Question about 2004 Toyota Sequoia
I have a 2004 Sequoia and am having problems with the temperature control on the heater. It runs ice cold when I turn the control to cold, but if I turn it to 69, the heater kicks in and it blows only very hot air - there is no in between and it doesn't matter what temperature I turn it to it is still blazing hot unless I set it to COLD. I have tried it with the a/c on and with the a/c off, it is still freezing or super hot. Thanks for any help!!!!
The heater control valve on the engine's firewall may be out of adjustment. There shouldn't be a gap in the valve when the a/c is on max cold.
Posted on Aug 31, 2009
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Posted on Jan 02, 2017
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Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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