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Freightliner 122Sd Exhaust Gas Recirculation (EGR) Cooler Coolant Pipes

Freightliner 122Sd Exhaust gas recirculation (egr) cooler coolant pipes

Starting at $10.95, AutoBuffy stocks 1 EGR cooler coolant pipes from Elring for the Freightliner 122Sd. This pipe circulates engine coolant through the EGR cooler to lower exhaust gas temperatures before recirculation into the intake. A failed pipe causes coolant loss, overheating, and white smoke — and can destroy the EGR cooler itself if ignored.

Signs your Freightliner 122Sd needs a new EGR cooler coolant pipe

  • White or sweet-smelling smoke from the exhaust, indicating coolant entering the combustion chamber through a cracked or leaking pipe
  • Visible coolant drips or dried residue around the EGR cooler or coolant pipe fittings
  • Unexplained coolant loss with no external puddle — coolant is being burned internally or leaking onto hot engine surfaces and evaporating
  • Engine overheating or coolant temperature gauge rising higher than normal, especially under load
  • Coolant reservoir runs low repeatedly within a short period despite no obvious external leak
  • Rough idle, misfires, or check engine light with codes related to EGR system performance or coolant temperature faults

Which EGR cooler coolant pipe should you buy for your Freightliner 122Sd?

The main decision is between OE-equivalent replacement pipes and upgraded options. Fit, material quality, and whether the pipe includes replacement seals or O-rings are the practical factors that separate a lasting repair from a repeat job.

OE-Equivalent Replacement Pipe
Best for
Drivers who want a direct, no-hassle swap
What you get
Same material, routing, and connection points as the factory pipe; designed to seal correctly without modification
Upgraded Stainless Steel Pipe
Best for
High-mileage vehicles or those prone to repeat coolant pipe failures
What you get
Corrosion-resistant construction that outlasts factory aluminum or plastic pipes in harsh thermal cycling conditions
Pipe-and-Seal Kit
Best for
Anyone doing a full EGR cooler service
What you get
Coolant pipe plus new O-rings, gaskets, or clamps bundled together — prevents leak-backs at the fittings after installation
OEM (Dealer-Sourced) Pipe
Best for
Vehicles still under warranty or where exact factory spec is required
What you get
Guaranteed fitment and materials matching original build spec, typically at a higher price point

Exhaust gas recirculation (egr) cooler coolant pipes brands we stock for your Freightliner 122Sd

Elring
1 option · from $10.95

Replacing the EGR cooler coolant pipe on a Freightliner 122Sd

Moderate⏱ 1.5–3 hoursSocket set and ratchet (metric)Screwdriver set (flathead and Phillips)Hose clamp pliers or slip-joint pliersDrain pan and coolant catch containerFlashlight or work light for tight engine bay access

Start by draining enough coolant to bring the level below the pipe, then carefully disconnect the hose clamps, banjo fittings, or threaded connections securing the pipe to the EGR cooler and engine coolant circuit. Install the new pipe with fresh seals or O-rings, torque fasteners to manufacturer specification, and refill and bleed the cooling system completely before starting the engine. Access to the pipe varies significantly by engine layout — on some Freightliner 122Sd engines the EGR cooler is buried under intake components that must be removed first, which accounts for most of the labor time.

Frequently asked questions

How much does it cost to replace EGR cooler coolant pipes on a Freightliner 122Sd?
The part itself starts at $10.95 on AutoBuffy. Total repair cost depends on whether you replace the pipe alone or combine it with an EGR cooler service. DIY installation keeps costs to the part price; shop labor for this job typically adds one to three hours of labor depending on engine access.
Can I drive my Freightliner 122Sd with a leaking EGR cooler coolant pipe?
No — driving with a leaking EGR cooler coolant pipe risks serious engine damage. Coolant loss leads to overheating, and if coolant enters the combustion chamber it can cause hydrolocking or accelerated cylinder wall wear. Stop driving and address the leak before the problem escalates to a much more expensive repair.
What causes the EGR cooler coolant pipe to fail on a Freightliner 122Sd?
The most common causes are corrosion from coolant breakdown, cracking from repeated heat cycling, and deterioration of the O-rings or seals at the pipe connections. Using the wrong coolant type or neglecting coolant flushes accelerates internal corrosion and shortens the pipe's service life considerably.
Do I need to replace the EGR cooler itself when I replace the coolant pipe on a Freightliner 122Sd?
Not always, but inspect the cooler carefully before reassembling. If coolant has been leaking internally into the exhaust side, the EGR cooler core may already be compromised. Replacing only the pipe and leaving a failing cooler in place often results in a repeat repair within a short period.
Does replacing the EGR cooler coolant pipe require bleeding the cooling system on a Freightliner 122Sd?
Yes. Any time the cooling system is opened, air can enter and cause air pockets that lead to overheating or inaccurate temperature readings. After installing the new pipe, refill with the correct coolant type and bleed the system according to the Freightliner 122Sd service procedure before returning the vehicle to normal operation.
Will a bad EGR cooler coolant pipe trigger a check engine light on a Freightliner 122Sd?
It can, though not always directly. A leaking pipe that causes coolant loss or overheating may trigger coolant temperature codes or EGR system performance codes. In some cases the only symptoms are physical — visible leaks or low coolant — with no warning light appearing until the situation becomes more severe.

Shop exhaust gas recirculation (egr) cooler coolant pipes by year for the Freightliner 122Sd

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More parts for your Freightliner 122Sd

Intercooler HoseFuel Filter SealFuel Line Seal RingSerpentine Belt Drive Component KitA/C Expansion ValveEngine Cylinder Head Bolt SetEngine Valve Cover GasketAccessory Drive Belt Tensioner Assembly

Exhaust gas recirculation (egr) cooler coolant pipes for other Freightliner models

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