Results 1 to 2 of 2
Discuss A/C Pressure Sensor Simulate, 94 Chev. Lumina Sedan in the alt.autos.gm forum at Car Dealer Forums; Hi, My Mom's 94 Chev Lumina (V6 3.1 liter) A/C stopped working. In a process ...
  1. #1
    Brad
    Guest

    Default A/C Pressure Sensor Simulate, 94 Chev. Lumina Sedan

    Hi,

    My Mom's 94 Chev Lumina (V6 3.1 liter) A/C stopped working. In a process
    of elimination (see "Test Results" below), I have eliminated some things
    already. Note: The A/C compressor clutch doesn't engage when A/C is turned
    on. According to Haynes service manual, this car (3.1 liter engine) doesn't
    have pressure switches (I couldn't find any).

    I removed the connector (3 wires) from the A/C pressure sensor.
    This sensor symbol in a Haynes service manual looks like a potentiometer
    with ground on one end, +5V on the other and a wiper arm (pressure).
    The wires run to the ECM. It is extremely difficult to measure the sensor
    resistance so I can use a regular "pot" of the same resistance to simulate
    the pressure sensor.

    A Google search did not reveal the information I need.

    Do you know any tricks to eliminate the pressure sensor?

    Thanks in advance, Brad

    TESTS RESULTS:

    My cousin brought his A/C pressure gauge and said the pressure was normal
    (checked on low side) with engine running A/C on "MAX".

    I checked the A/C relay in my service shop and checked the "HVAC" fuse
    (only fuse for AC). I disconnected the connector from the compressor clutch
    and checked for voltage with engine running and A/C on "MAX". No voltage.






    › See More: A/C Pressure Sensor Simulate, 94 Chev. Lumina Sedan

  2. #2
    80 Knight
    Guest

    Default Re: A/C Pressure Sensor Simulate, 94 Chev. Lumina Sedan

    "Brad" <bpetria@verizon.net> wrote in message
    news:44cf689d.1450294@news.bellatlantic.net...
    > Hi,
    >
    > My Mom's 94 Chev Lumina (V6 3.1 liter) A/C stopped working. In a
    > process
    > of elimination (see "Test Results" below), I have eliminated some things
    > already. Note: The A/C compressor clutch doesn't engage when A/C is
    > turned
    > on. According to Haynes service manual, this car (3.1 liter engine)
    > doesn't
    > have pressure switches (I couldn't find any).
    >
    > I removed the connector (3 wires) from the A/C pressure sensor.
    > This sensor symbol in a Haynes service manual looks like a potentiometer
    > with ground on one end, +5V on the other and a wiper arm (pressure).
    > The wires run to the ECM. It is extremely difficult to measure the
    > sensor
    > resistance so I can use a regular "pot" of the same resistance to simulate
    > the pressure sensor.
    >
    > A Google search did not reveal the information I need.
    >
    > Do you know any tricks to eliminate the pressure sensor?
    >
    > Thanks in advance, Brad
    >
    > TESTS RESULTS:
    >
    > My cousin brought his A/C pressure gauge and said the pressure was
    > normal
    > (checked on low side) with engine running A/C on "MAX".
    >
    > I checked the A/C relay in my service shop and checked the "HVAC" fuse
    > (only fuse for AC). I disconnected the connector from the compressor
    > clutch
    > and checked for voltage with engine running and A/C on "MAX". No voltage.


    This may not help, but I did an A/C recharge on my Grandparents '97 Chevy
    Lumina with the 3.1L V6 a while back. After the system was fully charged, I
    turned on the A/C, and found the compressor clutch was not on. I looked all
    over the car for the reason, yet didn't find one. Finally, I realized what I
    had done. In taking off the air boot (to gain access to the re-fill port for
    the A/C) I had unplugged 2 sensors. After I plugged those sensors back in,
    the A/C clutch and the system it self worked perfect. Ice cold.

    Like I said, this may not help, but make sure the car is all hooked back up
    after you are done.



Similar Threads

  1. Defeat ABS Brakes on 94 Chev. Lumina Sedan
    By Brad in forum alt.autos.gm
    Replies: 5
    Last Post: 09-12-2006, 01:16 AM
  2. Replies: 0
    Last Post: 09-12-2006, 01:12 AM
  3. A/C No Longer Works in 94 Chev. Lumina Sedan
    By Brad in forum alt.autos.gm
    Replies: 1
    Last Post: 09-12-2006, 01:09 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •