On most cars, the climate control's heater is powered by coolant from the engine, taking the heat and transferring it to the heater vents in the car. If these lines are broken or damaged, not only will it reduce your heater's function, but you'll also lose coolant. This can lead to overheating the engine in your vehicle. Swapping out these heater hoses can be done easily, but you must first remove the old ones.
Open the hood and locate the heater hoses connected to the firewall. There should be two of them: one for the inlet and another for the outlet. It does not matter which heater hose you remove first. Place the drain pan underneath the heater hoses to catch any excess coolant that spills from the heater hoses.
Unscrew the hose clamp connecting one of the heater hoses to the firewall using a flathead screwdriver. If the clamps feature a spring style, then use the pliers to push together the clamp and slide it off of the hose. Do this for both heater hoses.
Pull off the heater hose using your hands and allow the coolant to drain into the pan. Repeat this process for the other heater hose on the firewall.
Trace the heater hoses to their connections on the engine block. Unscrew the hose clamps using a flathead screwdriver or use the pliers to separate the clamps, then pull the hoses off the block and place them to the side.
