Hello I will help you with your question,
This is a flow restricter and keeps the heater core quiet and slows the coolant flow to reduce the erosion from the coolant through the core.
Let me know what further questions you have about this
There are no flow diagrams produced for the service industry and I have to work from experience here. I know if the restricter is not installed the core will fail in a few weeks time from the increased flow.
The heat sounds good but how is the cooling? If there is no flow through the AC evaporator you will not have defrost/defog function so that needs to be checked.
Is this a full automatic system? If so has the calibration and operation test been run?
Let me know what I can do to help
The only failures of the restricter that I am aware of is that it will become brittle and shatter. The restricter is before the heater core to slow the coolant coming in so I wonder if you have it in the wrong hose? The OEM hoses are molded to only fit one way. The coolant will be about 200 degrees so if you have 150 air out of the center vent with the fan on medium that is normal. This will burn you if you keep it on this setting for long but you have a lot of area to heat so you can turn the blower up to get the cabin warm quickly then moderate the temperature from the vents by adjusting the blend door.
The automatic system has an infra red temp sensor to set the output temp so I come back to my original question, has the system been calibrated? Is this a full auto system?
You may find this diagram useful (Click here) If you have an engine oil cooler the diagram will be different as it will be if you have a rear heat unit.
By the way the problem with the impeller is well documented
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The arrow should point to the heater core when the restricter is placed in the engine to heater inlet line. I don't know the engineering behind the design but it does work and if you leave it out you will be replacing the heater core in a few weeks.
If you have the manual system with rear heat use the diagram below
Note that the engine outlet runs to the lower heater inlet pipe.
Try this procedure to calibrate your system.
Let me know what I can do to help you with this
OK please let me know if there is anything I can do to help
Thanks for using JA!!