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Heating, Ventilation and Air Conditioning: Specifications GMC Envoy II

Automatic HVAC System ~301 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
A/C Compressor Cycling Switch5 N.m44 lb in
A/C Compressor Mounting Bolt50 N.m37 lb ft
A/C Compressor Rear Bracket Bolt25 N.m18 lb ft
A/C Evaporator and Blower Module Shield Screws2.2 N.m19 lb in
A/C Refrigerant Pressure Sensor4.8 N.m42 lb in
Accumulator Clamp Screw10 N.m88 lb in
Accumulator to Evaporator Fitting28 N.m21 lb ft
Air Distributor Duct Mounting Screw1.9 N.m17 lb in
Air Inlet Assembly Mounting Stud4.5 N.m40 lb in
Air Outlet Assembly Retaining Screw2.5 N.m22 lb in
Air Temperature Actuator Retaining Screw1.9 N.m17 lb in
Blower Assembly Mounting Nut (RPO C42)4.5 N.m40 lb in
Blower Assembly Mounting Screw (RPO C42)4.5 N.m40 lb in
Blower Assembly Mounting Stud (RPO C42)4.5 N.m40 lb in
Blower Motor Access Cover Screw (RPO C60 and C68)2.5 N.m22 lb in
Blower Motor and Fan Assembly Mounting Screw1.9 N.m17 lb in
Blower Motor Relay Bracket Mounting Screw1.9 N.m17 lb in
Blower Motor Resistor Mounting Screw1.9 N.m17 lb in
Body Harness Connector Support Bracket Mounting Nuts9.0 N.m80 lb in
Compressor Discharge Hose to Condenser Fitting28 N.m21 lb ft
Compressor Pressure Relief Valve9 N.m80 lb in
Compressor Suction/Discharge Hose to Compressor Bolt33 N.m24 lb ft
Compressor Suction Hose to Accumulator Fitting48 N.m35 lb ft
Condenser Insulator Retaining Screw1.9 N.m17 lb in
Evaporator Case Section to Blower Case Section Retaining Screw1.9 N.m17 lb in
Evaporator Tube Clip Screw1.9 N.m17 lb in
Evaporator Tube to Condenser Fitting28 N.m21 lb ft
Floor Air Outlet Mounting Screw1.9 N.m17 lb in
Heater Core Access Cover Screw1.9 N.m17 lb in
Heater Inlet and Outlet Hoses Bracket Bolt25 N.m18 lb ft
Heater Inlet Hose Fitting at Intake Manifold23.5 N.m17 lb ft
Heater Outlet Hose Bracket Bolt25 N.m18 lb ft
Heater/Vent Module Mounting Nut4.5 N.m40 lb in
Heater/Vent Module Mounting Screw4.5 N.m40 lb in
Heater/Vent Module Mounting Stud4.5 N.m40 lb in
Intermediate Bracket Bolts10 N.m88 lb in
Knee Bolster Bracket Nuts5.5 N.m49 lb in

Fastener Tightening Specifications

Refrigerant System Capacities

ApplicationSpecification
MetricEnglish
PAG Oil GM P/N 12345923 (Canadian P/N 10953486)
Accumulator Replacement60 ml*2 oz*
*Add PAG oil equal to the amount of oil drained from the old accumulator plus the specified additional amount.
Compressor Replacement60 ml 12 oz 1
A Sanden scroll compressor containing 240 ml 1 of oil is used on this model year.
Condenser Replacement30 ml 11 oz 1
Evaporator Replacement90 ml 13 oz 1
Total System Oil Capacity240 ml8 oz
R-134a
Refrigerant Charge0.86 kg1.9 lb
Refrigerant Charge with Rear A/C1.2 kg2.65 lb
1 If more than the specified amount of oil was drained from a component, add the equal amount of oil drained.

Refrigerant System Capacities

The Heating, Ventilation and Air Conditioning (HVAC) system is divided into 3 sections. The first, Heating, Ventilation and Air Conditioning, has all procedures that pertain to a HVAC component or function that are not specifically associated with an automatic or manual control system. The second, HVAC Systems - Manual, has all procedures specific to the manual control system. The third, HVAC Systems - Automatic, has all the procedures specific to the automatic control system.

For systems with DTCs, begin the system diagnosis with the Diagnostic System Check. Refer to Diagnostic System Check - Vehicle in Vehicle DTC Information.

The Diagnostic System Check will provide the following information

  1. The identification of the control modules which command the system.
  2. The ability of the control modules to communicate through the Class 2 serial data circuit.

The use of the Diagnostic System Check will identify and lead the technician to the correct diagnostic procedure.

Review the Description and Operation information to help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation information will also help you determine if the condition described by the customer is normal operation. The HVAC Description and Operation information is divided into

  1. «Air Delivery Description and Operation»(ref-200404-S36221292302005102000000) in HVAC Systems - Manual
  2. «Air Temperature Description and Operation»(ref-200404-S08565107742005102000000) in HVAC Systems - Manual
  3. «Air Delivery Description and Operation»(ref-200411-S37908782812005102000000) in HVAC Systems - Automatic
  4. «Air Temperature Description and Operation»(ref-200411-S27771675322005102000000) in HVAC Systems - Automatic

The Air Delivery Description and Operation contains the following topics

  1. HVAC control components
  2. Air speed
  3. Air distribution
  4. Recirculation operation
  5. Automatic operation

The Air Temperature Description and Operation contains the following topics

  1. HVAC control components
  2. Heating and A/C operation
  3. Automatic operation
  4. Engine coolant
  5. A/C cycle

More articles — Heating, Ventilation and Air Conditioning