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posted 3 times ,
the 523330 code is for the blend door actuator.
HVAC ,means heating ventilation and air conditioning
system.
in driver parlance means AC cooling or heating to the cab.
the huge box under the dash has dampers insides one is called.
blend. (it blends hot and cold air to what you want)
it is stuck, and many times just the actuator motor to it is bad
sorry no huge truck manuals here, so cant guess.
but most modern are use electric motor drive damper actuators.
it has nothing to do with engine, if it gets fully hot and hot air from the dash is good, no country told.
You need to determine which sensor is causing the check engine light to come on. being a freightliner the most likely culprit is the engine oil pressure
freight liners use 3 different engines and all of the fault codes are different
if yours is a Detroit 15 engine go to a service shop for Detroit and have the code explained
an answer from just answers reports this
ecu 1 fault means the engine ECM has an internal fault and needs to be replaced
most of the time with this code it is not the ECM itself but usually a wiring problem going to the ECm
there should be 2 fuses for the ECM either next to the ecm in plastic covers by a starter or in a plastic box
check all wiring going to and from the engine and battery grounds
especially the grounds
check for wires rubbed through and loose terminals
take it to a service dealer for a proper diagnosis as it costs money wasting time trying to find the fault yourself as a truck standing still is not earning it's keep
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