If you own a 1972 Chevy truck and are looking for a heater wiring diagram, you’ve come to the right place! In this article, we’ll provide you with everything you need to know to ensure that your Chevy truck’s heater is running smoothly.
Overview of the Chevy Truck Heater Wiring Diagram
The heater wiring diagram for a 1972 Chevy truck is relatively simple. The heater circuit includes a blower motor, a heater switch, a resistor, and a fuse. The blower motor is responsible for blowing air into the cab, while the heater switch controls the temperature of the air. The resistor controls the speed of the blower motor, and the fuse protects the circuit from electrical overload.
In the following sections, we’ll go into more detail about each component of the heater wiring diagram and how they work together to heat your Chevy truck.
Blower Motor
The blower motor is responsible for blowing air into the cab of your Chevy truck. It is powered by electricity and is controlled by the heater switch. The blower motor has several speeds, which are controlled by the resistor.
If you notice that the air coming out of your heater is weak or not as warm as it should be, it may be due to a faulty blower motor. You can test the blower motor by using a multimeter to measure the resistance of the motor. If the resistance is too high or too low, it may need to be replaced.
How to Replace the Blower Motor
If you need to replace the blower motor in your 1972 Chevy truck, follow these steps:
- Disconnect the negative battery cable.
- Disconnect the wires from the blower motor.
- Remove the screws that hold the blower motor in place.
- Remove the blower motor from the truck.
- Install the new blower motor.
- Reconnect the wires to the blower motor.
- Reconnect the negative battery cable.
Heater Switch
The heater switch controls the temperature of the air coming out of the blower motor. It has several settings, including hot, cold, and defrost. The switch is connected to the blower motor and the resistor, which control the speed of the blower motor.
If you notice that the air coming out of your heater is not as hot or cold as it should be, it may be due to a faulty heater switch. You can test the switch by using a multimeter to measure the resistance of the switch at different settings.
How to Replace the Heater Switch
If you need to replace the heater switch in your 1972 Chevy truck, follow these steps:
- Disconnect the negative battery cable.
- Remove the control panel from the dashboard.
- Disconnect the wires from the back of the heater switch.
- Remove the old heater switch.
- Install the new heater switch.
- Reconnect the wires to the back of the heater switch.
- Reinstall the control panel in the dashboard.
- Reconnect the negative battery cable.
Resistor
The resistor controls the speed of the blower motor. It is connected to the blower motor and the heater switch. The resistor has several different resistance levels, which correspond to the different speeds of the blower motor.
If you notice that the blower motor in your Chevy truck is not working at all, it may be due to a faulty resistor. You can test the resistor by using a multimeter to measure the resistance of the different levels.
How to Replace the Resistor
If you need to replace the resistor in your 1972 Chevy truck, follow these steps:
- Disconnect the negative battery cable.
- Remove the blower motor from the truck.
- Disconnect the wires from the back of the resistor.
- Remove the old resistor.
- Install the new resistor.
- Reconnect the wires to the back of the resistor.
- Reinstall the blower motor in the truck.
- Reconnect the negative battery cable.
Fuse
The fuse protects the circuit from electrical overload. It is located in the fuse box of your Chevy truck and is connected to the blower motor, the heater switch, and the resistor.
If you notice that the blower motor in your Chevy truck is not working at all, it may be due to a faulty fuse. You can test the fuse by using a multimeter to measure the resistance of the fuse. If the resistance is too high or too low, it may need to be replaced.
How to Replace the Fuse
If you need to replace the fuse in your 1972 Chevy truck, follow these steps:
- Locate the fuse box in your truck.
- Find the fuse that corresponds to the heater circuit.
- Remove the old fuse.
- Install the new fuse.
FAQ
What should I do if the air coming out of my heater is weak?
If the air coming out of your heater is weak, it may be due to a faulty blower motor or a clogged air filter. You should check the blower motor first by measuring the resistance with a multimeter. If the blower motor is fine, then you should check the air filter and replace it if necessary.
What should I do if the air coming out of my heater is not hot enough?
If the air coming out of your heater is not hot enough, it may be due to a faulty heater switch or a low coolant level in your Chevy truck. You should check the heater switch first by measuring the resistance with a multimeter. If the heater switch is fine, then you should check the coolant level and refill it if necessary.
What should I do if the blower motor in my Chevy truck is not working at all?
If the blower motor in your Chevy truck is not working at all, it may be due to a faulty resistor or a blown fuse. You should check the resistor first by measuring the resistance of the different levels with a multimeter. If the resistor is fine, then you should check the fuse and replace it if necessary.
| Component | Function |
|---|---|
| Blower Motor | Blows air into the cab of the truck |
| Heater Switch | Controls the temperature of the air |
| Resistor | Controls the speed of the blower motor |
| Fuse | Protects the circuit from electrical overload |
