1. Overview
The Zerostart 3100006 Engine Block Heater is designed to provide direct heat to your vehicle's engine coolant or engine block. This process ensures quicker engine starts in cold weather conditions and helps reduce engine wear by pre-warming critical components. This model is compatible with specific Acura, Cadillac, Honda, and Saab vehicles. Refer to the Zerostart catalog for precise application details for your vehicle.

Figure 1: Zerostart 3100006 Engine Block Heater components, including the heater element, power cord, and plug protector.
2. Safety Information
Read and understand all safety instructions before installing or operating this product. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Electrical Hazard: Always disconnect power before installation or maintenance. Ensure the heater is connected to a properly grounded 120 Volt, 15 Amp circuit. Do not use extension cords unless absolutely necessary and ensure they are rated for outdoor use and the heater's wattage.
- Professional Installation Recommended: Installation of engine block heaters can be complex and may require draining and refilling engine coolant. It is recommended that installation be performed by a qualified automotive technician.
- Hot Surfaces: The heater element and surrounding engine components will become hot during operation. Avoid contact with hot surfaces to prevent burns.
- Coolant System: Ensure the engine's cooling system is properly filled and free of leaks after installation. Operating the heater with insufficient coolant can cause damage.
- Cord Protection: Route the power cord away from moving parts, hot engine components, and sharp edges. Use the provided plug protector when the cord is not in use.
- Proposition 65 Warning: This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.
3. Package Contents
Verify that all items are present in the package:
- Zerostart 3100006 Engine Block Heater Element
- 5' (1.52m) Power Cord
- Plug Protector

Figure 2: Detail of the power cord connector, designed for secure attachment to the heater element.
4. Installation Instructions
Installation procedures vary significantly by vehicle make and model. Always consult your vehicle's service manual for specific instructions regarding engine block heater installation. The following are general steps and considerations:
- Prepare Vehicle: Ensure the engine is cool. Disconnect the vehicle's battery to prevent accidental electrical shorts.
- Locate Drain Plug: Identify the engine block's core plug or freeze plug where the heater will be installed. This model is designed for a 28mm threaded opening.
- Drain Coolant: Partially or fully drain the engine coolant as required by your vehicle's service manual to prevent spillage during plug removal.
- Remove Plug: Carefully remove the existing engine block plug. A 24mm socket may be required for removal, depending on the vehicle's existing plug.
- Install Heater: Insert the Zerostart 3100006 heater element into the prepared opening. Ensure it is seated correctly and tighten it according to your vehicle's specifications. Do not overtighten.
- Refill Coolant: Refill the engine's cooling system with the appropriate coolant mixture to the manufacturer's recommended level. Bleed any air from the system as per the vehicle service manual.
- Connect Power Cord: Securely attach the provided 5' (1.52m) power cord to the heater element. Ensure a tight connection. Route the cord safely away from moving parts and hot surfaces, securing it with cable ties if necessary.
- Final Checks: Reconnect the vehicle battery. Inspect for any coolant leaks.

Figure 3: The threaded heater element, ready for installation into the engine block.

Figure 4: A different angle of the heater element, showing its robust construction.
5. Operating Instructions
Once installed, operating the Zerostart 3100006 Engine Block Heater is straightforward:
- Connect to Power: Plug the power cord into a standard, grounded 120 Volt AC electrical outlet. Ensure the outlet is protected by a 15 Amp circuit breaker.
- Heating Cycle: The heater will begin to warm the engine coolant. The duration required for optimal pre-heating depends on ambient temperature and engine size, typically 2-4 hours before starting the vehicle in very cold conditions.
- Disconnect: Before starting the vehicle or driving, always disconnect the power cord from the electrical outlet and the heater. Place the plug protector over the heater's electrical connection point to prevent moisture and debris ingress.
Note: Do not operate the vehicle with the heater connected to an external power source.
6. Maintenance
Regular maintenance ensures the longevity and safe operation of your engine block heater:
- Cord Inspection: Periodically inspect the power cord for any signs of damage, fraying, cuts, or exposed wires. Replace damaged cords immediately.
- Plug Protector: Always use the provided plug protector when the heater is not connected to an electrical outlet to shield the electrical contacts from moisture and corrosion.
- Coolant Level: Regularly check your vehicle's engine coolant level, especially during cold weather operation. Ensure it is at the manufacturer's recommended level.
- Connection Integrity: Occasionally check the connection between the power cord and the heater element to ensure it remains secure.
7. Troubleshooting
If you encounter issues with your Zerostart 3100006 Engine Block Heater, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Heater not warming the engine. | No power to the heater; faulty heater element; improper installation. |
|
| Power cord or plug gets hot. | Loose connection; damaged cord; overloaded circuit. |
|
| Coolant leak after installation. | Improperly seated heater; damaged O-ring/seal; insufficient tightening. |
|
If the problem persists after attempting these solutions, contact Zerostart customer support or a qualified automotive technician.
8. Specifications
| Model Number | 3100006 |
| Brand | Zerostart |
| Voltage | 120 Volts |
| Wattage | 400 Watts |
| Thread Size | 28mm |
| Power Cord Length | 5 feet (1.52 meters) |
| Plug Type | 120 Volt, 15 Amp (Type A) |
| Certifications | CSA Approved |
| Item Weight | 10.2 ounces |
| Product Dimensions | 6.61 x 4.8 x 2.13 inches |
9. Warranty and Support
For warranty information, technical support, or assistance with your Zerostart 3100006 Engine Block Heater, please contact Zerostart customer service. Keep your purchase receipt as proof of purchase.
Contact information can typically be found on the official Zerostart website or product packaging.