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Home/Chevrolet/Silverado 3500/Chevrolet Silverado 3500 (2002-2006)/Repair manual/Automatic HVAC System/Heating, Ventilation and Air Conditioning: Specifications
Contents Wiring diagrams Section: Automatic HVAC System All sections

Heating, Ventilation and Air Conditioning: Specifications Chevrolet Silverado 3500

Automatic HVAC System ~291 words

Fastener Tightening Specifications

ApplicationSpecification
MetricEnglish
A/C High Pressure Recirculation Switch6 N.m53 lb in
A/C Low Pressure Switch6 N.m53 lb in
A/C Refrigerant Filter Retaining Nuts15 N.m11 lb ft
Accumulator Bracket Nut9 N.m80 lb in
Accumulator Clamp Bolt10 N.m88 lb in
Air Distribution Duct Screws1.6 N.m14 lb in
Air Outlet Mounting Screw1.6 N.m14 lb in
Blower Motor Insulating Cover Screw1.6 N.m14 lb in
Blower Motor Relay/Resistor Screw1.6 N.m14 lb in
Compressor Bracket Mounting Bolts50 N.m37 lb ft
Compressor Clutch Coil Connector Retaining Bracket Screw9 N.m80 lb in
Compressor Clutch Plate Retaining Bolt18 N.m13 lb ft
Compressor Discharge Hose Nut at Connector16 N.m12 lb ft
Compressor Hose Bolt at Compressor (L18 Harrison)34 N.m25 lb ft
Compressor Hose Bolt at Compressor (L35 Harrison)34 N.m25 lb ft
Compressor Hose Bolt at Compressor (LB7 Harrison)34 N.m25 lb ft
Compressor Mounting Bolts (L18 Harrison)50 N.m37 lb ft
Compressor Mounting Bolts (L35 Harrison)50 N.m37 lb ft
Compressor Mounting Bolts (LB7 Harrison)50 N.m37 lb ft
Compressor Mounting Bolts (LB7 Denso)50 N.m37 lb ft
Compressor Mounting Bolts (LR4, LM7, LQ4 Denso)50 N.m37 lb ft
Compressor Suction/Discharge Hose Bolt34 N.m25 lb ft
Compressor Suction Hose Nut at Accumulator16 N.m12 lb ft
Compressor Suction Hose to Accumulator41 N.m30 lb ft
Condenser Upper Insulator Retainer Bolts2.4 N.m21 lb in
Discharge Hose Mounting Bolt (LB7 Denso)16 N.m12 lb ft
Discharge Hose Mounting Bolt (LR4, LM7, LQ4 Denso)16 N.m12 lb ft
Evaporator Tube Fitting at Orifice25 N.m18 lb ft
Evaporator Tube Nut at Condenser16 N.m12 lb ft
Evaporator Tube Nut at Evaporator16 N.m12 lb ft
Filter Access Door Screw1.6 N.m14 lb in
Floor Air Outlet Duct Screw1.6 N.m14 lb in
Heater Core Cover Screws1.6 N.m14 lb in
Heater Hose Mounting Bolt (L35)25 N.m18 lb ft
Heater Hose Outlet Mounting Nut and Bolt25 N.m18 lb ft
Heater/Ventilation Module Mounting Nuts9 N.m80 lb in
Heater/Ventilation Module Mounting Screws4 N.m35 lb in
Heater Ventilation Module Screws1.6 N.m14 lb in
Insulator Retainers and Bolts2.4 N.m21 lb in
Pressure Relief Valve9 N.m80 lb in
Suction Hose Mounting Bolt (LB7 Denso)16 N.m12 lb ft
Suction Hose Mounting Bolt (LR4, LM7, LQ4 Denso)16 N.m12 lb ft

Fastener Tightening Specifications

Refrigerant System Capacities

ApplicationSpecification
MetricEnglish
PAG Oil GM P/N 12378526 for United States PAG Oil GM P/N 88900060 for Canada
Accumulator ReplacementMl*Oz*
*Add 60 ml (2 oz) of PAG oil, plus the equal amount of oil drained from the accumulator.
Compressor Replacement60 ml2 oz
The Denso replacement compressor is precharged with 237 ml (8.0 oz) of PAG oil.
Condenser Replacement30 ml1 oz
Evaporator Replacement90 ml3 oz
If more than the specified amount of PAG oil was drained from a component, add the equal amount drained.
Total System PAG Oil Capacity210 ml7.1 oz
R-134a
Refrigerant Charge0.7 kg1.6 lb

Refrigerant System Capacities

The Heating, Ventilation and Air Conditioning (HVAC) system is divided into three 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 following procedures

  1. «Diagnostic System Check - HVAC Systems - Manual»(ref-184158-S09563417972005082200000) in HVAC Systems-Manual
  2. «Diagnostic System Check - HVAC Systems - Automatic»(ref-184159-S35370100952005082200000) in HVAC Systems-Automatic

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-184158-S07906456192005082200000) in HVAC Systems-Manual
  2. «Air Temperature Description and Operation»(ref-184158-S32464618992005082200000) in HVAC Systems-Manual
  3. «Air Delivery Description and Operation»(ref-184159-S26680613502005082200000) in HVAC Systems-Automatic
  4. «Air Temperature Description and Operation»(ref-184159-S36861041392005082200000) in HVAC Systems-Automatic

The Air Delivery Description and Operation contains the following topics

  1. Air Speed
  2. Air Distribution

The Air Temperature Description and Operation contains the following topics

  1. Heater Mode
  2. A/C Mode
  3. A/C Cycle

See also:
• Oil Leak Diagnosis

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