Sierra 3500 Denali 4WD V8-6.0L (2011)
Housing Assembly HVAC: Service and Repair
Air Conditioning and Heater Module Assembly Removal and Installation
Special Tools
J 43181 Heater Line QC Release Tool
Removal Procedure
1. Drain the engine coolant. Refer to Cooling System Draining and Filling (Vac-N-Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service
and Repair)Cooling System Draining and Filling (Static Fill) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair)Cooling
System Draining and Filling (Static Fill LGH, LML) (See: Engine, Cooling and Exhaust/Cooling System/Service and Repair).
2. Using the J 43181 disconnect the inlet heater hose from the heater core.
1. Install the J 43181 to the heater core pipe.
2. Close the tool around the heater core pipe.
3. Firmly pull the tool into the quick connect end of the heater hose.
4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the inlet hose from the heater core.
3. Using the J 43181 disconnect the surge tank outlet hose from the heater core.
1. Install the J 43181 to the heater core pipe.
2. Close the tool around the heater core pipe.
3. Firmly pull the tool into the quick connect end of the heater hose.
4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the surge tank outlet hose from the heater core.
4. Remove the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement (See: Engine, Cooling and
Exhaust/Engine/Intake Manifold/Service and Repair).
5. Remove the battery. Refer to Battery Replacement (See: Starting and Charging/Battery/Service and Repair/Removal and Replacement/Battery
Replacement).
6. Remove the accumulator. Refer to Air Conditioning Accumulator Replacement (Non-HP2) (See: Accumulator HVAC/Service and Repair/Air
Conditioning Accumulator Replacement (Non-HP2))Air Conditioning Accumulator Replacement (Non-HP2 Diesel) (See: Accumulator
HVAC/Service and Repair/Air Conditioning Accumulator Replacement (Non-HP2 Diesel)).
7. Remove the instrument panel to the service position. Refer to Instrument Panel Service Positioning (without SLT) (See: Body and Frame/Interior
Moulding / Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel Service Positioning (without SLT))Instrument Panel Service
Positioning (with SLT) (See: Body and Frame/Interior Moulding / Trim/Dashboard / Instrument Panel/Service and Repair/Instrument Panel
Service Positioning (with SLT)).