater core. Is there a valve somewhere between the front and rear of the vehicle? no leaks in the system ye zero heat in rear heater
There is a seperate heater core for the back of the Suburban. It is located behind the right rear interior quarter panel. You have to pull everything back there the heck apart to get to it. The blower motor is located in the same area, so if you should be having any issues with it, plan on doing them both at the same time. Also, you have to drain the whole coolant system, so if you need to do anything with the front heater core (doesn't sound like you do), plan on doing that at the same time too. Good luck!
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there is a diverter valve that lets hot water from the engine into a heater core, which is a device like a small radiator, which heats the air when it flows past. there is probably a second heater core for the rear. the valve for that one, or the switch or relay to control it is bad.
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.
Had the same problem on a 2006 pilot LX. Hot from rear heater because it comes from a separate heater core. Front heat low because ball valve faulty that controls coolant flow to heater core. The lever on the valve would move freely but the connection to the shaft of the ball valve was stripped. Ball valve may be located on the firewall under the hood. Ball valve very poor design.
Make sure you have the anti-theft codes for the audio and the navigation system, and then write down the audio presets.
Disconnect the negative cable from the battery.
From under the hood, disconnect the heater valve cable from the heater valve. Turn the heater valve arm to the fully opened position.
When the engine is cool, drain the engine coolant from the radiator.
Disconnect the inlet heater hose and the outlet heater hose from the heater core.
Remove the mounting nut from the heater unit. Take care not to damage or bend the fuel lines, the brake lines, and related parts.
Remove the dashboard.
Remove the evaporator.
Remove the mounting bolts and remove the heater unit.
Front heater unit
Remove the self-tapping screws and the clamp.
Carefully pull out the heater core so you don't bend the inlet and outlet pipes.
Front heater core
Using care, install the heater core to the heater unit and secure.
Using care, install the heater unit and tighten mounting nuts and bolts to 7 ft-lb (10 Nm).
Install the evaporator.
Install the dashboard.
Connect the inlet heater hose and the outlet heater hose to the heater core.
Connect the heater valve cable to the heater valve.
Refill the cooling system with engine coolant.
Adjust the heater valve cable.
Make sure that there is no coolant leakage.
Make sure that there is no air leakage.
Connect the negative battery cable.
Perform the power window control unit resetting procedure.
Enter the anti-theft codes for the audio and the navigation system, and then enter the audio presets.
RearTo Remove: NOTE: The rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system) and the rear power transistor (climate control system), the rear air mix control motor (climate control system) , the rear mode control motor and the rear expansion valve can be replaced without removing the rear heater-A/C unit.
Remove the self-tapping screws and the clamp, and then remove the bolts and the rear evaporator lines with the rear expansion valve. If necessary, remove the rear expansion valve. Use a second wrench to hold the other fitting on the valve so the rear evaporator lines won't twist. Leave the first fitting loosely connected so you can use it to hold the valve while you loosen the second fitting.
Remove the rear heater hoses.
If necessary, remove the rear blower motor, the rear heater core, the blower screen, the rear blower resistor (heating/air conditioning system), the rear power transistor (climate control system), the rear air mix control motor and the rear mode control motor.
Remove the self-tapping screws and the lower housing.
Remove the self-tapping screws, and carefully separate the left upper housing from the right upper housing. Remove the rear heater core.
Rear evaporator assembly
Replace the rear heater core.
Attach the heater hoses.
Make sure no air is leaking from the left upper housing and the right upper housing fitting and from the upper housings and the lower housing fitting.
Before reassembly, make sure that the rear air mix control linkage and door move smoothly without binding.
Before reassembly, make sure that the rear mode control linkage and door move smoothly without binding.
Reassemble the housing.
After reassembly, make sure the rear air mix control motor runs smoothly.
After reassembly, make sure the rear mode control motor runs smoothly.
Refill the cooling system and make sure that there is no coolant leakage.
Your vehicle only has one set of connections to the heating system, and you disconnected them when you bypassed the heater core. There is not a seperate heater core for the rear heat, just ducts off of the front heat.
I recently had a simular problem...try to follow the heater hoses that come from the engine and go into the firewall to the heater core... one of the 2 hoses connects to a plastic valve right before the firewall. This valve shuts off the flow of hot coolant into the heater core when heat is not needed.. Look carefully at this plastic valve, there is a wire pull cable with a small loop at the end that connects to a lever on the valve. Have a helper work the heat controls and make sure the cable pulls on the lever at the firewall valve...I've seen some cables disconnected. Hope this helps with your diagnosis.
There is a valve that allows heated water to flow through the heater core when you select heat on your controls. This valve should be located under the hood and one of your heater hoses should run to it. Your valve is stuck or failed for some reason. Check it out.
there is no heater control valve in this truck, heat control is done through what are called blend doors. So the issue may be the front blend door motor has failed, this is very common on all Ford heatimng systems except the Focus.