There is a couple ways you can fix this but you need to find the source first. Are you sure it's leaking at the lines or the heater core? Roll under the truck and take a look.
There are 4 lines running to the HVAC compartment in the rear, 2 AC and 2 heater core lines. All 4 originate in the engine compartment. All 4 are made from aluminum but the coolant line change to rubber where they enter inside the truck. Also, there is a drain tube to get rid of the AC condensate (water), a heater core leak may drain from there too. However, most leaks that occur under the truck usually form at the clamps that hold them to the body/chassis from corrosion.
You can cut out the corrosion then splice in a piece of rubber. New lines are over $200 and require a lot of work to install.
Let us know where you find the leak, someone will post a diagram for you.
There are 4 lines running to the HVAC compartment in the rear, 2 AC and 2 heater core lines. All 4 originate in the engine compartment. All 4 are made from aluminum but the coolant line change to rubber where they enter inside the truck. Also, there is a drain tube to get rid of the AC condensate (water), a heater core leak may drain from there too. However, most leaks that occur under the truck usually form at the clamps that hold them to the body/chassis from corrosion.
You can cut out the corrosion then splice in a piece of rubber. New lines are over $200 and require a lot of work to install.
Let us know where you find the leak, someone will post a diagram for you.
