See Details

25% Off Online Orders of Select Hard Parts. Enter Promo Code MMJ30 in Cart.

Close (X)

25% Off Select Parts and Accessories
Receive 25% Off Your Online or In-Store Purchase. Use promotional code MMJ25 at checkout to receive discount. Not valid in combination with any other discounts, promotions or items already on sale. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Those products that are included will be displayed in product search results and product detail pages. INCLUDES the following categories: Starters, Alternators, Fuel Pumps, Radiators, Shocks & Struts, Chassis, CV Axles, Batteries, Ignition, Window Motors, Wipers, Appearance Chemicals, Car Wash Accessories, Floor Mats, Lift Equipment, Hand Tools, Headlamps and Bulbs. Excludes the following brands: Powerstop, Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, Thule, Thule Karrite, JVC, Flowmaster, Hurst, B&M, MSD, Moog, Wagner and BBK Performance. Valid online until 2:59 am EST on 5/1/17.

Free Shipping on Orders Over $50 or in-store pickup

Heater Core


Heater Core

The heater core is a heat exchanger that serves to warm the vehicle passenger compartment. Outside air or existing air from the passenger compartment is directed over the radiator-like surface of the heater core by the blower motor and into the passenger compartment.

What is a Heater Core and what does it do

How Does it Work?

  • As coolant is directed through multiple tubes in the heater core, the aluminum fins surrounding the tubes dissipate heat from the engine coolant into the ambient air
  • The heater core has an inlet tube and an outlet tube where coolant is returned to the engine
  • A blower motor fan then pushes the warm air into the vehicle cabin on the demand of the temperature controls
  • Cabin temperature, airflow source and vent location are further controlled by the blend doors per direction of either manual or electronic controls

How is it Made?

  • Long brass tube with several bends wrapped within many aluminum fins stacked slightly apart

Why Does it Fail?

  • Clogged
  • Deterioration from the inside out
  • Worn out coolant
  • Leaking engine coolant

What are the Symptoms of Failure?

  • Loss of heating efficiency
  • If a leak is occurring, you may notice that the windshield becomes foggy, a damp spot on the floor and/or a sweet-smelling odor which is emanating from the leaked engine coolant

What are the Implications of Failure?

  • Vehicle may overheat and stop running
  • Vehicle may stop working

How Difficult is the Install?

Difficulty Rating:

Related Parts

Return to Parts Guides