My car is 2001. I have the dreaded hot air drivers side cold air passenger side. I've checked the 134 and its good. I've done the #27 fuse trick. My question is if the actuator door is bad or out of time will I have any HVAC codes? because I don't have any. Also now the air will blow cold on passenger side while sitting still but when I drive the air on the passenger side starts to blow hot also.

 

Hi, I'm assuming you have the Dual Zone System--the following are the dtc codes that can be set when actuator problems exist
LEFT--B0361, B0363, B0441..
RIGHT--B0365, B0367, B0446
There can be a problem even if these codes don't set.

Post your ref pressures, low and high side at 2000rpm's.
Does your control head read the outside temp right.
If you set the driver side dial at 60, and the pass side straight up do you get cold air steadily from any side at idle and when moving.
Is the compressor going off and on,(short cycling).
Are your mode vents operating properly.
With a bit more info we can help.
Good Luck

 

Thanks bestvettever. Heres Whats going on. When we charged it the air blew cold on the way home. The next day just the passenger side cold, checked refrigerant again and for leaks, found none. Put a little more refrigerant in (you know a little more can't hurt) blew cold again on both sides on the way home about 10 miles. The next day cold on passenger side while idling ambient temp on drivers side. As soon as I drive a short ways down the street, 1/4 mile ambient on both sides. The low pressure is 36 the high is between 280-300 as per the chart at 2000 rpms. The control head reads correct. I did try the passenger *** straight up but no help. It doesn't sound like the compressor is cycling. the mode vents appear to be working correct. Thanks again.

 

Hi a few more questions, first a bit more ref is not neccessarily a good thing, it needs to be the proper amount. But your pressures sound matched to the chart ok, if they also matched the outside temps and humidity from the chart. Is your condenser clean and the space between the condenser and radiator. The pressures that you posted did you check them when the car was in the not blowing cold mode. What I mean is when you are having the condition of the ac blowing warm , check the pressures and let us know what they are then. What may be happening is , When you first start out and the car is cold, the ac blows cold because even though bad actuators are sending the air through the hearter core, there is no heat in there yet, as the car warms up the bad actuators sending the air through the heater core heat the incoming air because there is sufficient heat to do so at that point. And even though you are calling for cold the actuators are not responding properly. Other possibilitys are the sensors, the outside temp sensor will cause insuffucient cold air if it is faulty, but not the differential on the 2 zones, and the same can be said of the inside temp sensor, and the sunload sensor. So if the ref charge is proper it is a good bet that you have bad actuator motors or the doors themselves are blocked , deformed, or the seals have deteriorated. If you can take enough apart to get a look at them and do the fuse 27 pull and watch them to see if they go through their full motion of recalibration. Below are some diagnostics and instructions if you feel you need them.
Good luck
++++++++++++++++++++++++++++++++++
Air Temperature Actuator Replacement - Left
Removal Procedure
Remove the front floor kick-up panel. Refer to Kick-Up Panel Replacement - Front Floor in Interior Trim.
Remove the Bose module. Refer to Bose Module Replacement in Entertainment.



Disconnect the inside air temperature sensor aspirator duct.
Depress the duct retaining tab and remove the duct from the ignition switch housing bracket.
Use a twisting motion to release the duct from the duct muffler.




Remove the inside air temperature sensor aspirator duct muffler. Use a twisting motion to release the duct muffler.



Disconnect the air temperature actuator electrical connector.



Remove the air temperature actuator screws.
Remove the air temperature actuator.
Installation Procedure




Position the air temperature actuator, then align the slots in the actuator driver to the flats on the temperature door shaft.
Slide the air temperature actuator onto the shaft, while aligning the actuator locating hole to the forward alignment pin on the HVAC module case. The actuator should be completely seated onto the temperature door shaft and be the actuator mounting holes should be flush with the mounting bosses on the HVAC module case.

Notice
Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


Install the temperature actuator retaining screws. Tighten
Tighten the screws to 1.5 N·m (13 lb in).





Connect the air temperature actuator electrical connector.



Install the inside air temperature sensor aspirator duct muffler. Use a twisting motion to secure the duct muffler.



Install the inside air temperature sensor aspirator duct.
Use a twisting motion to secure the duct to the duct muffler.
Install the duct retaining tab to the ignition switch housing bracket.
Install the Bose amplifier. Refer to Bose Module Replacement in Entertainment.
Install the front floor kick-up panel. Refer to Kick-Up Panel Replacement - Front Floor in Interior Trim.
Recalibrate the actuators. Refer to Re-Calibrating Actuators .
++++++++++++++++++++++++++++++++++
The HVAC control module commands the left air temperature actuator movement with one of three voltage signals applied to the left air temperature door control circuit. A low voltage of 0 volts moves the left air temperature door toward full cold. A voltage of 2.5 volts stops the door. A voltage of 5 volts moves the left air temperature door toward full hot. The HVAC control module determines the current position of the actuator by monitoring the feedback voltage of the left air temperature door position signal circuit. The feedback potentiometer position is a function of the actuator position. A high voltage indicates a full cold left air temperature door position. A low voltage indicates a full hot left air temperature door position. The HVAC control module controls the left air temperature door position in order to maintain the selected air temperature.

Whenever the HVAC control module keep alive memory battery power is interrupted, the HVAC control module will perform a recalibration of the actuators. During recalibration, the HVAC control module will drive the actuators to their minimum and maximum travel extremes. The HVAC control module will then calculate a travel range from this data and compare it to a calibrated range within the HVAC control module. If the actual travel range is not within the calibrated expected range, the actuator will be considered not calibrated and the DTC will set.

Conditions for Running the DTC
The ignition is turned ON.
The HVAC control module power must be interrupted.
Conditions for Setting the DTC
The left air temperature actuator actual total travel range is less than or greater than the calibrated limits.

Action Taken When the DTC Sets
The HVAC control module will continue to make use of whatever left air temperature actuator travel range is still available.
Each time the ignition switch is turned ON the HVAC control module will perform a recalibration of the actuator.
Conditions for Clearing the DTC
The left air temperature actuator travel range error must be corrected.

Diagnostic Aids
The range fault code can only be detected following a check of the left air temperature actuator travel range. The left air temperature actuator travel range check can only be initiated by disrupting power to the HVAC control module (disconnecting the battery) or with the scan tool.
The calibration limit is 147 - 220 counts (2.9-4.4 V). An actual range below this limit suggests an obstruction, something stuck in the door limiting travel. An actual range above this limit suggests an over travel condition, damaged or missing foam seals.
If condition not present, refer to Testing for Intermittent and Poor Connections in Wiring Systems.
Step
Action
Values
Yes
No

Schematic Reference: HVAC Schematics

1
Did you perform the HVAC Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check - HVAC Systems - Automatic

2
Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, command the Left Mix Motor ON and OFF to display the maximum and the minimum counts of the LH Mix Motor Position Feedback in the Heating and Air Conditioning, Special Functions, Miscellaneous Test list.
Subtract the minimum LH Mix Motor Position Feedback from the maximum LH Mix Motor Position Feedback.
Does the result of the calculation indicate that the actual travel of the left air temperature actuator is within the specified range?
147-220 counts
Go to Diagnostic Aids
Go to Step 3

3
Test the ignition 3 voltage circuit of the left air temperature actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 13
Go to Step 4

4
Test the air temperature door control circuit of the left air temperature actuator for an open, high resistance, short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 13
Go to Step 5

5
Test the 5 volt reference circuit of the left air temperature actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 13
Go to Step 6

6

Important
The left air temperature actuator connector and the HVAC control module connector must be connected to correctly perform test.


Turn ON the ignition, with the engine OFF.
With the scan tool, observe the LH Mix Motor Position Feedback data parameter.
Connect a 3 amp fused jumper wire between the air temperature door control circuit and the 5-volt reference circuit of the left air temperature actuator. This action drives the actuator to the full HOT position.
Remove and reconnect the jumper wire between the air temperature door control circuit and the low reference circuit of the left air temperature actuator. This action drives the actuator to the full COLD position.
Does the left air temperature actuator drive shaft rotate and do the counts change?
--
Go to Step 7
Go to Step 9

7
Measure the voltage from the temperature door control circuit of the left air temperature actuator to a good ground.
With a scan tool, command the Left Temp Door Position from Hot to Cold.
Does the voltage measure near the specified value when increasing temperature, near the specified value when decreasing temperature and near the specified value when stationary?
0V decreasing 5V increasing 2.5V stationary
Go to Step 8
Go to Step 10

8
Inspect the left air temperature door and the left air temperature actuator for the following conditions:

A misaligned air temperature actuator. Refer to Air Temperature Actuator Replacement - Left .
A broken or binding linkages or air temperature door
An obstruction that prevents the air temperature door from operating within it's full range of motion
Missing seals to the air temperature door
Misaligned seals to the air temperature door
Did you find and correct the condition?
--
Go to Step 13
Go to Diagnostic Aids

9
Inspect for poor connections at the harness connector of the left air temperature actuator. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 13
Go to Step 11

10
Inspect for poor connections at the harness connector of the HVAC control module. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?
--
Go to Step 13
Go to Step 12

11

Important
Perform the recalibration procedure for the left air temperature actuator.


Replace the left air temperature actuator. Refer to Air Temperature Actuator Replacement - Left .

Did you complete the replacement?
--
Go to Step 13
--

12

Important
Perform the recalibration procedure for the HVAC control module.


Replace the HVAC control module. Refer to HVAC Control Module Replacement in Body Control System.

Did you complete the replacement?
--
Go to Step 13
--

13
Use the scan tool in order to clear the DTCs.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?
--
Go to Step 2
System OK

 

will tomorrow am thanks