05 grand caravan 3.3L keeps burning up a/c clutch

Discussion in 'Domestics' started by KrazyK-nampa, Jul 16, 2017.

  1. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    Van is on #6 Murray a/c compressor (new never reman!) Keeps burning clutch this one lasted 3 miles. Van has correct charge no debris in system always put on 20 minute minimum vacuum time before charging. A/c clutch just seems to fail consistently. Anyone else come accross tjis?

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  2. kev2

    kev2 wrench

    Joined:
    Nov 14, 2006
    Messages:
    4,680
    Likes Received:
    41
    Gender:
    Male
    Have not seen repeated failure....

    I will add some thoughts,
    Air gap,
    Circuit checked - 12v DVOM (not test lamp), AMPs draw, and ground is OK , diode ?
    Nothing else on circuit from relay?
    no voltage on grd circuit
    It does cycle ? What is High ?

    Draw
    Denso 10S17 – 3.3 amps @ 12V ±
    0.5V @ 21° C (70° F)
    Denso 10S20 – 2.2 amps @ 12V ± WITH REAR AC
    0.5V @ 21° C (70° F)
    Compressor Clutch Air
    Gap
    0.35 - 0.60 mm (0.014 - 0.024 in.)
     

    Attached Files:

    Last edited: Jul 16, 2017
  3. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    Vans scheduled for monday afternoon. Will check electrical and repost. Thnx for input!!!

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  4. kev2

    kev2 wrench

    Joined:
    Nov 14, 2006
    Messages:
    4,680
    Likes Received:
    41
    Gender:
    Male
    I would like to see some colleagues opinions on 'murray' replacement parts as opposed to denso.

    Also there is this tidbit I found
     

    Attached Files:

  5. billr

    billr wrench Staff Member

    Joined:
    Mar 12, 2007
    Messages:
    5,803
    Likes Received:
    57
    Clarify: is the clutch coil burning up, going open-circuit? Or, is the clutch friction surface disappearing? Or, is the friction surface OK but the mating bare steel parts getting warped? My guess is you have a poor connection in the wiring and voltage to the coil isn't the full 12V (nominal). Check all that as already suggested.
     
  6. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    Heading out to trailer van back to shop, thankyou all for suggestions. Will update when i know more

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  7. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    Ok got it back and we are getting 13.5v @ clutch with engine running. But clutch is burned and not engaging compressor

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  8. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    Have 7 mv on ground circuit

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  9. Mobile Dan

    Mobile Dan wrench

    Joined:
    Mar 1, 2002
    Messages:
    3,185
    Likes Received:
    33
    Gender:
    Male
    Location:
    Kentucky
    By "burned" do you mean electrical failure of the coil? See reply #5, asking for a better description.
     
  10. jd

    jd Hero Member

    Joined:
    Jan 14, 2007
    Messages:
    397
    Likes Received:
    16
    Volts isn't Amps. 50PSI water to a Garden Hose is different than 50PSI to a Fire Hose. If this thing is burning CLUTCHES, I'd wire a Relay right at it. Whatever circuit is powering the Clutch now, energizes a Relay that gets its power from the Battery via a Fuse. Did this on a van years ago. Completely different vehicle, a Dodge with an aftermarket A/C using a York two-cylinder compressor. But it kept the clutch engaged and I had no trouble the rest of the time we had the van.
    [​IMG] [​IMG]

    Relay pictured has Normally Closed Terminal 87A, you wouldn't use it for this job.
     
  11. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    Friction surface disappears. Lets out a nice cloud, and makes for a pisst off customer.lol[​IMG]

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  12. Mobile Dan

    Mobile Dan wrench

    Joined:
    Mar 1, 2002
    Messages:
    3,185
    Likes Received:
    33
    Gender:
    Male
    Location:
    Kentucky
    I'm assuming that if the compressors were locking up internally, you would have mentioned it, so...JD's idea of setting up a relay to assure adequate power to maintain full clutch engagement would be something to consider.
    Another possibility would be a batch of clutches with crappy "rubber springs". But I think I see heat from slippage and if the rubber part broke, the plate would not get hot like that.
     
    Last edited: Jul 17, 2017
  13. KrazyK-nampa

    KrazyK-nampa Full Member

    Joined:
    Jul 16, 2017
    Messages:
    67
    Likes Received:
    1
    I get what jd said but im getting full voltage to clutch so dont quite understand how a relay will help

    Sent from my SAMSUNG-SGH-I747 using Tapatalk
     
  14. billr

    billr wrench Staff Member

    Joined:
    Mar 12, 2007
    Messages:
    5,803
    Likes Received:
    57
    Just for fun, how about measuring the current draw of that clutch coil? And, what is the DC resistance of it when cold?

    Can you take the clutch apart and take pictures of the damaged parts "spread out"? I'm not familiar with how that clutch is constructed, not sure what I am seeing in the picture posted.
     
  15. kev2

    kev2 wrench

    Joined:
    Nov 14, 2006
    Messages:
    4,680
    Likes Received:
    41
    Gender:
    Male
    interesting -
    You said 6 new compressors (post 1)?
    Are the clutches coming on the compressors OR are you installing them?
    What is history - customer brings in with just a bad AC clutch OR more to this.
     

Share This Page