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Home/Hummer/H3/Hummer H3 I (2005-2010)/Repair manual/Automatic HVAC System/Heating, Ventilation, and Air Conditioning: Maintenance
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Heating, Ventilation, and Air Conditioning: Maintenance Hummer H3 I

Automatic HVAC System ~585 words

Flushing Procedure

  1. Recover the refrigerant. Refer to «Refrigerant Recovery and Recharging»(ref-266877-S05995885982007100900000) .
  2. Remove the thermal expansion valve (TXV). Refer to «Thermal Expansion Valve Replacement (Left Hand Drive)»(ref-266877-S02211017182007100900000) or «Thermal Expansion Valve Replacement (Right Hand Drive)»(ref-266877-S08028884082007100900000) .
  3. Install J 45268 - 103. See «Special Tools»(ref-266877-S14514155762007100900000) .
  4. Remove the A/C compressor. Refer to «Compressor Replacement»(ref-266877-S13397626442007100900000) .
  5. Install J 45268 - 5 to the discharge hose. See «Special Tools»(ref-266877-S14514155762007100900000) .
  6. Install J 45268 - 4 to the suction hose. See «Special Tools»(ref-266877-S14514155762007100900000) .
  7. Forward flow refrigerant flushing is recommended for contaminated refrigerant or PAG oil. Perform the following procedure: IMPORTANT: The filter inside J 45268 - 1 is serviceable. See «Special Tools»(ref-266877-S14514155762007100900000) . Remove and discard the check valve from the filter. Service the filter with ACDelco P/N GF 470, before each flush. Connect J 45268 - 1 flush filter to the suction port of J 45268 - 4 flush adapter. See «Special Tools»(ref-266877-S14514155762007100900000) . Connect the blue hose from J 43600 to J 45268 - 1 flush filter adapter. See «Special Tools»(ref-266877-S14514155762007100900000) . Connect the red hose from J 43600 to J 45268 - 5 flush adapter. See «Special Tools»(ref-266877-S14514155762007100900000) .
  8. Reverse flow refrigerant flush is recommended for desiccant bag failure. Replace the receiver dehydrator when the A/C flush is complete and perform the following procedure: IMPORTANT: The filter inside J 45268 - 1 is serviceable. See «Special Tools»(ref-266877-S14514155762007100900000) . Remove and discard the check valve from the filter. Service the filter with ACDelco P/N GF 470, before each flush. Connect J 45268 - 1 flush filter to the discharge port of J 45268 - 5 flush adapter. See «Special Tools»(ref-266877-S14514155762007100900000) . Connect the blue hose from J 43600 to J 45268 - 1 flush filter adapter. See «Special Tools»(ref-266877-S14514155762007100900000) . Connect the red hose from J 43600 to the suction port of J 45268 - 4 flush adapter. See «Special Tools»(ref-266877-S14514155762007100900000) .
  9. Flush the A/C system. Follow the instructions supplied with J 43600 . See «Special Tools»(ref-266877-S14514155762007100900000) . Close the valve on the external refrigerant tank, before starting the flush process.
  10. Remove J 45268 - 4 from the suction hose. See «Special Tools»(ref-266877-S14514155762007100900000) .
  11. Remove J 45268 - 5 from the discharge hose. See «Special Tools»(ref-266877-S14514155762007100900000) .
  12. Remove J 45268 - 1 from J 43600 . See «Special Tools»(ref-266877-S14514155762007100900000) .
  13. Drain the PAG oil from the A/C compressor. Rotate the compressor input shaft to assist in draining the PAG oil from the compressor.
  14. Add the total system capacity of PAG oil to the A/C compressor. Refer to «Refrigerant System Capacities»(ref-266877-S39620084022007100900000) .
  15. Add one bottle of J 41447 directly to the A/C compressor. See «Special Tools»(ref-266877-S14514155762007100900000) .
  16. Install the A/C compressor. Refer to «Compressor Replacement»(ref-266877-S13397626442007100900000) .
  17. Remove J 45268 - 103. See «Special Tools»(ref-266877-S14514155762007100900000) .
  18. Install new seal washers. Refer to «Sealing Washer Replacement»(ref-266877-S29917442962007100900000) .
  19. Inspect the TXV for debris. Clean or replace as needed.
  20. Install the TXV. Refer to «Thermal Expansion Valve Replacement (Left Hand Drive)»(ref-266877-S02211017182007100900000) or «Thermal Expansion Valve Replacement (Right Hand Drive)»(ref-266877-S08028884082007100900000) .
  21. Evacuate and recharge the A/C system. Refer to «Refrigerant Recovery and Recharging»(ref-266877-S05995885982007100900000) .
  22. Leak test the fittings using J 42220 . See «Special Tools»(ref-266877-S14514155762007100900000) .

Draining Procedure

  1. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.
  2. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
  3. Properly discard the used refrigerant oil.

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