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No AC, A/C cycling switch ?

Discussion in 'A/C & Heater systems - HVAC' started by joeydj4u, April 21, 2008.

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    1. joeydj4u

      joeydj4u Guest

      I have a 99 Explorer Sport
      My A/C worked Last summer and this spring I just turned it on and noticed it just blows air. The compresor clutch is NOT cycling. I bought one those self charge kits, connected it to the low side it had 40-45psi, ok according to the guage.

      A/C cycling switch on the Accumulator/Drier? I noticed the commpresor clutch does not go on at all. I unpluged the connector on the A/C Cycling switch, jumped the connector and boom, the clutch on the compresor kicks in. Is it possible that the problem lies within the A/C cycling switch and or low refrigerent and NOT the A/C presure cut off switch on the Compressor itself?

      Are A/C cycling switches common to failure?

      The A/C Cycling switch contacts are supposed to open when pressure drops to 22-28 psi and close at 40-47 psi.
      Now given that on the gauge I had 40+ psi and the clutch only went on when Jumped, I suspect my cycling switch is stuck on open position and therefore not energizing the compresor clutch, Hmmm. Thoughts?

      The Cycling Switch runs $15-$25 should I just give it a whirl? It's not that expensive, I just did'nt want to start throwing parts in:confused:

      Thanks in advance to any responses.
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    3. Blee1099

      Blee1099 Evil Asian EF Vendor Moderator Emeritus

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      Whats the high pressure side reading? It may be overcharged if you charged it up recently.
    4. joeydj4u

      joeydj4u Guest

      I no longer have manifold gauges to check both sides basicly I figured since it worked well last summer it may be low, went to a local auto parts store bought the recharge kit that comes with gauge the shows where your at pressure wise on the low side I'm believe being thats where directions stated to connect the the can. I't read full so I did not proceed to charge the system. I just jumped the switch to make sure I did not have a compressor/ clutch problem.
    5. joeydj4u

      joeydj4u Guest

      OK update, I got a set of gauges hooked them up here's what I had

      70 Degrees Ambiant Temp Today

      25- 30 Low side
      140-145 Hiigh side
      65 degrees out of the vents
      The compressor started cycling litlle by little
      I replaced the A/C Cycling switch
      Recharged with 2 small cans of 134
      The compressor started cycling little by little and finally seemed to cycle at normal state as I Charged.
      Readings are now
      35 - 40 psi Low side
      145 - 150 psi Hi side
      38 - 40 degrees comming out of the center vents.

      I will drive the vehicle for a few days and see what happens:cool:
      Are my readings close to what spec should be?

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