AutoPlumb offers the following methods to convert your existing heater core tubing to AN. All products are available at the bottom of each method.
Method 1:
To Convert From Existing Heater Core Tubes That Exit The Firewall to AN
1. If you are converting your existing barbed heater core tubes exiting the firewall, use our Barb to -10AN Adapters.
Accurately measure the tubes (not the barb)
Select from the menu either 3/4" or 5/8" depending on the OD of your existing tubes.
To Convert The Manifold, Water Pump, etc. of Chevy and Ford Engines
1. Use our NPT to -10AN Adapters
It is recommended to use a straight NPT to -10AN Adapter, then attach your hose using your preferred angle -10AN Hose end.
To Convert The Hose Barbs of a LS Pump to AN
Option 1: Using our Barb to -10AN Adapters.
Accurately measure the tubes (not the barb)
Select from the products either 3/4" or 5/8" depending on the OD of your existing tubes.
Option 2: Using our NPT to -10AN Adapters
Remove the barbed tubes by twisting, turning, and prying them out of the pump. They are pressed in so they will come out. Do this with caution to avoid damaging your pump.
The holes can be tapped 3/8" NPT and 1/2" NPT without the need to drill them. Have an NPT to -10AN Adapter on hand to determine the depth of the tap. Do not tap too deep.
Select from the products (1) 3/8" NPTto -10AN and (1) 1/2" NPT to -10AN
Connecting With Hose Ends
Each line will require (2) -10AN Full Flow Hose Ends. Select which angles will work best for your system.
Measure the distance between the fittings at the firewall and at the engine to determine your length of -10AN Braided Hose.
Method 2:
To Connect Heater Core Tubes To 5/8" Barb On The Back of Our -10AN Firewall Bulkhead
IMPORTANT: The bulkhead inserts use a 5/8" Barb to A/C-style O-ring port. To convert each A/C port to -10AN on the engine side, you must use A/C O-Ring to AN adapters. (2 adapters required — one per insert)
1. To convert your SMOOTH heater core tubing with NO BARB to 5/8" Barb, follow the instructions below.
Smooth 3/4" Heater Core Tubing
Install (1) 3/4" to -12AN Tube Adapter onto the 3/4" heater core tube.
Thread on (1) Female -12AN to 5/8" Hose Barb Fitting.
Slide 5/8" Push-Lock Hose onto the barb fitting.
Secure the hose using 5/8" Hose Clamps (required for heat applications).
Use Hose Clamp Pliers to ensure the clamp is fully seated.
Smooth 5/8" Heater Core Tubing
Install (1) 5/8" to -10AN Tube Adapter onto the 5/8" heater core tube.
Thread on (1) Female -10AN to 5/8" Hose Barb Fitting.
Slide 5/8" Push-Lock Hose onto the barb fitting.
Secure the hose using 5/8" Hose Clamps (required for heat applications).
Use Hose Clamp Pliers to ensure the clamp is fully seated.
2. To convert your BARBED heater core tubing to 5/8" Barb, follow the instructions below.
Barbed 3/4" Heater Core Tubing
Install (1) 3/4" to -10AN Barb Adapter onto the 3/4" heater core tube
Thread on (1) Female -10AN to 5/8" Hose Barb Fitting.
Slide 5/8" Push-Lock Hose onto the barb fittings.
Secure the hose using 5/8" Hose Clamps (required for heat applications).
Use Hose Clamp Pliers to ensure the clamp is fully seated.
Barbed 5/8" Heater Core Tubing
Slide 5/8" Push-Lock Hose onto the barb fittings.
Secure the hose using 5/8" Hose Clamps (required for heat applications).
Use Hose Clamp Pliers to ensure the clamp is fully seated.
Method 3:
To Convert Heater Core Tubes To -10AN & Connect To The Back of Our -10AN Bulkhead
1. To convert your SMOOTH heater core tubing with NO BARB to -10AN, follow the instructions below.
Smooth 3/4" Heater Core Tubing
Install (1) 3/4" to -12AN Tube Adapter onto the 3/4" heater core tube.
Thread (1) -12AN to -10AN Flare Reducer onto the -12AN Tube Adapter.
Attach (1) -10AN Hose End to the reducer.
Measure and cut your -10AN Nylon Braided Hose to length.
Install (1) -10AN Hose End onto the other end of the hose.
Connect that hose end to the back of the -10AN Firewall Bulkhead.
Smooth 5/8" Heater Core Tubing
Install (1) 5/8" to -10AN Tube Adapter onto the 5/8" heater core tube.
Attach (1) -10AN Hose End to the tube adapter.
Measure and cut your -10AN Nylon Braided Hose to length.
Install (1) -10AN Hose End onto the other end of the hose.
Connect that hose end to the back of the -10AN Firewall Bulkhead.
2. To convert your BARBED heater core tubing to -10AN, follow the instructions below.
Select the correct Barb to -10AN Adapter for your heater core tube size (5/8" to -10AN or 3/4" to -10AN)
Install the barb adapter onto the heater core tube.
Attach (1) -10AN Hose End to the -10AN side of the barb adapter.
Measure and cut your -10AN Hose to the required length.
Install (1) -10AN Hose End onto the opposite end of the hose.
Connect the hose to the back of the -10AN Firewall Bulkhead.
