Suburban rear A/C expansion valve location?

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1badgmc

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Where is the expansion valve located? Is it inside the truck behind the trim with the blower motor?
 

Sierra

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I don't think anyone knows. I have a suburban but I didn't know there was another expansion valve besides the one up front. My a/c doesn't work so I haven't got that far into the system yet.
 

DRAGGIN95

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Service and Repair THERMAL EXPANSION VALVE REPLACEMENT (AUXILIARY)-MANUAL HVAC

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.


  1. Disconnect the negative battery cable.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging See: Refrigerant\Service and Repair
  3. Remove the evaporator core.
  4. Complete the following steps in order to remove the TXV from the evaporator core:
    • Remove the clip retaining the capillary tube to the suction pipe.
    • Remove the TXV from the evaporator inlet pipe.
INSTALLATION PROCEDURE

  1. Install the TXV to the evaporator core by completing the following steps:
    • Install the TXV to the evaporator core inlet pipe.
    • Install the capillary tube to the suction line.
    • Install the capillary tube to the retaining clip.
  1. Install the evaporator core.
  2. Charge the system. Refer to Evaporator Core Replacement See: Evaporator Core\Service and Repair
  3. Connect the negative battery cable.
 

1badgmc

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I don't think anyone knows. I have a suburban but I didn't know there was another expansion valve besides the one up front. My a/c doesn't work so I haven't got that far into the system yet.



I put a new compressor, dryer, orifice tube and seals on it yesterday. The damn thing didn't even have an orifice tube in it when I took it apart! I had a friend helping me with it and we both thought there was supposed to be a second orifice tube for the rear, but there wasn't one in the kit we used. There was this odd-looking mystery part, though, which turns out to be the expansion valve, which, obviously, does the orifice tube's function for the rear. I can't see it from underneath the truck anywhere, so it must be inside. I guess I'll have to pull the panels off the inside and take a look. I need to get this thing on so I can go get the sucker charged up and finally have some air in it.
 

DRAGGIN95

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Expansion (Orifice) Tube Replacement - Auxiliary (C69)
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REMOVAL PROCEDURE


  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging See: Refrigerant\Service and Repair
  2. Disconnect the evaporator tube from the evaporator.
  3. Remove the O-ring seal.
  4. Disconnect the evaporator tube from the condenser.
  5. Remove the O-ring seal.
  6. Disconnect the evaporator tube from the auxiliary evaporator hose.
  7. Remove the O-ring seal.
  8. Remove the evaporator tube.
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INSTALLATION PROCEDURE


  1. Install the evaporator tube.
  2. Coat the new O-ring seal with 525 viscosity refrigerant oil.
  3. Install the new O-ring seal.
NOTE : Refer to Fastener Notice in Cautions and Notices.


  1. Connect the evaporator tube to the auxiliary evaporator hose.
Tighten
Tighten the evaporator tube to 24 N.m (18 lb ft) .


  1. Coat the new O-ring seal with 525 viscosity refrigerant oil.
  2. Install the new O-ring seal.
  3. Connect the evaporator tube to the condenser.
Tighten
Tighten the evaporator tube to 24 N.m (18 lb ft) .


  1. Coat the new O-ring seal with 525 viscosity refrigerant oil.
  2. Install the new O-ring seal.
  3. Connect the evaporator tube to the evaporator.
Tighten
Tighten the evaporator tube to 24 N.m (18 lb ft) .


  1. Charge the system. Refer to Refrigerant Recovery and Recharging See: Refrigerant\Service and Repair
  2. Inspect the system for leaks. Refer to Leak Testing . See: Testing and Inspection






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