Radiator Overflow Tank, OE-Style Black Brackets, 66-77 Ford Bronco SKU: 5042

Early Bronco Radiator Overflow Bottle with Black Brackets & Hose

Finish off your engine bay with this high-quality reproduction radiator overflow bottle—just like the original used on 1973-77 Ford Broncos down to the black steel mounting straps for a clean, durable finish.

This reservoir was designed to mount to the top of the passenger-side wheel well and can also be used on earlier Broncos, as long as your radiator has a provision for an overflow hose. This bottle features markings for HOT FULL, COLD FULL and ADD ONE QT to indicate when the Bronco is need of more engine coolant.

• Polished Stainless Steel Straps – Strong and rust-resistant with a premium look.

• OEM-Inspired Fit – Designed to match the original 73-77 overflow bottle fitment.

• Universal Compatibility – Works with earlier 66-72 Broncos when using a radiator with an overflow outlet.

• Easy Installation – Mounts on the passenger-side wheel well, just like the factory setup.

Bronco Overflow Bottle vs Surge Tank:

Broncos from 1966-72 came with a metal surge tank, plumbed into the cooling system via radiator hoses. By 1973, Ford switched to this more simplified overflow tank design. Rather than being fully integrated into the coolant system, this bottle catches overflow coolant from the radiator cap via a single hose and returns it to the radiator as the engine cools.