Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSAAB19879000 L4-1985CC 2.0L DOHCREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGDESCRIPTION AND OPERATIONCONTROL MODULE AND COMPONENTS
1987 Saab 9000 L4-1985cc 2.0L DOHC
Control Module and Components
1987 Saab 9000 L4-1985cc 2.0L DOHCSECTION Control Module and Components
ACC Control Module And Connected Components
Cars equipped with ACC are different from cars equipped with A/C in that a number of sensors and actuator motors and an electronic control module have been added to the heating and ventilation system.
ACC generation 1. Registers solar intensity from the solar sensor and temperature readings from the outside air and cabin air as well as the mixed air (in heater housing). A number of diagnostic trouble codes can be read on the ACC panel display.
With the AUTO feature engaged, it is sufficient for the driver to give the desired cabin temperature between 17 - 27 °C (62.5 - 80.5 °F) and the allow the ACC system to achieve and maintain the desired temperature in the car.
The system can also be manually controlled.
The ACC unit monitors temperature signals and signals from the solar sensor and controls the positions of the various dampers and the speed of the system and rear door fans in order to maintain the desired temperature in the car.
All sensors and control mechanisms are used by the ACC control module in order to maintain a comfortable temperature by:
^ Providing a reliable and comfortable temperature as soon as possible after the car is first started.
^ Predicting changes due to varying conditions and carrying out the necessary adaptation as quickly and quietly as possible.
As electronics in general have developed quickly over the years, there have also been changes in the ACC control module. The software has been developed in order to achieve faster and more effective control of the temperature in the cabin.
Cars equipped with ACC are different from cars equipped with A/C in that a number of sensors and actuator motors and an electronic control module have been added to the heating and ventilation system.
ACC generation 1. Registers solar intensity from the solar sensor and temperature readings from the outside air and cabin air as well as the mixed air (in heater housing). A number of diagnostic trouble codes can be read on the ACC panel display.
With the AUTO feature engaged, it is sufficient for the driver to give the desired cabin temperature between 17 - 27 °C (62.5 - 80.5 °F) and the allow the ACC system to achieve and maintain the desired temperature in the car.
The system can also be manually controlled.
The ACC unit monitors temperature signals and signals from the solar sensor and controls the positions of the various dampers and the speed of the system and rear door fans in order to maintain the desired temperature in the car.
All sensors and control mechanisms are used by the ACC control module in order to maintain a comfortable temperature by:
^ Providing a reliable and comfortable temperature as soon as possible after the car is first started.
^ Predicting changes due to varying conditions and carrying out the necessary adaptation as quickly and quietly as possible.
As electronics in general have developed quickly over the years, there have also been changes in the ACC control module. The software has been developed in order to achieve faster and more effective control of the temperature in the cabin.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.