How to Convert Heater Hose to AN, In the Engine Compartment

Autoplumb offers two options, A & B, below to convert your Rubber Heater Hose to AN in the engine compartment. All the items needed are available on this page. Add Quantity in Cart.

A. To convert from existing Heater Core Tubes that exit the Firewall

1. If you are converting from existing heater Core Tubes exiting the Firewall with a Hose Barb on them, use our "Barb to AN Adapters". Select from the menu either (3/4" to -10AN) or (5/8" to -10AN) depending on the OD of the existing tubes.

2. To connect to most engines, (except LS see instructions below) select from the menu the appropriate (NPT to-10AN Adapters) to connect to the Water Pump, Manifold, etc.

3. Two methods can be used to convert the Hose Barbs of a LS pump to AN.

Method 1: Using our Barb to AN Adapters

a) Determine the correct tube size. (Most LS pumps have 1x 5/8" and 1x 3/4") 

b) Select from the menu 1x (5/8" to -10AN) and 1x (3/4" to -10AN) Barb to AN Adapter.

c) Simply install onto the existing barbed tubes.

Method 2: Using our NPT to AN Adapters

a) Remove the Barbed Tubes by twisting, turning, and prying them out of the pump. They are pressed in so they will come out.

This is just a suggestion only and recommend you do this with caution not to damage your pump.

b) Have your NPT to -10AN Adapter on hand to determine the depth of the tap. The holes can be tapped without the need to drill them 3/8" NPT and 1/2" NPT. Do not tap too deep

c) Select from the menu 1x (3/8"NPT to -10AN) and 1x (1/2" NPT to -10AN) NPT to AN Adapter. 

B. To connect to our Firewall Bulkheads

1. Select 2x (A/C O-Ring to AN Adapters) from the menu to convert our #10 AC Port Firewall Bulkhead to AN. 1 per pack, 2 are required.

2. Assemble a -10 AN Hose End to your hose. (See Hose End note below)

3. Attach directly to your converted -10 AN Firewall Bulkhead.

Hose Ends:

Choose the appropriate quantity, angle, and color of -10AN Hose Ends from the menu. Note: Add Quantity in Cart.  

We recommend and sell only Aeroflow FULL FLOW hose ends for our heater hose conversion.

Hose: 

Choose the desired type and quantity from the menu.

Attachment:

Choose the available Hose Separators and/or P-Clamps for clean and secure attachment from the menu.