Spectra Premium HVAC Heater Core P/N:99436
Warm the cab and keep the defrost vents clear with the Spectra Premium HVAC Heater Core, part number 99436. This heater core is a compact coolant-to-air heat exchanger: hot engine coolant flows through its core while the blower pushes cabin air across it, warming the interior and supporting windshield defrost. It installs as a direct-fit replacement for a wide range of Ford heavy-duty trucks (see fitment below).
- Coolant-to-air heat exchanger: circulates engine coolant so blower air is heated for cabin comfort and defrost.
- Direct-fit application: engineered to replace the heater core on the listed Ford trucks.
- Signs this part may need replacing: weak or no heat, a sweet coolant odor inside the cab, fogged-up windows, or a damp floor — if a leaking or clogged heater core is the cause, this replaces it.
Diagnose the cause of a heating or cooling-system complaint before replacing, since these symptoms can have other sources. Because it carries engine coolant, take care to depressurize and drain the cooling system during service.
Interchange: ABN83315225 · MC1160 · MC1180 · 6001250 · 938078 · HTR010757 · 4379RD106800 · 6820 · MC11600 · MC11800 · 1812043 · 76R3900 · RD1068000P · RF55720237 · 102656 · RDHRD10800P · Manufacturer part number 99436.
Fitment: 1987-1988 Ford L8000 · 1987-1991 Ford L8000F · 1987-1991 Ford L9000 · 1991 Ford LA8000F · 1988-1991 Ford LA9000 · 1987-1988 Ford LL9000 · 1987-1991 Ford LN7000 · 1987-1991 Ford LN8000 · 1987-1991 Ford LN9000 · 1987-1988 Ford LNT8000 · 1987-1991 Ford LNT8000F · 1987-1991 Ford LNT9000 · 1987-1989 Ford LS8000 · 1987-1991 Ford LS8000F · 1987-1991 Ford LS9000 · 1987-1988 Ford LT8000 · 1987-1991 Ford LT8000F · 1987-1991 Ford LT9000 · 1988-1991 Ford LTA9000 · 1987-1991 Ford LTL9000 · 1987-1989 Ford LTS8000 · 1987-1991 Ford LTS8000F · 1987-1991 Ford LTS9000. See the Buyer's Guide tab for the full list.
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What does this heater core do?
It is a small coolant-to-air heat exchanger. Hot engine coolant flows through its core while the blower pushes cabin air across it, warming the interior and helping clear the windshield during defrost.
Which vehicles does the 99436 heater core fit?
It is a direct-fit replacement for a range of Ford heavy-duty trucks, including the 1987-1991 L9000, LN7000, LT9000, LTL9000 and LTS9000 series. See the Buyer's Guide tab for the full list.
What are signs my heater core may need replacing?
Common signs include weak or no heat, a sweet coolant smell in the cab, fogged windows, or a damp floor. Diagnose the cause first, as these can have other sources; if the heater core is at fault, this replaces it.
Does this handle engine coolant or A/C refrigerant?
It is a coolant-side part. It circulates hot engine coolant through its core to provide cabin heat, so depressurize and drain the cooling system before servicing it.
What part numbers does this heater core interchange with?
It cross-references ABN83315225, MC1160, MC1180, 6001250, 938078, HTR010757, 4379RD106800, 6820, MC11600, MC11800, 1812043, 76R3900, RD1068000P, RF55720237, 102656 and RDHRD10800P.
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