Skip to product information
SKU:
NLT1Z03204
Ships for free in 2–4 business days.
Cummins 5.9L 6.7L 24V Intake Grid Heater 3970001 4948124
$96.99
In Stock
$96.99
Sale price
$96.99
Regular price
This 24-volt intake grid heater replaces 3970001 and 4948124 on compatible Cummins 5.9L and 6.7L diesel applications.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Cummins 4B5.9, 6B5.9, and 6BT engines specifying 3970001
- Cummins ISB6.7 and QSB6.7 BS3 applications
- 2007.5-and-newer Dodge Ram 2500, 3500, and selected 4000 models with matching 24V heater
- Freightliner FL50, FL60, FL70, FL80, FS65, MT35, MT45, MT55, and FC70 with matching Cummins engine
- Ford CF700 and F700 with matching Cummins engine
- Dodge D250, D350, W250, and W350 with matching 24V system
Product Overview
Long cranking, rough cold starts, and white smoke can appear when intake air is not being heated in low temperatures. After the batteries, relays, wiring, and control system are tested, a failed grid element may be the cause.
This is a 24-volt heater. Vehicle and equipment electrical systems vary, so voltage, dimensions, terminals, and the original number must all match.
Key Features & Performance
- Heats intake air for cold starting
- 24-volt electrical design
- High-current grid element
- Replacement for two common Cummins references
- Used on matching 4B/6B, ISB, and QSB applications
Replaces Part Numbers
- 3970001
- 4948124
Common Uses
- Repairing hard cold starts
- Replacing a burned or open grid element
- Correcting a confirmed intake-heater circuit fault
Technical Specifications
- Product Type: Intake air grid heater
- Voltage: 24V DC
- Power: Approximately 2100W where specified
- Engine Families: Cummins 5.9L and 6.7L
- Replacement Type: Aftermarket
Installation & Fitment
- Disconnect both battery banks before service
- Confirm the machine uses 24 volts
- Inspect relays, cables, terminals, and control codes
- Use correct high-current torque specifications
- Do not energize the heater loose or outside the intake
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application not shown.
Model, production date, serial number, connector, dimensions, installed options, and previous repairs can affect fitment. Compare the original component and reference information before purchase.
Frequently Asked Questions
Q: Will this fit a 12-volt pickup? A: No. This listed heater is 24 volts; installing the wrong voltage part can cause failure or unsafe operation.
Q: Will it fix white smoke on startup? A: It may if a failed grid heater is the cause, but injectors, compression, fuel quality, and temperature also matter.
Q: Should I replace the relay too? A: Test the relay and voltage drop first. A good heater will not work with a failed high-current supply.
Q: Is this heater for a 12-volt truck? A: No. The listed element is a 24-volt, 2100-watt intake heater; verify system voltage and part number before connecting it.
Q: Is this an original-equipment part? A: No. This is an aftermarket item. Brand, model, and part numbers identify fitment only; compare the original part and the listing details before ordering.
Part Summary
keywords: 3970001 Cummins grid heater, 4948124 24V intake heater, 5.9 diesel cold start repair, ISB6.7 grid element, Cummins white smoke cold start part
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, dimensions, and application before purchase.