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Genchi Genbutsu
Genchi Genbutsu, Toyota Master Technician
Category: Toyota
Satisfied Customers: 4395
Experience:  Toyota Certified Master Diagnostic Technician, ASE Master Technician with L1 Advanced Engine
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2004 4runner SR5: drivers side..temp control..passenger side..warmer

Resolved Question:

2004 4runner SR5 heat only drivers side. Operate temp control up and down passenger side gets warmer. Single contol for heat not dual control.
Submitted: 5 years ago.
Category: Toyota
Expert:  Genchi Genbutsu replied 5 years ago.

Thank you for using Just Answer for your needs. Does the air conditioning cool equally on both passengers and drivers side?




Customer: replied 5 years ago.
Air conditioning works well on both sides equally as well as the back seat vents. Fan works equally also. All fuctions on the controls work also, dash/dash/floor/defrost etc
Expert:  Genchi Genbutsu replied 5 years ago.

So the only concern is that the heat does not work equally on both sides, correct?




Customer: replied 5 years ago.
Correct, 130 degrees heat on drivers side and 50 degrees on passenger and back seats.
Expert:  Genchi Genbutsu replied 5 years ago.

This is definitely an odd concern. The problem does not sound at all like the heater core. When the Dealership checked it out did they check and watch the blend door and air select servos for movement?




Customer: replied 5 years ago.
the dealer said they connected to their computer and found nothing wrong with the servo motors and the blend doors. Could it be the servos move but the internal linkage is hanging up in some manner. Also when in defrost mode only half the windshield gets hot air.
Expert:  Genchi Genbutsu replied 5 years ago.

Yes, that is what I am thinking. Them hooking the Techstream scantool up is not a great way to tell if the system is operating properly as the data and diagnostics is extremely limited. It's not like the engine computer diagnostics.


What they should have done is taken the lower dash panel out and disconnected the servos, then manually adjusted them to see if the operation changes. Most likely one or move on the doors is not operating fully or is stuck due to an internal air box fault.




Customer: replied 5 years ago.
Asuuming the likage or whatever is not operating correctly, what is the solution? replace the whole servo assemby?
Expert:  Genchi Genbutsu replied 5 years ago.

If it is the servo then yes. If it is found to be the internal linkage then the box itself will have to be replaced or at least opened and checked to see if it can be fixed. If the box itself needs replacing then it will be expensive but just the servo will run only about $150.




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