BMW’s dual temp switch is an important component of the car’s cooling system. It is responsible for controlling the operation of the electric fan, which helps to keep the engine cool. The dual temp switch is a simple device that consists of two temperature sensors, each with a different set point. When the temperature rises, the switch will activate the electric fan, which will help to cool the engine. In this article, we will discuss how to wire the dual temp switch in your BMW.
What is a Dual Temp Switch?
A dual temp switch is a device that is used to control the operation of a cooling fan. It consists of two temperature sensors, each with a different set point. When the temperature rises above the first set point, the switch will activate the low-speed operation of the electric fan, and when the temperature rises above the second set point, the switch will activate the high-speed operation of the electric fan. The dual temp switch is an important component of the cooling system as it helps to maintain the proper operating temperature of the engine.
How Does the Dual Temp Switch Work?
The dual temp switch is installed in the engine coolant system and monitors the temperature of the coolant as it flows through the system. When the temperature rises above the first set point, the switch will activate the low-speed operation of the electric fan, and when the temperature rises above the second set point, the switch will activate the high-speed operation of the electric fan. The switch is designed to work with the car’s engine control module (ECM) and will send a signal to the ECM when the electric fan is activated.
Why is the Dual Temp Switch Important?
The dual temp switch is an important component of the car’s cooling system as it helps to maintain the proper operating temperature of the engine. If the engine temperature rises too high, it can cause damage to the engine components, and in some cases, can even cause the engine to fail. The electric fan is an important part of the cooling system as it provides additional cooling when the engine is under heavy load or when the car is operating in hot weather conditions.
Wiring the Dual Temp Switch in Your BMW
Wiring the dual temp switch in your BMW is a simple process, but it is important to follow the proper wiring diagram to ensure that the switch operates correctly. The following steps will guide you through the process of wiring the dual temp switch in your BMW:
Step 1: Prepare the Wiring
The first step in wiring the dual temp switch is to prepare the wiring. You will need a wiring diagram for your particular BMW model, which can be found in the car’s owner’s manual. You will also need a wiring harness, which can be purchased from a BMW parts dealer. Once you have these items, you can begin preparing the wiring by stripping the ends of the wires and crimping on the appropriate connectors.
Step 2: Locate the Dual Temp Switch
The next step is to locate the dual temp switch in your BMW. The switch is typically located in the engine coolant system and is attached to a mounting bracket. It will have two wires attached to it, which are used to activate the electric fan.
Step 3: Connect the Wiring Harness
The next step is to connect the wiring harness to the dual temp switch. The wiring harness will have two wires, which correspond to the two terminals on the switch. Connect the wires to the switch using the appropriate connectors.
Step 4: Connect the Wiring to the ECM
The final step is to connect the wiring to the car’s ECM. The ECM is the control module for the car’s engine and is responsible for controlling the operation of the electric fan. You will need to locate the appropriate wire on the ECM, which is usually located near the engine bay. Connect the wire from the switch to the appropriate wire on the ECM using the appropriate connector.
FAQ
What is the Purpose of the Dual Temp Switch?
The dual temp switch is an important component of the car’s cooling system as it helps to maintain the proper operating temperature of the engine. It activates the electric fan when the engine temperature rises above a certain set point, which helps to cool the engine and prevent damage to the engine components.
Where is the Dual Temp Switch Located in a BMW?
The dual temp switch is typically located in the engine coolant system and is attached to a mounting bracket. It will have two wires attached to it, which are used to activate the electric fan.
How Do I Wire the Dual Temp Switch in My BMW?
Wiring the dual temp switch in your BMW is a simple process, but it is important to follow the proper wiring diagram to ensure that the switch operates correctly. You will need a wiring diagram for your particular BMW model, which can be found in the car’s owner’s manual. You will also need a wiring harness, which can be purchased from a BMW parts dealer. Once you have these items, you can begin preparing the wiring by stripping the ends of the wires and crimping on the appropriate connectors. The final step is to connect the wiring to the car’s ECM.
How Does the Dual Temp Switch Work?
The dual temp switch is installed in the engine coolant system and monitors the temperature of the coolant as it flows through the system. When the temperature rises above the first set point, the switch will activate the low-speed operation of the electric fan, and when the temperature rises above the second set point, the switch will activate the high-speed operation of the electric fan. The switch is designed to work with the car’s engine control module (ECM) and will send a signal to the ECM when the electric fan is activated.
What Happens if the Dual Temp Switch Fails?
If the dual temp switch fails, it can cause the engine to overheat, which can lead to damage to the engine components and in some cases, can cause the engine to fail. It is important to have the switch replaced as soon as possible to prevent damage to the engine.
| Low-Speed Set Point | 95° C |
| High-Speed Set Point | 105° C |
| Wiring Harness Part Number | 12 51 7 510 638 |
