- 1). Open the hood of the truck and look on the passenger (left) side of the engine compartment. There will be two black hoses (about 1 1/4-inch OD) that run side by side into the firewall behind the engine. These are the inlet and outlet hoses to the heater core.
- 2). Use a knife or scissors to cut the hoses between 6 and 8 inches away from the firewall.
- 3). Take the two hoses that are no longer attached to the firewall and connect them together with the 90 degree barbed fitting.
- 4). Add the pipe clamps over the ends of the hoses and on the barbed fitting and tighten them.
If you start the engine and antifreeze doesn't spray everywhere you have successfully bypassed the heater core.
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