2014 Peterbilt 579 Coolant Capacity & Type
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The 2014 Peterbilt 579 holds approximately 13 gallons (49.2 liters) of coolant, depending on the engine and sleeper configuration.
Quick Answer
- Total Cooling System Capacity: 12-14 gallons (45.4-53 liters); 13 gallons (49.2 liters) is a common average.
- OEM Coolant Specification: Peterbilt Extended Life Coolant (ELC) which is a Nitrite-Free Organic Acid Technology (OAT) coolant. It is typically red or orange. It must meet the Cummins CES 14603 specification.
- Mix Ratio: 50/50 mix of coolant concentrate and distilled water.
Capacity by Engine Option
| Engine | Capacity (Gallons) | Capacity (Liters) |
|---|---|---|
| PACCAR MX-13 | 12-14 | 45.4-53 |
| Cummins ISX15 | 12-14 | 45.4-53 |
Flush Interval
- Normal Duty: 600,000 miles (965,606 km) or 12,000 hours.
- Severe Duty: 300,000 miles (482,803 km) or 6,000 hours.
How to Refill & Bleed
- With the engine off and cool, slowly remove the pressure cap on the surge tank.
- Open the petcock on the bottom of the radiator to drain the old coolant.
- Close the petcock and refill the system with a 50/50 mix of Peterbilt ELC OAT coolant and distilled water.
- Leave the pressure cap off and start the engine. Let it run with the heat on high until it reaches operating temperature. This will bleed the air out of the system.
- Top off the coolant level in the surge tank as needed.
Common Cooling System Issues
- EGR Cooler Failure: The EGR cooler is a known weak point on this generation of Peterbilt 579s. It can crack internally, allowing coolant to leak into the exhaust.
- Radiator Leaks: The aluminum radiator can develop leaks over time, especially at the seams and tanks.
- Water Pump Failure: The water pump shaft seal can fail, causing a coolant leak.
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More specs for the 2014 Peterbilt 579
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2014 Peterbilt 579 Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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