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If the driver's blend door actuator has failed completely, or the wiring to it is damaged, you will not hear any clicking. Check for appropriate voltage at the blend door actuator, and determine from there if it's the actuator or the control unit.
you have probably been misinformed. The needle on the temperature gauge is controlled by the temperature SENDER unit ( not the temperature SENSOR unit) The sender unit is a single wire unit that is a resistance unit affected by heat of the coolant, The hotter the coolant the less resistance the higher the reading
The temperature sensor unit is a 2 wire unit that tells the ECM when to switch on the fan, when to go into limp mode if overheating and when to adjust the air/fuel mixture as the coolant warms up
What does this mean?
The Intake Air Temperature Sensor measures the rise and fall of the air temperature inside the Intake Manifold. This provides critical data needed for the Powertrain Control Module (PCM) to control the Air Fuel Ratio, the Ignition Spark Timing and many components of the Emission Control Systems.
Code P0113 sets when the voltage signal to the PCM from the Intake Air Temperature Sensor Circuit stays above 4.5 volts while the Coolant Temperature Voltage readings are rising and falling within an appropriate range. Symptoms
Check Engine Light will illuminate
In some cases, the engine may be hard starting and/or get poor fuel economy
Poor engine performance/hesitation on acceleration
Common Problems That Trigger the P0113 Code
Defective Intake Air Temperature Sensor
Dirty air filter
Defective Mass Air Flow Sensor
Faulty or corroded Intake Air Temperature Sensor wiring or connections
Intake Air Temperature Sensor is replaced when the real cause is a dirty air filter
Intake Air Temperature Sensor is replaced when the real cause is a poor connection or chafed wiring
Intake Air Temperature Sensor is replaced when the real problem is in the Mass Air Flow Sensor
P0113 Diagnostic Theory for Shops and Technicians
When diagnosing a P0113 code, it is important to record the freeze frame information and then to duplicate the code setting conditions with a test drive while paying close attention to engine load, throttle position, RPM, and road speed on a data streaming scan tool. As you drive the vehicle, compare these values to the Intake Air Temperature Sensor PID or parameter ID. The Intake Air Temperature Sensor voltage values should rise and fall with changes in engine temperature. Compare the Intake Air Temperature or IAT readings to the Coolant Temperature Sensor readings, as they should move in tandem with each other. However, the Engine Coolant Temperature sensor will have a much higher temperature range.
Check the IAT sensor connector with the key on and the engine off. There needs to be a steady 5 volt reference voltage and a very good ground. Find and use the proper engine performance wiring diagram to discern the proper color and position of these wires in the connector.
It never hurts to do a key on-engine off voltage output test of the IAT sensor. Typically, I CAREFULLY use a heat gun to raise the temperature of the area around the sensor and study the change in values of the Intake Air Temperature. It's important to use the scan tool data stream as this will verify the IAT harness and connections.
from what i have just read on other sites its the temp gauge thermostat for the fan as well.. so can only go on what they say. this is another site - The ECT (Engine coolant temperature) sensor is a thermistor located in the engine block or other coolant passage. It changes resistance with changes in temperature of the coolant that it's in contact with. It's usually a two wire sensor. One wire is a 5 volt reference from PCM (Powertrain Control Module) and the other is a ground supplied from PCM. As the temperature of the coolant changes, the resistance of the sensor changes. When the engine is cold, the resistance is high. When the engine is warm, the resistance is low. If the PCM detects a signal voltage lower than the normal operating range of the sensor then P0117 code will set.
First what engine are you talking about? If it is chain driven, then it must be the 2AZ-FE engine. If so, I do not understand why the chain would need to be replaced simply because the vehicle was unused for a few years. Also, the water pump on that engine is external and is not driven by the timing chain, so I fail to understand what changing the timing chain would have to do with engine temperature unless you did not put the serpentine belt on correctly and the pump is running backwards or something.
I also do not know why you say there is a problem with the temperature when you say the temperature is in the middle-----theat is where it is SUPPOSED to be. If you think your gauge is reading incorrectly, then that is what must be diagnosed. First, you must verify that it is incorrect by measuring actuall engine temperature with an infrared thermometer next to the temperature sensor. Then you must compare the actual temperature reading with the ECT data in the engine control computer to see if the computer is reading it correctly. If it is reading it correctly and your gauge is reading too high, then there is a problem with the gauge in the instrument cluster. If the computer is not reading the temperature correctly, then you either need to replace your temp sensor or repair the circuit between the temp sensor and the computer.
The hard starting could be caused by a whole bunch of things. You could be off on your cam timing. You may have installed the Crankshaft Position Sensor Plate upside-down. It could be something like you have a tank full of rotten gas if the vehicle has been sitting for 3 years.
If you are going to a mechanic that is advising really dumb "fixes" like leaving sensors unplugged to get your cooling fans to turn on, I would highly recommend going to a different mechanic.
To change the temperature reading from C to F (or vice versa), press and
hold the recirculation button, then press the off button holding the
switch down for 3 seconds or more until an audible beep is emitted. If
the battery is disconnected and then reconnected, the temperature
reading will revert to C. Turning the ignition on/off will not change
the customer's set preference. (See http://www.discotech.info/index.php?title=Climate_Control for more customer configuration options for the climate control)