The heater core is companion to a insufficient radiator in the heating process the antifreeze passes wound up. Over eternity, geriatric coolant can clog up the core. A clogged core won't sanction the antifreeze to pass ended it; as a backwash, the heater won't blow absent clement air.
Checking the Core
Another custom to test the heater core is ended the heater hoses. There are two hoses that connect fini the firewall to the core. They should both atmosphere sizzling while the engine and heater are running; provided one of them feels cool, there is possible a count with the core.Whether the antifreeze isn't passing nailed down the heater core, it Testament leak elsewhere. The leaking antifreeze normally puddles in the passenger side floorboard, so analysis there. You should besides Aroma a candy Aroma while running the heater.
Flushing the Core
One of the simplest ways to unclog a heater core is to flush it. Wait until the heater hoses are algid and then disconnect them from the firewall by loosening their clamps; wristwatch gone for coolant that may leak away. Embrace a garden hose into one of the openings, turn it on and glom for the aqua to come outside the openings. A garden hose can deliver a parcel of drench strength, especially the instant it's turned on after being off for a long time. Too much water pressure can rupture the heater core. Turn the hose on before you connect it and turn it off once a steady stream is flowing. Once you connect it, turn it on slowly and gradually increase its pressure just enough to receive a steady flow form out the other opening. Once the stream of water is clear, reconnect the heater hoses and test the heater again.
Replacing the Core
If the heater core remains clogged, it likely needs to be replaced. The exact procedure greatly varies depending on your model, but it is often a complex procedure. You first need to drain the coolant from the system using the drain plugs at the radiator and engine block. You also need to disconnect at least the heater hoses from the firewall. On almost all vehicles, you have to remove the instrument panel from inside the car, which often involves disconnecting all trim panels in the area, the steering wheel, airbags, air vents and all electrical connectors. The core itself is usually in a housing you must open in order to remove and replace it. Using a repair guide for your exact model is vital and leaving this procedure to a professional are recommended.
