I was going to go to the dealer and see i could get this fixed but thought maybe i could same some money if you guys had some ideas because i am stumped. maybe its a setting that i am not familiar with since this is my first corvette.

When i turn on my heater i crank it all the way up and it does not get hot on the drivers side but it does on the passenger side.

the reason i think it may be a setting is because when i have the drivers side turned all the way to 90 degrees and turn the fan up, the AC light comes on and the air is cold, even though its all the way to 90.

if its not a setting i guess it would have to be in the ducting and it not opening or something. has anyone had an issue like this and could help me out? anything would be great.

thanks guys!

 

The first thing is to check and see if you have any codes on the DIC. It sounds like maybe the drivers side actuator is not working, but first check and see if you have any codes on the DIC, then post again. There are a number of things that you can try, but start with this first.

 

As stated above it is more than likely the drivers side actuator. It may or may not throw a code. There are several different procedures to calibrate the actuators you could try. If you do a search on "HVAC actuators" you will find the procedures. The plastic gear inside likes to crack after a few years..... Good news is the drivers side can be changed without pulling the entire dash. You should be able to fix without taking it to the dealer.

Good luck

 

Hope we can help you vs going to the stealership.

Pull ALL your DTCs and see if there are any HVAC specific codes Heres a write up on how to do it:

READING YOUR Engine Diagnostic Trouble Codes (DTC)

This procedure should be carried out any time you experience a problem with your C5. Most inexpensive store bought aftermarket code readers will ONLY read power train DTC’s. Reading the DTC’s with the C5 built in code reader will allow you to read ALL the modules in the vehicle.

The Diagnostic Display Mode is entered with the following procedure:
1) Turn on the ignition but don't start the engine.
2) Press the RESET button to turn off any warning messages. (i.e. door open, trunk open ect)
3) Press and hold the OPTIONS button
4) While holding OPTIONS, press FUEL button four times within a 10 -second period.

Initially, the on-board diagnostics go into an Automatic Mode which will cycle through each module and shows diagnostic codes in a pre-set sequence: PCM - TCS - RTD - BCM - IPC - RADIO - HVAC - LDCM - RDCM - SCM - RFA. All codes will be displayed for each module. ( i.e. PCM = 4 codes) If none are present in a given module, you will see No More Codes on the display.

There are two types of diagnostic codes, Current and History designated with a letter suffix, “C” or “H”. A current code indicates a malfunction is present in the module displaying data. A history code indicates a problem existed sometime in the last 40 or 50 ignition cycles. When not accompanied by a current code of the same number, it's potential evidence of a previous problem, now resolved, that was not removed by clearing the codes. More likely it's an indication of an intermittent malfunction.

Intermittent codes are the most challenging of the diagnostics. An intermittent code may have happened once, may have happened more than once but is inconsistent or may be happening on a regular basis but not at the time the codes are displayed. History codes can also be caused by a current malfunction in a system that is not operating at the time codes are displayed. An example is the rear window defogger which doesn't operate until the Body Control Module detects engine rpm. For history codes set by a module that does not operate with the key on and engine off, a special diagnostic tool called a Scan Tester is necessary to properly diagnose the malfunction.

Once the system has displayed all modules, it goes into the manual mode which allows selection of each module using combinations of Driver Information Center buttons. Manual mode can also be entered during the automatic sequence by pressing any button except E/M. Once the display shows Manual Diagnostics, select a module by pressing the OPTIONS button to go forward or the TRIP button to go back. Once a module is selected, a code is displayed, and if more than one are present; press GAGES to go forward or FUEL to go back.
To exit the diagnostic mode at any time, press E/M. If you want to erase codes in a given module, press RESET To reset the codes once in manual mode, press and hold RESET until it displays NO CODES Press OPTIONS to go to the next module. Repeat the steps until you have reset the codes in all the computer modules.
NOTE!! Only reset the codes IF you want to - it is NOT necessary to do this. Clearing a code does not repair a problem. You are simply erasing the evidence of it in the module's memory. If you clear the code/s, and extinguish the Check Engine Light, your emissions status ready will NOT allow you to pass an emissions test until you have completed the required driving cycles. There are a few body module DTC’s that if set will prevent the module from operating properly. Once the DTC is cleared, the module will return to full function. This is not true for power train DTCs.

If you have never read and cleared your codes, there will probably be a lot of old history DTCs. It is recommended that you clear your codes and see if any come back during a driving cycle. Those are the ones that you need to concentrate on diagnosing.

Once you have the codes, the next question is: What to do with the information?
First, consult the factory service manual. Any serious C5 Do-It-Yourself owner should invest in the Corvette Service Manual of the appropriate model year. The Service Manual is really a requirement if you want to understand and work on your C5.

NOTE and a WARNING. You can read the DTCs while the engine is running. I pull mine up all the time while driving.
WARNING. Don’t become distracted while reading DTCs while your driving and cause an accident!!!!! Use common sense and drive safe.

These are some very good C5 Diagnostic Trouble Code (DTC) explanation web sites!!! They also explain how to read the DTCs

Here are some very good sites that explain what DTC mean:

http://www.gearchatter.com/viewtopic11755.php

http://www.obd-codes.com/trouble_cod...d-ii-codes.php

Make sure to include the H or C suffix when you post your DTCs!!


Clear ALL the DTCs and see if that fixes the issue. If it doesnt, let us knao and we can provide you more guidance.

BC

 

THANKS SO MUCH GUYS!!! wasnt really looking forward to taking it to the dealer. As soon as i get home i will check any codes. I hooked up my scanner and there were no DTCs but i will check on the dash. this car is definitely a little more complex than the Trans Am I had before.

 

Yeah, I think you'll find a code for the driver's side actuator. You should clear the code and see if it'll come back to life (write it down first and post it) but if the code comes back, you'll need to replace the actuator. The driver's side is not an easy job but it can be done by you. I just replaced mine. A few foul words, scrapes and scratches on my hands and arms...but it can be done.

 

CRAP!!! i just pulleed all of the codes and there were ton of history codes. i cleared them all and started it up. they were all history but one came back with a history and a current code. it was B0441 under the HVAC. i guess i have to start digging into the dash...

any tips?

thanks again guys.

 

I'm guessing i need the automatic actuator huh?

Only because that is the one that is $140 versus the manual one that is $35...no clue

 

Look at post #12 here ....http://forums.corvetteforum.com/c5-t...ease-help.html

I think you can find them cheaper if you check around........

 

Heres some info: A service bulliten and a tech manual page:

#PI01069 CJ2 HVAC DTCs B0361 , B0441 and Drivers Side AC Blows Warm - accumulator air automatic compressor condenser condition control display evaporator head inoperative temperature vent - (May 8, 2003)

HVAC Systems - Automatic

CJ2 HVAC DTCs B0361 , B0441 and Drivers Side AC Blows Warm - accumulator air automatic compressor condenser condition control display evaporator head inoperative temperature vent #PI01069 - (May 8, 2003)
CJ2 HVAC DTCs B0361, B0441 and Drivers Side AC Blows Warm - accumulator air automatic compressor condenser condition control display evaporator head inoperative temperature vent
.

When servicing the vehicle with the VIN you entered, the following diagnosis might be helpful if the vehicle exhibits the described symptoms.

Condition/Concern:
CJ2 may experience an HVAC control head that will not properly control air mix doors after a battery disconnect. The vehicle may have a temperature difference side to side and may set DTCs B0361 and/or B0441. A typical complaint may be that the right side cools down, but the left side is warm.

Recommendation/Instructions:
Air mix door mechanical linkage build variance or wear may cause a slight over travel condition of the door. Whenever battery power is interrupted from the HVAC control module, it will perform a recalibration of the actuators once reconnected. During recalibration, the HVAC control module will drive the actuators to their minimum and maximum travel extremes (5 and 250 counts). The module issues a travel command to 0 counts, but expects to see feedback slightly less as the door hits the cold stop in the case. The 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 and the temp door bias toward warm is the DTC failure action.

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 (wear, damage foam seals, etc.).

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 for 60 seconds) or with the scan tool.

If thorough diagnosis of the electrical system shows all electrical components to be ok, replacement of the HVAC control module with a 2001 or newer part number is required

If this has already been done, a reset/re-time the actuators internal feedback sensor to lag slightly behind the actual position can be performed. Open the actuator case and reset the output gear and sensor gear by only 1 gear tooth. This will allow a feedback of 4 counts when performing learn.

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. If these steps do not resolve the condition, please contact GM TAC for further diagnostic assistance. This diagnostic approach was developed for the vehicle with the VIN you entered and should not be automatically be used for other vehicles with similar symptoms.



GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


© Copyright General Motors Corporation. All Rights Reserved.


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Document ID# 1327059
2001 Chevrolet/Geo Corvette


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DTC B0441
Circuit Description
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



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Document ID# 783387
2001 Chevrolet/Geo Corvette


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I bought a replacement actuator from Rockauto and it was half the price of the OEM. It looked the same and works just fine for me.