AC works fine for passenger side and not the driver side - STS 2001
Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds / (Old System)

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

CadillacForums.com is the premier Cadillac Forum on the internet. Registered Users do not see the above ads.
+ Reply to Thread
Page 1 of 2 1 2 LastLast
Results 1 to 15 of 19
Cadillac Seville / Cadillac Eldorado Forum Discussion, AC works fine for passenger side and not the driver side - STS 2001 in Past Cadillac Vehicle Discussion; STS 2001 air conditioning is working fine for the passenger side but driver side is not working. Outside temperature was ...
  1. #1
    john19999 is offline Cadillac Owners Fanatic
    Automobile(s): Seville STS 2001, Eldorado 1997
    Join Date
    Jun 2008
    Location
    Chicago, IL
    Posts
    343

    AC works fine for passenger side and not the driver side - STS 2001

    STS 2001 air conditioning is working fine for the passenger side but driver side is not working. Outside temperature was 74 F, both driver and passenger side were set to 60 F each. The passenger side duct was measured at 49 F whereas driver side was about 72.

    Any ideas what should I check. I know there is some temperature related device near steering column inside a small duct. Is this device a suspect? Any ideas please what to check.

    Thanks
    John

  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
    Automobile(s): 2002.5 F55 STS/65500mi, 2004 Ford F150 SuperCab4x4
    Join Date
    Feb 2006
    Location
    MD Eastern Shore - Kent Island
    Age
    74
    Posts
    45,006

    Re: AC works fine for passenger side and not the driver side - STS 2001

    It's not the aspirator - Cabin Air Temperature sensor (in the tunnel left of the steering column). You get to that module by yanking the flat window vent end panel off the dash. The small hex head sheet metal screw. Mechanics fingers, snake out the wiring harness, snake out the module. Lube the fan. (Computer 12V muffin fan).

    Start tracking down the trouble codes for the three air/vent/temperature mode and blend door electric (stepper motor) actuators.

    Maybe - just maybe - turn the system OFF - the button. Disconnect the battery for a few minutes. See if the actuators wake up. If not, surf through Tech Tips for actuator diagnosis and replacement steps.

  4. #3
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,836

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Codes John, codes. As Sub said. do you have one for a body code for an actuator? If not, you're probably a tad low on refrigeration.

  5. #4
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
    Join Date
    Feb 2004
    Location
    Minnesota
    Age
    63
    Posts
    10,074

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Quote Originally Posted by john19999 View Post
    STS 2001 air conditioning is working fine for the passenger side but driver side is not working. Outside temperature was 74 F, both driver and passenger side were set to 60 F each. The passenger side duct was measured at 49 F whereas driver side was about 72.

    Any ideas what should I check. I know there is some temperature related device near steering column inside a small duct. Is this device a suspect? Any ideas please what to check.

    Thanks
    John
    ==================
    you have more than one issue -

    with ambient temp of 74 -
    duct temp SHOULD be 37 to 40 -

    you might also have a mix door hanging up -

    -------------------

    check for codes -
    you might find "B" codes - relating to the "number 1 actuator" -

    -----------------

    I believe your system is low on freon -
    but the ONLY wat to diagnose this -
    is to connect a QUALITY set of gauges -
    and post BOTH the high side pressure and low side pressure readings -

  6. #5
    john19999 is offline Cadillac Owners Fanatic
    Automobile(s): Seville STS 2001, Eldorado 1997
    Join Date
    Jun 2008
    Location
    Chicago, IL
    Posts
    343

    Re: AC works fine for passenger side and not the driver side - STS 2001

    There are no B codes. I will check Freon pressure and will charge if required. Once charged and still issues. I will look to replace actuator. It seems that there are several actuators. Trying to figure out which actuator to change. The tech tips has some limited info. Is Mix door a part of actuator?

    John19999

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,836

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Be sure to use a good set of A/C gauges, not the single low pressure gauge that comes on the cans. You can also check the inlet and outlet pipes on the firewall. They should both be cold and the same temperature. Cold to the touch is good, but an IR thermometer is better.

    We'll worry about which actuator if it comes to that.

  8. #7
    john19999 is offline Cadillac Owners Fanatic
    Automobile(s): Seville STS 2001, Eldorado 1997
    Join Date
    Jun 2008
    Location
    Chicago, IL
    Posts
    343

    Re: AC works fine for passenger side and not the driver side - STS 2001

    I am planning to fix my car this week. Starting with charging and looking at air temperature actuator that controls driver side temperature. Any idea about the location of this actuator. Is it in the driver side under dashboard?

    Thanks
    John

  9. #8
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
    Join Date
    Feb 2004
    Location
    Minnesota
    Age
    63
    Posts
    10,074

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Quote Originally Posted by john19999 View Post
    I am planning to fix my car this week. Starting with charging and looking at air temperature actuator that controls driver side temperature. Any idea about the location of this actuator. Is it in the driver side under dashboard?

    Thanks
    John
    =====================
    I am planning to fix my car this week.
    Starting with charging

    you do NOT simply put additional freon in the system -

    only analyzing BOTH high and low pressure readings
    will determine whether or not you need more freon -

    Trying to figure out which actuator to change.
    The tech tips has some limited info.

    the #1 actuator controls the mix door for the driver side of the system -

    Is Mix door a part of actuator
    the MIX DOOR controls the air flow -
    the actuator controls the mix door -

  10. #9
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,836

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Are you SURE you need an air mix door actuator? Do you have a DTC telling you that it has malfunctioned? Have you verified low refrigerant yet?

    Not sure which is the drivers side actuator, but I think it's #44. compare it to #15 and see which one doesn't move when you change the temperature.

    http://www.gmpartsgiant.com/Page_Pro...030&SortKey=10

  11. #10
    john19999 is offline Cadillac Owners Fanatic
    Automobile(s): Seville STS 2001, Eldorado 1997
    Join Date
    Jun 2008
    Location
    Chicago, IL
    Posts
    343

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Thank you basscatt and Ranger. I have not yet checked Freon pressure and will check next weekend. There are no B code s or no DIM codes. Today when outside temperature was 87, The 2 passenger side ducts as well as the rear air were real cold. However, the 2 driver side ducts were relatively much warmer. From this observation, I believe that the#1 actuator is malfunctioning. The door must be stuck. Can some one please describe what this blend door controls. Does it block air from the evaporator. Is there any link that provides details as how blend door works. Thanks

  12. #11
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,836

    Re: AC works fine for passenger side and not the driver side - STS 2001

    If the drivers side is "warm" (ambient) temperature as opposed to "hot", then I'd suspect low refrigerant. Have you checked the inlet and outlet pipes like I told you in post #6?

    Can some one please describe what this blend door controls. Does it block air from the evaporator.
    These cars do not have a heater control valve that controls how much hot coolant flows through the heater core. The core has full flow all the time. Cabin temperature is controlled by blending the amount of outside air that is allowed through the core. If no heat is requested, the blend door is closed and the heat is dumped over board.

  13. #12
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
    Automobile(s): 89 Coupe DeVille, 95 Sedan DeVille, 03 SLS, two 02 DHS's
    Join Date
    Feb 2004
    Location
    Minnesota
    Age
    63
    Posts
    10,074

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Quote Originally Posted by john19999 View Post
    Thank you basscatt and Ranger. I have not yet checked Freon pressure and will check next weekend. There are no B code s or no DIM codes. Today when outside temperature was 87, The 2 passenger side ducts as well as the rear air were real cold. However, the 2 driver side ducts were relatively much warmer. From this observation, I believe that the#1 actuator is malfunctioning. The door must be stuck. Can some one please describe what this blend door controls. Does it block air from the evaporator. Is there any link that provides details as how blend door works. Thanks
    ============================
    From this observation,
    I believe that the#1 actuator is malfunctioning

    this is why complete diagnosis is required -

    the actuators ARE monitored -
    generally - if they do not respond properly -
    a code is set -
    the exception would be a broken linkage -
    between the actuator and the mix door -
    where the actuator IS moving properly -
    but the door doesn't move because it is not connected -

    you need to approach this with logic -

    check the pressures first -

  14. #13
    john19999 is offline Cadillac Owners Fanatic
    Automobile(s): Seville STS 2001, Eldorado 1997
    Join Date
    Jun 2008
    Location
    Chicago, IL
    Posts
    343

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Temperature in Chicago has dropped again to below 60F and I will have to wait a few days before I can check freon pressure. I am trying to read how air circulates in STS 2001. I could not find any good link. Does air from blower is divided into 2 parts, one flows to evaporator core and the other part flows to heater core and finally are mixed/controlled using blend door? Is there any good link that provides any description?

    Thanks
    John

  15. #14
    john19999 is offline Cadillac Owners Fanatic
    Automobile(s): Seville STS 2001, Eldorado 1997
    Join Date
    Jun 2008
    Location
    Chicago, IL
    Posts
    343

    Re: AC works fine for passenger side and not the driver side - STS 2001

    Can anyone please share how air is distributed from blower to ducts. Does air pass through evaporator core first and then throuuh heater core or is there any parallel arrangement. I tried to search but could not find any link. Or do you know any link that provides some info.

    Thanks
    John

  16. #15
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Location
    Woodstock Ill.
    Age
    66
    Posts
    73,836

    Re: AC works fine for passenger side and not the driver side - STS 2001

    You have it correct. It passes through the evaporator first, then through the heater core.

Quick Reply Quick Reply

Register Now

Please enter the name by which you would like to log-in and be known on this site.
If you do not want to register, fill this field only and the name will be used as user name for your post.

Please enter a password for your user account. Note that passwords are case-sensitive.

Please enter a valid email address for yourself.

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Bookmarks

Cadillac Posting Rules

  • You may post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
Read about Lincoln | Buick | Kia Forte Forum
Need products for your Cadillac? Check out your options at the links below:

custom floor mats | Cadillac Chrome and Black Chrome Wheels | window tinting