420SEL W126 V8-4.2L M116 (1986): Heating and Air Conditioning

Also for this vehicle: 400E (124.034) V8-4.2L (119.975) (1992), 400SEL (140.043) V8-4.2L (119.971) (1993).

Diagnostics Maintenance Engine Transmission Brakes Electrical Steering & suspension Heating & A/C Body & interior

Choose Sections to see everything in a chapter, or a chapter title to start at its first page.

01Relays and Modules Relays and Modules: Sections
02Sensors and Switches Sensors and Switches: Sections
03Maintenance Maintenance: Sections
04Engine, Cooling and Exhaust Engine, Cooling and Exhaust: Sections
05Powertrain Management Powertrain Management: Sections
06Transmission and Drivetrain Transmission and Drivetrain: Sections
07Brakes and Traction Control Brakes and Traction Control: Sections
08Starting and Charging Starting and Charging: Sections
09Power and Ground Distribution Power and Ground Distribution: Sections
10Steering and Suspension Steering and Suspension: Sections
11Heating and Air Conditioning Heating and Air Conditioning: Sections
- Air Conditioning Switch › Component Information › Testing and Inspection2
- Air Door, HVAC15 pages
  - Air Door Actuator / Motor, HVAC › Component Information › Locations › Vacuum Element For Center Nozzle Flap2 3 4 5
  - Air Door Cable, HVAC › Component Information › Service and Repair › Bowden Cable For Fresh Air on Left From Plug Connection2 3 4
  - Air Door Position Sensor / Switch, HVAC › Component Information › Specifications
  - Air Door Vacuum Solenoid Valve, HVAC › Component Information5 pages
    Locations2
    Service and Repair › Switchover Valve Unit (Y7), Removal and Installation2 3
- Air Register › Component Information17 pages
  - Locations
  - Service and Repair › Cover at Fresh Air Inlet2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
- Ambient Temperature Sensor / Switch HVAC › Component Information › Specifications2 3 4 5
- Aspirator, HVAC › Component Information3 pages
  - Technical Service Bulletins › In Car Temperature Slowly Fluctuates Up and Down
  - Locations › Aspirator, HVAC2
- Auxiliary Water Pump › Component Information3 pages
  - Specifications
  - Locations › Coolant Pump2
- Blower Motor › Component Information26 pages
  - Technical Service Bulletins16 pages
    All Technical Service Bulletins for Blower Motor:8 pages
    DDAF83_00-U-1000AG › Apr › 97 › Aspirator Blower for Temperature Sensor is Noisy2
    83_035 › May › 91 › A/C - Blower Motor Warranty Returns
    54_013 › Mar › 87 › Campaign - ACC Blower Motor Fuse Changed2 3 4 5
    Recalls: › 54_013 › Mar › 87 › Campaign - ACC Blower Motor Fuse Changed2 3 4 5
    All Other Service Bulletins for Blower Motor:3 pages
    DDAF83_00-U-1000AG › Apr › 97 › Aspirator Blower for Temperature Sensor is Noisy2
    83_035 › May › 91 › A/C - Blower Motor Warranty Returns
  - Locations › Component Locations2
  - Diagrams › Diagram Information and Instructions2 3 4 5 6 7 8
- Blower Motor Resistor › Component Information › Diagrams › Diagram Information and Instructions2 3 4 5 6 7 8
- Cabin Temperature Sensor / Switch › Component Information › Specifications2 3 4 5 6 7 8
- Compressor HVAC › Compressor Clutch › Component Information24 pages
  - Technical Service Bulletins › A/C - Remanufactured Compressors/Clutches Availability2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
  - Diagrams › Diagram Information and Instructions2 3 4 5 6 7 8
- Compressor Clutch Control, HVAC <--> [Compressor Clutch Relay] › Component Information › Diagrams › Diagram Information and Instructions2 3 4 5 6 7 8
- Compressor Speed Sensor, HVAC › Component Information › Locations2
- Condenser HVAC › Component Information › Locations2 3 4 5
- Condenser Fan › Component Information › Diagrams › Diagram Information and Instructions2 3 4 5 6 7 8
- Control Assembly, HVAC › Component Information12 pages
- Evaporator Housing <--> [Evaporator Case] › Component Information › Service and Repair2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
- Evaporator Core › Component Information › Specifications2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
- Evaporator Drain Tube › Component Information › Testing and Inspection
- Evaporator Temperature Sensor / Switch › Component Information › Description and Operation2
- Expansion Valve › Component Information › Technical Service Bulletins › A/C - Expansion Valve Replacement Special Tool
- Heater Control Valve › Component Information12 pages
  - Specifications2 3 4 5
  - Service and Repair › Remove/Install Dual Heating Water Valve2 3 4 5 6 7
- Heater Core › Component Information15 pages
  - Technical Service Bulletins › A/C - ACC Production Change2 3
  - Service and Repair › With A/C2 3 4 5 6 7 8 9 10 11 12
- Heater Box <--> [Heater Core Case] › Component Information › Service and Repair › With A/C2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20…34
- Heater Core Temperature Sensor / Switch › Component Information8 pages
  - Specifications2 3 4
  - Service and Repair › Without A/C2 3 4
- Hose/Line HVAC › Component Information › Specifications
- Receiver Dryer › Component Information › Specifications › Mechanical Specifications2
- Refrigerant › Component Information46 pages
  - Technical Service Bulletins44 pages
    All Technical Service Bulletins for Refrigerant:22 pages
    S-83_55-118 › Mar › 09 › A/C - No Or Low A/C Cooling Performance2 3 4 5 6
    P-83_00-97A › Sep › 07 › A/C - Fluorescent Dye Leak Testing
    83_081A › Aug › 94 › A/C - R12 to R134a Conversion2 3 4 5 6 7
    00_053 › Oct › 93 › Maintenance - Factory Approved Service Products2 3 4 5
    58_060 › Feb › 93 › A/C - Updated Leak Detector for R12 and R134a
    83_049 › Feb › 93 › A/C - Bear R12/R134a Leak Detector Modified
    83_037 › Jul › 91 › A/C - Warning Against Refrigerant Alaskankool R176
    Customer Interest: › S-83_55-118 › Mar › 09 › A/C - No Or Low A/C Cooling Performance2 3 4 5 6
    All Other Service Bulletins for Refrigerant:16 pages
    P-83_00-97A › Sep › 07 › A/C - Fluorescent Dye Leak Testing
    83_081A › Aug › 94 › A/C - R12 to R134a Conversion2 3 4 5 6 7
    00_053 › Oct › 93 › Maintenance - Factory Approved Service Products2 3 4 5
    58_060 › Feb › 93 › A/C - Updated Leak Detector for R12 and R134a
    83_049 › Feb › 93 › A/C - Bear R12/R134a Leak Detector Modified
    83_037 › Jul › 91 › A/C - Warning Against Refrigerant Alaskankool R176
  - Specifications › Capacity Specifications2
- Refrigerant Oil › Component Information14 pages
  - Technical Service Bulletins12 pages
    Customer Interest for Refrigerant Oil: › S-83_55-118 › Mar › 09 › A/C - No Or Low A/C Cooling Performance2 3 4 5 6
    All Technical Service Bulletins for Refrigerant Oil: › S-83_55-118 › Mar › 09 › A/C - No Or Low A/C Cooling Performance2 3 4 5 6
  - Specifications › Capacity Specifications2
- Relays and Modules - HVAC › Compressor Clutch Control, HVAC <--> [Compressor Clutch Relay] › Component Information › Diagrams › Diagram Information and Instructions2 3 4 5 6 7 8
- Sensors and Switches - HVAC31 pages
- Service Port HVAC › Component Information › Locations
- Vacuum Check Valve HVAC › Component Information › Locations
- Vacuum Reservoir HVAC › Component Information › Locations2 3
- Ventilation Switch › Component Information › Testing and Inspection › With ACC2 3
12Restraint Systems Restraint Systems: Sections
13Accessories and Optional Equipment Accessories and Optional Equipment: Sections
14Body and Frame Body and Frame: Sections
15Cruise Control Cruise Control: Sections
16Instrument Panel, Gauges and Warning Indicators Instrument Panel, Gauges and Warning Indicators: Sections
17Lighting and Horns Lighting and Horns: Sections
18Windows and Glass Windows and Glass: Sections
19Wiper and Washer Systems Wiper and Washer Systems: Sections