Thread: Digital climate issues!

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  1. #1 Digital climate issues! 
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    I have searched the forum with no luck to my particular problem. If the temp is set to 60 it blows the air at full fan speed as it should from any vent/defrost setting. As soon as I go to ANY higher degree setting the flow goes down to a trickle (even though fan speed speed is set to high) out of any vent/defrost. It will give hot air if that's what I set it to but considering its MN it would be nice to actually have a defroster that can get my windshield defrosted. It switches between vent and defrost just fine, control unit shot?
    2004 Grand Prix GT
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  2. #2 Re: Digital climate issues! 
    Turbo is the way to go. BillBoost37's Avatar
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    What does it do if you set it to 90 and press defrost? You don't defrost at 60F, 60 is only there for maximum AC. Which.. in MN this time of year, you would never want.

    The actuators can take a moment to change, IIRC GM says change the temp and give it 45 seconds to move. What is the outside temperature reading on the display?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  3. #3 Re: Digital climate issues! 
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    It moves just fine between vents and defrost it just has no velocity when the fan is set to hi, but if you leave the fan on hi and set the degrees to 60 the velocity of the air coming out is what it should be at. So basically at 60 degrees I have full velocity at ANY OTHER degree setting I have little air velocity.

    Outside temp reads just fine and correctly, the other issue I have noticed is even if you shut HVAC off before shutting off the car it will sometimes be on when you start it back up. Also it never holds your setting if you leave the HVAC on before shutting off, it won't hold which mode you have it at, my guess the unit is shot.
    2004 Grand Prix GT
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  4. #4 Re: Digital climate issues! 
    Killa Bee Scottydoggs's Avatar
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    http://www.grandprixforums.net/showt...door+actuators follow this how to open up your car so you can see the 2 round vac pumps. car running work the controls watch the arm off the vac pump for it to move. you should be able to move it by hand if its not moving. MOVE IT CAREFULLY or it can break the plastic parts. id turn the car off if you try to move them by havd so theres no vacuum pulling on it.

    the vac pump is shown in the first pic there, its the round part in the lower right. theres on one the pass side too, its in the same place. mirrored. they both need to be checked.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: Digital climate issues! 
    Turbo is the way to go. BillBoost37's Avatar
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    I'm inclined to agree that the HU seems to be shot on it. It should hold settings and 90 should do the same thing fan wise as 60 if the exterior temp is working properly.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  6. #6 Re: Digital climate issues! 
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    As I was looking for another HVAC unit I came across something interesting. That if you hold down the driver and passenger button for 5 seconds it will enter a menu and give you trouble codes for the heating/coloring system? Also that if your little man flashes on the screen of the HVAC there is a problem. Cause my little dude randomly flashes.....
    2004 Grand Prix GT
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  7. #7 Re: Digital climate issues! 
    GrandPrix Junkie Booba5185's Avatar
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    Here ya go:
    On-Board Diagnosis Mode

    The CJ2 air conditioning
    is equipped with an on-board diagnostic feature which allows the Heater-A/C
    control to detect certain system faults. The diagnostic feature may also be used
    to display certain data parameters. If the heater-A/C control detects a fault in
    the system, the man symbol will flash during the first 2 minutes of vehicle
    operation.

    Entry into the diagnostic mode is gained by pressing in on
    both temperature knobs at the same time for 5 seconds. The following display
    modes are found within diagnostics:

    The diagnostic pointer
    The diagnostic value
    By rotating the driver temperature knob one detent in either
    direction, the display is toggled between pointer and value. The value displayed
    is the decimal equivalent of the RAM contents. A 2 is formed using the minus
    sign and the leading 1 in order to display values over 199.

    A diagnostic
    pointer mode is identified by a minus sign preceding the pointer number. The
    pointer provides an index, which identifies the corresponding diagnostic value.
    The diagnostic Codes (DTCs) reside under diagnostic pointer -00. The pointer will be set to this
    position upon initial entry into diagnostics. If more than one code exists, the
    codes will be displayed sequentially at a rate of 2 seconds per fault. Rotating
    the passenger temperature knob will switch the diagnostic pointers. A wrap
    around feature is provided if the pointer is continued past either end. Other
    data used by the computer resides under different diagnostic pointers, and may
    not be of use in observing the system. Press any mode button in order to exit
    the diagnostic mode.


    Important
    A 2-digit trouble code indicates
    the fault is current. A 3-digit trouble code indicates a history
    fault.


    Clearing Codes
    Press the A/C mode button in order to clear
    codes from the heater-A/C control.

    Any of the following components may
    cause malfunction in the temperature controls:

    The refrigerant
    system
    The electrical wiring
    connections
    The vacuum connections
    Faulty components that have mechanical
    problems, such as sticking valves
    As a part of the diagnostic process inspect
    the following components:

    The refrigerant, vacuum or mechanical systems.
    Refer to Vacuum Test .
    The blower controls. Refer to 66-0 .
    The compressor
    controls. Refer to Cell 67: RPO L36, L67 .
    The air delivery controls. Refer
    to Power and Grounds .
    The temperature
    Refer to Electrical Diagnosis. Complete the diagnostic procedure for the heater
    A/C control microprocessor.


    Make sure to turn the climate control off
    first, then hit both buttons at the exact same time. I know one time it took it
    like 5 seconds, the next time it took like 15.Then rotate the left knob until
    the desired number appears.

    Position Description
    -00 Error codes Click
    here for the Trouble Codes chart
    -01 (servo position) 103-107 43-162
    -02 (servo position) 128 120-202
    -03 (servo position) 150 162-194
    -04 CJ2 Fan Speed Low=15, 29, 44, 58, 71, 86, 110=High, CJ2 Unit will
    adjust to other increments as needed
    -05 (servo position) 93 88-191
    -06
    (servo position) -152 00-252
    -07 (servo position) 00 0, 34-255
    -08 (servo
    position) -155 00-255
    -09 (servo position) 00 0, 23-255
    -10 ? 04 04
    -11
    CJ2 Vent Mode 1=Def, 2=Bilevel, 3=Auto, 4=Lower, 5=Def+Lower
    -12 Engine Temp -60 degrees 80=104, 95=131, 100=140 Peak@135°F
    -13 Actual Vehicle Speed in MPH
    -14 (servo position) 00 21=0
    -15 ? 39 44
    -16 Radiator low fan turn on temp -106 207
    -17 Radiator low fan turn off temp 196 199
    -18 ? 50 51
    -19 (servo position) 162-169 40-172
    -20 Affected by cabin temp sensor 89 50-172
    -21 (servo position) 00 ?
    -22 Sunload Sensor -117 LIGHT=126,
    218=DARK
    To return to normal operation, press the MODE button next to the
    Passenger temperature knob.


    This is a list of the Trouble Codes
    displayed by the CJ2 Unit.
    A two digit code indicates a current fault while a
    three digit code indicates a historic fault.
    Trouble Code Description
    00
    No System Fault
    01 or 101 Inside Air Temperature
    Short
    02 or 102 Inside Air Temperature Sensor Open
    03 or 103 Ambient
    Outside Temperature Sensor Short
    04 or 104 Ambient Outside Temerature Sensor
    Open
    05 or 105 LH Electric Actuator Open or Short
    06 or 106 RH Electric
    Actuator Open or Short
    07 or 107 UART Serial Data Line Fault
    08 or 108
    Solar Sensor Open


    and here, for a in depth fancy explanation of it all:
    http://www.youtube.com/watch?v=uWAW7x5h9HI
    Last edited by Booba5185; 12-21-2013 at 03:44 AM.
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  8. #8 Re: Digital climate issues! 
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    Also my temp gauge on the dash never gets above 160 in the winter, it does move but barely, this was the same on my other 3 GP in the winter, assume this is normal, can I switch my fan turn on temps at all? Or should I just do the cardboard in front of the radiator. Also the gauge does work as it got to where it should during the summer.
    2004 Grand Prix GT
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  9. #9 Re: Digital climate issues! 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Get a new thermostat if it isnt reaching over 160 on the dash.

    Sounds like its stuck open partly.

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  10. #10 Re: Digital climate issues! 
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    FFDP, what has yours reached during this cold snap we have had, will yours get up to 180-200 on a normal drive?
    2004 Grand Prix GT
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  11. #11 Re: Digital climate issues! 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Yeah, I'll see 195 everytime I drive it. It just takes a few minutes longer to reach it.

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  12. #12 Re: Digital climate issues! 
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    Weird, cuz every GP I have had ran cold in the winter, maybe I will start with that before I dig into the HVAC unit. My 3.1 sunbird ran at the 190 all day long hot or cold weather so I figured it was just a GP thing. Have owned a 2.8, 3.4 and this is my second 3.8.
    2004 Grand Prix GT
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  13. #13 Re: Digital climate issues! 
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    Ok so more on my heat issue. today it was very warm here 40 degrees, and I sat inline at the carwash for 45 minutes and my car actually got up to operating temp. But even with the fan on high speed and it set to 90 it still doesn't have the velocity, but the fan is super loud like it should be for being on high. But if I drop it down to 60 degrees the velocity goes to what it should be. Is there a specific blend door that opens up to let hot air in? It changes from floor to vent to defrost as it should so for some reason its just not getting hot air from the heater core..........
    2004 Grand Prix GT
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  14. #14 Re: Digital climate issues! 
    Killa Bee Scottydoggs's Avatar
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    the blend door actuators are what controls hot and cold air. http://www.grandprixforums.net/showt...door+actuators

    when the car is all warmed up grab both heater hoses off the back of the engine to the firewall. they should both be real hot. if one or both are cold the core is air bound or clogged.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  15. #15 Re: Digital climate issues! 
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    Well both hoses are very hot from the heater core and considering my car temp got up today I guess I can rule out thermostat and plugged radiator, still not sure why my car runs so cold though.

    Vacuum line looked in perfect condition, actually looks new. So it has to be the HU, vacuum lines at actuators or the actuators themselves.............
    2004 Grand Prix GT
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  16. #16 Re: Digital climate issues! 
    Killa Bee Scottydoggs's Avatar
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    follow that how to. reach in put your finger on the white parts that spins, then work the controls. you'll feel it turn if its working.

    you can also take one out, the pass side is super easy to get to, remove it, then turn the knob by hand, see if you get heat manually.

    i went for a over a year with no actuators, just flipping them seasonally lol. yeah it sucked....

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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