HomeHVAC > Hoses and PipesDorman 626-321 HVAC Heater Core Tube
Part #: 626-321

Dorman 626-321 HVAC Heater Core Tube

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6 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
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*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Dodge, Ram 2500 and Ram 3500
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Dorman HVAC Heater Core Tube 626-321

The Dorman HVAC Heater Core Tube 626-321 is designed specifically for Dodge Ram 2500 and Ram 3500 models. Constructed from durable steel, this 12-inch heater core tube ensures reliable performance within your vehicle's HVAC system.

  • Material: Steel for strength and durability
  • Length: 12 inches
  • End Types: Hose connections on both ends for secure fitment
  • Inside Diameter: 0.7 inches
  • Color/Finish: Black
  • Maximum Working Pressure: 100 psi
  • Single component construction for simplified installation
  • No gasket, seal, heat shield, or protective sleeve included or required
  • Package includes one coolant tube

Detailed Product Description

The Dorman 626-321 HVAC Heater Core Tube is engineered to meet the specific requirements of Dodge Ram 2500 and Ram 3500 trucks. Made from steel, this tube offers resistance to corrosion and wear, ensuring long-term durability under typical operating conditions. Its 12-inch length and 0.7-inch inside diameter are designed to match OEM specifications, providing a precise fit and optimal coolant flow. Both ends feature hose connections, facilitating straightforward integration with existing HVAC hoses. The black finish adds a protective layer against environmental factors without the need for additional heat shields or protective sleeves.

Common Applications and Issues Addressed

  • Replacement of damaged or corroded heater core tubes in Dodge Ram 2500 and Ram 3500
  • Resolving coolant leaks within the HVAC system
  • Restoring proper heater core coolant flow for effective cabin heating
  • Addressing HVAC system failures related to compromised heater core tubing
  • Maintaining system pressure up to 100 psi to prevent coolant loss

Installation Notes and Tips

Installation of the Dorman 626-321 heater core tube requires basic mechanical skills and standard hand tools. Ensure the vehicle is cooled down before beginning work to avoid injury from hot coolant. Carefully remove the old heater core tube and inspect surrounding hoses for wear or damage. Since this part does not include gaskets or seals, reuse existing seals if in good condition or replace as necessary. Confirm hose connections are secure to prevent leaks. No heat shield or protective sleeve installation is required, simplifying the replacement process.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 626-321 heater core tube undergoes quality inspections to ensure durability and performance in Dodge Ram 2500 and Ram 3500 vehicles. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to Dorman’s official warranty policy for complete information.

BrandDorman
Part Number626-321
Color/FinishBlack
Construction TypeSingle Component
Coolant Hose Heat Shield IncludedNo Heat Shield Required
Coolant Hose Protective Sleeve IncludedNo Protective Sleeve Required
End 1 TypeHose
End 2 TypeHose
Gasket Or Seal IncludedNo
Inside Diameter0.7
Length12
MaterialSteel
Maximum Working Pressure (psi)100 PSI
Package Contents1 Coolant Tube

This part fits 6 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2005DodgeRam 25005.9LL6N/A
2005DodgeRam 35005.9LL6N/A
2004DodgeRam 25005.9LL6N/A
2004DodgeRam 35005.9LL6N/A
2003DodgeRam 25005.9LL6N/A
2003DodgeRam 35005.9LL6N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

3979050

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.