Cummins 2003–2007 Dodge Ram 5.9L Cummins Stock Replacement Grid Heater (3969987)
Description
Hard cold starts, excessive white smoke during startup, or a failed factory intake heater can make winter operation miserable on your 2003–2007 Dodge Ram 5.9L Cummins.
The Cummins 3969987 Stock Replacement Grid Heater is a genuine factory replacement designed to restore the original intake-air heating system on the 5.9L Common Rail Cummins.
The grid heater warms incoming intake air during cold-start conditions, helping the engine achieve more reliable combustion when ambient temperatures drop. Rather than changing the intake system or eliminating cold-weather starting capability, this replacement allows you to restore the truck's factory-style grid heater operation.
For daily-driven trucks, tow rigs, work trucks, and Cummins-powered vehicles that regularly operate in colder climates, retaining a properly functioning grid heater can make a significant difference in cold-start performance.
Features
- Genuine Cummins replacement component
- Cummins Part Number: 3969987
- Fits 2003–2007 Dodge Ram 5.9L Cummins
- Direct replacement for the factory grid heater
- Restores factory-style intake-air heating
- Helps improve cold-weather starting
- Helps promote cleaner combustion during cold starts
- Factory-style fitment
- Uses the factory electrical system and connections
- Excellent replacement for a failed or damaged original grid heater
- Ideal for daily drivers, tow rigs, work trucks, and cold-climate applications
What Does the Grid Heater Do?
Diesel engines rely on heat generated through compression to ignite the fuel mixture.
When outside temperatures drop, the incoming air is considerably colder and achieving the temperature necessary for clean combustion during startup becomes more difficult.
The factory grid heater helps solve this problem by heating the incoming intake air before it enters the engine.
A properly functioning grid heater can help provide:
- Easier cold-weather starting
- Reduced cranking time
- More stable initial combustion
- Reduced white smoke during cold starts
- Less strain on the batteries and starter during difficult cold starts
If your truck still sees freezing temperatures, restoring the factory heater can be a much better solution than simply eliminating it.
Stock Replacement Solution
Not every Cummins needs a grid heater delete.
For daily-driven trucks, tow vehicles, work trucks, and trucks operating in colder climates, maintaining factory intake-air heating can be extremely valuable.
The Cummins 3969987 is designed as a direct factory replacement for the original heater, making it an excellent choice when the existing grid heater has failed, become damaged, or was previously removed and you want to restore the factory system.
Don't Forget the Gaskets
Installation of the 3969987 Grid Heater requires TWO Cummins 3969988 Grid Heater / Intake Manifold Gaskets.
The 3969988 is the updated semi-metallic factory gasket designed to provide proper grid heater grounding, making the correct gaskets an important part of the installation—not something we'd recommend skipping or replacing with whatever happens to be lying around the shop.
Two gaskets are required for installation and should be ordered with the grid heater if you do not already have new gaskets.
Glacier Tech Tip
If you're replacing the grid heater because of cold-start problems, don't automatically assume the heater itself is the only possible problem.
Inspect the complete system, including:
- Grid heater
- Grid heater relays
- Electrical connections
- Battery condition
- Battery cables
- Grounds
- Charging system
The grid heater is a high-current electrical component, so poor connections or other electrical problems can affect operation even when the heater itself is functional.
Applications
Designed for:
- 2003 Dodge Ram 2500 & 3500 5.9L Cummins
- 2004 Dodge Ram 2500 & 3500 5.9L Cummins
- 2005 Dodge Ram 2500 & 3500 5.9L Cummins
- 2006 Dodge Ram 2500 & 3500 5.9L Cummins
- 2007 Dodge Ram 2500 & 3500 5.9L Cummins
Important Notes
- Cummins Part Number: 3969987
- Genuine Cummins factory replacement grid heater.
- Fits 2003–2007 Dodge Ram 5.9L Cummins applications.
- Designed to restore factory-style intake-air heating.
- Installation requires TWO Cummins 3969988 gaskets.
- Gaskets are not included unless specifically stated otherwise.
- Inspect the grid heater electrical connections, relays, cables, and grounds during installation.
- Disconnect the batteries before servicing the grid heater or its electrical connections.
Complete Your Repair
Consider pairing with:
- Cummins 3969988 Grid Heater / Intake Manifold Gasket – Qty. 2 Required
- Glacier Diesel Power 2003–2007 Air-Boss CR Intake Plenum
- Glacier Diesel Power 2003–2007 Power-Flo Intake Manifold
- Replacement grid heater relays
- Intake manifold hardware
Cummins 2003–2007 Dodge Ram 5.9L Cummins Stock Replacement Grid Heater (3969987)
Description
Hard cold starts, excessive white smoke during startup, or a failed factory intake heater can make winter operation miserable on your 2003–2007 Dodge Ram 5.9L Cummins.
The Cummins 3969987 Stock Replacement Grid Heater is a genuine factory replacement designed to restore the original intake-air heating system on the 5.9L Common Rail Cummins.
The grid heater warms incoming intake air during cold-start conditions, helping the engine achieve more reliable combustion when ambient temperatures drop. Rather than changing the intake system or eliminating cold-weather starting capability, this replacement allows you to restore the truck's factory-style grid heater operation.
For daily-driven trucks, tow rigs, work trucks, and Cummins-powered vehicles that regularly operate in colder climates, retaining a properly functioning grid heater can make a significant difference in cold-start performance.
Features
- Genuine Cummins replacement component
- Cummins Part Number: 3969987
- Fits 2003–2007 Dodge Ram 5.9L Cummins
- Direct replacement for the factory grid heater
- Restores factory-style intake-air heating
- Helps improve cold-weather starting
- Helps promote cleaner combustion during cold starts
- Factory-style fitment
- Uses the factory electrical system and connections
- Excellent replacement for a failed or damaged original grid heater
- Ideal for daily drivers, tow rigs, work trucks, and cold-climate applications
What Does the Grid Heater Do?
Diesel engines rely on heat generated through compression to ignite the fuel mixture.
When outside temperatures drop, the incoming air is considerably colder and achieving the temperature necessary for clean combustion during startup becomes more difficult.
The factory grid heater helps solve this problem by heating the incoming intake air before it enters the engine.
A properly functioning grid heater can help provide:
- Easier cold-weather starting
- Reduced cranking time
- More stable initial combustion
- Reduced white smoke during cold starts
- Less strain on the batteries and starter during difficult cold starts
If your truck still sees freezing temperatures, restoring the factory heater can be a much better solution than simply eliminating it.
Stock Replacement Solution
Not every Cummins needs a grid heater delete.
For daily-driven trucks, tow vehicles, work trucks, and trucks operating in colder climates, maintaining factory intake-air heating can be extremely valuable.
The Cummins 3969987 is designed as a direct factory replacement for the original heater, making it an excellent choice when the existing grid heater has failed, become damaged, or was previously removed and you want to restore the factory system.
Don't Forget the Gaskets
Installation of the 3969987 Grid Heater requires TWO Cummins 3969988 Grid Heater / Intake Manifold Gaskets.
The 3969988 is the updated semi-metallic factory gasket designed to provide proper grid heater grounding, making the correct gaskets an important part of the installation—not something we'd recommend skipping or replacing with whatever happens to be lying around the shop.
Two gaskets are required for installation and should be ordered with the grid heater if you do not already have new gaskets.
Glacier Tech Tip
If you're replacing the grid heater because of cold-start problems, don't automatically assume the heater itself is the only possible problem.
Inspect the complete system, including:
- Grid heater
- Grid heater relays
- Electrical connections
- Battery condition
- Battery cables
- Grounds
- Charging system
The grid heater is a high-current electrical component, so poor connections or other electrical problems can affect operation even when the heater itself is functional.
Applications
Designed for:
- 2003 Dodge Ram 2500 & 3500 5.9L Cummins
- 2004 Dodge Ram 2500 & 3500 5.9L Cummins
- 2005 Dodge Ram 2500 & 3500 5.9L Cummins
- 2006 Dodge Ram 2500 & 3500 5.9L Cummins
- 2007 Dodge Ram 2500 & 3500 5.9L Cummins
Important Notes
- Cummins Part Number: 3969987
- Genuine Cummins factory replacement grid heater.
- Fits 2003–2007 Dodge Ram 5.9L Cummins applications.
- Designed to restore factory-style intake-air heating.
- Installation requires TWO Cummins 3969988 gaskets.
- Gaskets are not included unless specifically stated otherwise.
- Inspect the grid heater electrical connections, relays, cables, and grounds during installation.
- Disconnect the batteries before servicing the grid heater or its electrical connections.
Complete Your Repair
Consider pairing with:
- Cummins 3969988 Grid Heater / Intake Manifold Gasket – Qty. 2 Required
- Glacier Diesel Power 2003–2007 Air-Boss CR Intake Plenum
- Glacier Diesel Power 2003–2007 Power-Flo Intake Manifold
- Replacement grid heater relays
- Intake manifold hardware