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Skip to contentHC 47-57 Round
For a number of years Harrison produced a donut shaped Recirculating Heater Core. The lower priced Harrison Recirculating heater core generated less heat, used the in-cabin air and had the round core. Its most commonly found in southern mild climate cars and is a tricky little unit to make. If you are a purist, you will probably want your round Harrison cellular heater core restored. The trouble is, the replacement cell cores without tanks costs ~ $340 and they are rated for lowere pressure systems than today's modern engines.
Because most people just want their window clear of fog, their feet warm and their wife happy, we scrapped that idea and re-designed the heater core unit. The tube and fin core design can handle the system pressure and has a 5.2" 12V SPAL fan with 313CFM. We kept it all hidden inside the same round housing and did it so we would not break your bank.
You will need to mount the heater core to your existing frame and splice your wires together to power the 12V SPAL fan.
Built to order, building queue varies.
Made in the USA.
NOTE: We receive calls from our customers who retain the 6 volt electrical system and want to use our 12 Volt solution with an inverter. We defer to the electrical experts on the sensibility of this but the 12V fan used draws 5 Amps at 13Volt and would require a 15 Amp inverter.
Instructions
Other Notes: A Four Seasons 74661 Heater Valves may be used to activate the heater

We make to order. Please allow adequate time for us to build.
Build time estimates [April 23, 2026]
Model Ts Brass 18 weeks
Model Ts Black 13 weeks
Model As 17 weeks
Heater cores ~11 weeks
1928-34 Ford Hot rods 2-3 weeks
Common street rods ~12-15 weeks
Tricky customs & complicated restorations ~20-25 weeks
We appreciate your patience as we continue to recruit and train new fabricators and manage the labor shortfall our country has been experiencing.
We make to order. Please allow adequate time for us to build.
Estimated Build time [April 23, 2026]
Model Ts Brass 18 weeks
Model Ts Black 13 weeks
Model As 17 weeks
Heater cores ~11 weeks
1928-34 Ford Hot rods 2-3 weeks
Common street rods ~12-15 weeks
Tricky customs & complicated restorations ~20-25 weeks
We appreciate your patience as we continue to recruit and train new fabricators and manage the labor shortfall our country has been experiencing.