[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|Here are some steps to replace the heater core in your 1979 Ford F250 Custom Pickup|new_window=true]^^[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|1|new_window=true]^^:
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[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|Here are some steps to replace the heater core in your 1979 Ford F250 Custom Pickup|new_window=true]:
# ***Disconnect the battery ground cable***.
# ***Remove the air cleaner***.
# ***Drain the engine coolant*** below the level of the heater core.
# ***Remove the heater hoses*** from the heater core.
# ***Remove the screw fastening*** the A/C hose support bracket to the firewall.
# ***Remove the insulating tape*** covering the valve.
# ***Remove the two screws holding the plate*** over the opening that the A/C hoses exit the evaporator housing.
# ***Remove the plate and the seal***.
# ***Remove the glove box liner***.
# ***Separate the A/C duct*** from the register in the instrument panel and free the clip holding it to the plenum.
# ***Remove the duct from under the dash***.
# ***Remove the vacuum hose*** from the vacuum motor on the right-hand side of the airbox.
# ***Remove the rear housing cover*** from the evaporator housing. The cover is retained by 4 nuts and one bolt.
# ***Disconnect the fresh air tube*** from the rear cover.
# After removing, reinstall one nut to secure the evaporator housing to the firewall.
# Gently remove the capillary tube from the evaporator core.
# Disconnect wires from icing sensor and remove sensor plate.
# Remove plenum by extracting two screws above transmission tunnel that hold plenum to dash.
# Remove screws securing evaporator, pull it from case and secure it above case.
# Remove heater core and heater air control door (retained by spring clip).
# Remove arm supporting air control door and retainer securing pivot arm.
# Remove blower motor and transfer blower wheel to new motor.
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[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|After removing old heater core, you can install new one by reversing these steps|new_window=true]^^[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|1|new_window=true]^^.
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[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|After removing old heater core, you can install new one by reversing these steps|new_window=true].
You can also check out these videos for a visual guide:
* [link|https://www.youtube.com/watch?v=sSsMy4TcbIk|1979-1986 Ford F150 F250 Heater Core Replace How-To|new_window=true]
* [link|https://www.youtube.com/watch?v=AjS7DcF_ySs|73-79 Ford Truck Heater box removal (The right way!)|new_window=true]
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Please remember to take necessary precautions while working on your vehicle, including wearing appropriate safety gear and ensuring your work area is well-ventilated.
[link|https://www.fordshopmanual.com/ford-truck-parts-catalogs/1973-1979-ford-truck-parts-catalog-pdf-download/|1979 Ford Truck Parts Catalog|new_window=true] may also be of interest to you.
[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|Here are some steps to replace the heater core in your 1979 Ford F250 Custom Pickup|new_window=true]^^[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|1|new_window=true]^^:
# ***Disconnect the battery ground cable***.
# ***Remove the air cleaner***.
# ***Drain the engine coolant*** below the level of the heater core.
# ***Remove the heater hoses*** from the heater core.
# ***Remove the screw fastening*** the A/C hose support bracket to the firewall.
# ***Remove the insulating tape*** covering the valve.
# ***Remove the two screws holding the plate*** over the opening that the A/C hoses exit the evaporator housing.
# ***Remove the plate and the seal***.
# ***Remove the glove box liner***.
# ***Separate the A/C duct*** from the register in the instrument panel and free the clip holding it to the plenum.
# ***Remove the duct from under the dash***.
# ***Remove the vacuum hose*** from the vacuum motor on the right-hand side of the airbox.
# ***Remove the rear housing cover*** from the evaporator housing. The cover is retained by 4 nuts and one bolt.
# ***Disconnect the fresh air tube*** from the rear cover.
# After removing, reinstall one nut to secure the evaporator housing to the firewall.
# Gently remove the capillary tube from the evaporator core.
# Disconnect wires from icing sensor and remove sensor plate.
# Remove plenum by extracting two screws above transmission tunnel that hold plenum to dash.
# Remove screws securing evaporator, pull it from case and secure it above case.
# Remove heater core and heater air control door (retained by spring clip).
# Remove arm supporting air control door and retainer securing pivot arm.
# Remove blower motor and transfer blower wheel to new motor.
[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|After removing old heater core, you can install new one by reversing these steps|new_window=true]^^[link|https://www.ford-trucks.com/articles/heater-core-removal-and-installation-for-1973-1979-ford-f-series-trucks/|1|new_window=true]^^.
You can also check out these videos for a visual guide:
* [link|https://www.youtube.com/watch?v=sSsMy4TcbIk|1979-1986 Ford F150 F250 Heater Core Replace How-To|new_window=true]
* [link|https://www.youtube.com/watch?v=AjS7DcF_ySs|73-79 Ford Truck Heater box removal (The right way!)|new_window=true]
Please remember to take necessary precautions while working on your vehicle, including wearing appropriate safety gear and ensuring your work area is well-ventilated.
[link|https://www.fordshopmanual.com/ford-truck-parts-catalogs/1973-1979-ford-truck-parts-catalog-pdf-download/|1979 Ford Truck Parts Catalog|new_window=true] may also be of interest to you.