Question about Toyota Sienna
Knob won't turn controller.
Posted by Anonymous on
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Posted on Jan 02, 2017
I had that, got a new unit from incurance company scrapyard for $80, changin it was $20 and when opening the old one (the knob is a potentiometer) there was just excess oil between contact surfaces... Local M dealer gave me an estimate of $1500+job
Posted on Apr 21, 2009
You have one of two possible problems.
1) The temperature shaft retention nut is loose behind the knob
2.) The wires to the potentiometer part of the temperature may be broken.
Either one is common to this vehicle. The replacement of the AC controller is about 900 dollars. If the wires are broken, they can easily be reattached to the circuit board via soldering. What you would have to do is remove the control box from the dash, and disassemble it. Once the unit is apart, there are 3 wires from the temp knob to the circuit board that need to be re-soldered. The unit CAN be repaired, as opposed to the expense of replacing it.
Posted on Apr 23, 2009
SOURCE: tempature control knob
There's a white lever under the dash near the steering wheel. You can change from heat to cold with that instead of the knob! If you look under there you'll see it and just push it up for heat pull towards yourself for cold.
Posted on Dec 25, 2009
When I turn on my radio, the volume is on and o.k. but when I try to turn it higher or lower the volume is lost completely. Any comments?
Posted on Apr 12, 2010
SOURCE: the heater control knob will
Cable is probably kinked or slipped adjustment. There are 2 cables connected to the knob. One move the blend door in the heater box to make the air flow thru the heater core, and the other cable opens a valve in the heater hose (engine compartment) to let the hot engine water into the heater core. Check both cables for kinks and fix and kinks. It is still doesn't work, first disconnect both cables at the blend door and valve and check the door and the valve for proper operation (can you open and close them by hand?--if not, these must be repaired or replaced), then, if good, adjust the cables according to this procedure from autozone.com:
CONTROL CABLE Adjustment
Posted on Oct 20, 2010
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Fig. Side view of the control head and cable location. 1.
Footwell/defrost flap cable-2. Air distribution cable-3. Temperature
control flap cable
Fig. Temperature flap cable location and adjustment
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A special tool, such as the one shown,
is necessary to disengage the temperature control cable from the back of
the control panel
Temperature control cable component identification
Exploded view of the heater control panel mounting
Click to Enlarge
To remove the control panel, first remove the trim cover and remove the panel mounting screws . . .
. . . then disengage the locking tabs on the temperature control cable . . .
. . . and detach the control cable. Detach all wiring harness connectors and remove the panel
Prior to installing the temperature
control cable, turn the control knob and the cable indicator to the
mid-points of their ranges
Click to Enlarge
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