How do I replace a blown heater or radiator hose?

Replacing a blown heater hose requires the engine coolant to be cool in order for you to not be burned. If the hose has burst a substantial amount of coolant will already have been lost. Identify each end of the hose and remove any hold down attachment clamps. Remove the clamps from the hose where it attaches to the engine and at the heater core. Obtain a new heater hose of the same size (diameter and length). Slide end clamps (best to have new clamps) onto the hose (each end) for a distance of about 2 inches.Connect the new hose into place by sliding the new hose over the bard-like connectors. Slide the clamps back toward the ends of the hose and tighten.
Fill the radiator with 50/50 antifreeze mixture. Crank the engine and allow the thermostat to open (opens automatic when appropriate temperature is achieved). Continue to slowly add antifreeze until the radiator is full and most/all of the air has been removed. Replace the radiator cap. Add antifreeze mixture to the remote reservoir until the proper fluid level is obtained. Check for leaks. Check the temperature gauge if equipped. Turn on the heater (high) and observe the coolant level in the reservoir. If it drops substantially add more antifreeze. Drive the car for several blocks and check for leaks and reservoir level. Add antifreeze if needed.

If the heater hose is the GM hose with molded on attachment ends, get a shop to replace the hoses as the ends require special disconnect tools and the ends are prone to break when removing them.

Replacing a radiator hose is much the same procedure as replacing a heater hose, except there maybe more difficulty in removing the radiator hose and it may be more messy. Be sure to obtain the correct hose from an auto parts store. It is best to use new hose clamps. Allow the air to escape as described above, including running the heater.