How to change heater core in 2005 GMC 2500HD or site with directions.
How to change heater core.?
Its pretty straightforward. two 1%26quot; tubes on the passenger side of the engine bay lead to teh core, disconnect them, then take out the panels under the passenger side and swap it
How to change heater core.?
Technically remove all coolant from the system by draining it from the radiator into a pan used for removing oil. Remove the two 2%26quot; hoses that are connected to the firewall, inside there is your heater-core, you must now take apart the under dash assembly to gain access to the heater core, after you cut the hoses on the engine side only then can you remove your heater core.
Please dispose of your old coolant properly at your local station. Installation is the opposite of removal.
You can however check the state of the current coolant for reuse. Use at least 70 coolant/ 30 water
