Quick Answer

You Asked What sizes does heater hose come in?

Heater hose comes in ½-, 8- or ¾-inch sizes and is usually sold by the foot. On some cars, the inlet hose could be a different size than the outlet hose, so don’t measure only one and assume they’re the same.

What is the OD of 3/4 heater hose?

1.07 in

Size 3/4 in
Hose Inner Diameter 0.75 in
Hose Outer Diameter 1.07 in

What is the outside diameter of 5/8 heater hose?

This is ⅞ Outside Diameter hose! Again, who cares about the OD? the ID is ⅝.

What is the inside diameter of a 1 inch heater hose?

O.D. x 3/4 in. I.D.

What size radiator hose do I need?

On traditional muscle-car V8 engines, typically the lower radiator hose should be about 1438-inch larger than the top hose (for example, if the top hose ID is 1 Inches, the bottom hose usually measures 134 or 178 inches).

Is heater hose the same as radiator hose?

Both the upper and lower radiator hoses are the largest hoses in the cooling system connected to the engine. Heater hoses are smaller hoses that are attached to the heater core, which is located under the dashboard, to supply warmth to passengers in the cabin.

Where is the radiator hose?

There are two hoses that connect to the radiator. The upper hose attaches from the top of the radiator to the top of the engine. The lower hose attaches to the bottom of the radiator to the water pump of the engine.

What is a heater hose?

Heater hoses are used to transfer the excess heat, in the form of engine coolant, from the engine into the heater core. Once the heated engine coolant reaches the heater core, it travels through small tubes inside the heater core.

What size hose is 10 an?


AN Size Metal Tube O.D. Thread Size
-10 AN 5/8″ 7/8″ – 14 SAE
-12 AN 3/4″ 1-1/16″ – 12 SAE
-16 AN 1″ 1-5/16″ – 12 SAE
-20 AN 1-1/4″ 1-5/8″ – 12 SAE

Does coolant go to heater core?

The heater core has tubes that circulate hot engine coolant through them before the coolant is returned to the radiator. Air blows over the hot coolant to warm it before it’s blown through your vehicle’s vents.

How do you replace a heater hose?

Beta Program

  1. Remove the pressure cap from the radiator or coolant reservoir and place a bucket or drain pan under the radiator drain valve.
  2. Open the drain valve.
  3. Remove the clamps at both ends of the hose.
  4. Twist the hose to remove it, and use the container to catch the liquid that drains from it.
  5. Clean the fittings.

How do you measure a radiator hose?

Tubes are always measured by the O.D (outside diameter). This is the important measurement. The inside diameter might be quoted on a technical drawing etc but this is not as crucial. Tubes are measured by the O.D because they fit inside a hose.

Are radiator hoses the same size?

The most common sizes of heater hose are 5/8″ and 3/4″. Inside a heater hose you can see the edges of the cords. Note the thin wall and sparse cord, this is low-pressure stuff. Radiator hoses are also lined with cords, but they are molded to shape.

Which is the inlet and outlet on a car radiator?

Answer: The hose that goes to the heater water pump area is the heater inlet. These flush kits will work on either one, though, as they go through the cooling system as a whole. The other hose in your heating system is the outlet.

Can you use fuel hose for heater hose?

There is no difference in size between the hoses, but they are made the same. Fuel cannot be transported with a coolant hose. It is possible to form or loose spool the hose. heater hose is most commonly 5/8′′ and 3/4′′ in diameter.

How often should you change heater hoses?

Answer: Heater hoses can last from five to over ten years. However, it is very important to test periodically the condition of your heater hoses. Wait until your engine has a chance to cool and then feel your heater hoses. They should not feel too hard and brittle or too soft and mushy.

Does the heater hose connect to the radiator?

Are a Car’s Radiator and Heater Hoses the Same?

What are the 2 different types of radiator hoses?

There are two types of radiator hoses, upper and lower.

Which hose is the inlet on a radiator?

The upper radiator hose is where the hot coolant enters the radiator from the engine. It cycles through the radiator, cooling as it goes. When it reaches the bottom, it moves out of the radiator through the lower hose and back into the engine to start the cycle once more.

Why did my radiator hose come off?

The most common cause for radiator hose collapse is a vacuum issue caused by a faulty radiator cap. Caps are rated around 14–16 psi. Under normal circumstances, caps should release the negative pressure caused when an engine cools down and the liquid coolant contracts.

How much does it cost to replace a heater hose?

The average cost for heater hose replacement is between $461 and $489. Labor costs are estimated between $101 and $128 while parts are priced between $360 and $362. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

How many heater hoses are in a car?

In general, cars have two primary heater hoses: one for each direction. So, in order to really understand how the heater hoses work, you have to understand how coolant and heater cores work.

Can you drive without a heater hose?

You can still drive on with the condition
however, you should not, for a long time
. The heater core uses the engine’s coolant, and a faulty heater core affects the cooling effect which then raises the temperature. Not curing the issue and continue to drive the vehicle this way can lead to further engine damage.

Is 3AN the same as 3 16?

3AN hose has the same ID as a 3/16″ tube. This means that 6AN hose will not introduce any appreciable flow restriction in a fuel system designed around 3/8″ OD rigid tubing.

How do I know my fitting size?

You can always identify AN fittings based on the male thread size (outside diameter). These sizes are constant regardless of brand, hose type, or fitting configuration. If your fitting has a convex 37 degree flare at the end, the threads will tell you the AN size (and vice-versa).

What size is #12 hose?

How to Interpret Hose, Tube & Fittings “Dash Sizes”

HOSE I.D (Inches)
All EXCEPT Transportation & Refrigerant Hoses Transportation & Refrigerant Hoses
-10 5/8 12,5
-12 3/4 16
-16 1 22