Help a heavy-duty cooling system regulate coolant temperature with the Motorad engine coolant thermostat 4071-80, a heavy-duty 180-degree thermostat supplied with its seal. It is an original-equipment-design, direct-fit replacement for a long list of trucks, buses and motorhomes, including the 1989-2021 Blue Bird All American RE 8.3L / 8.9L, 2007-2013 American LaFrance Condor 8.3L / 8.9L and 2009-2020 Autocar LLC. Xpeditor 8.3L / 8.9L. Listed engines include L6-6.7L, L6-8.3L and L6-8.9L.
- OE-supplier build: Produced by an OE supplier using OEM-quality materials and safety standards, following OEM specifications and processes, with performance that equals or exceeds OEM standards.
- Copper case and wax compound: Designed to respond quickly to changes in coolant temperature, giving a consistent, precise response to the cooling system's needs.
- High-grade stainless steel and copper construction: Built to stand up to demanding heavy-duty cooling systems.
- 100% tested and calibrated: Every unit is tested and calibrated.
Specifications: The start-to-open temperature is 180°F (82.22°C). The sealing flange outside diameter is 2.85 in (72.39 mm), and the flange is 0.1 in (2.54 mm) thick. Height is 2.35 in (59.69 mm). The bypass flange diameter is 1.34 in (34.03 mm) and its length is 1.22 in (30.98 mm). One rubber O-ring seal comes pre-installed. The thermostat has no jiggle pin or weep hole, and no installation tool is included. The listed applications use one thermostat. Country of origin: China.
A thermostat that sticks open or closed can show up as overheating, an engine that is slow to reach operating temperature, a fluctuating temperature gauge or weak heater output. If a failed thermostat is the cause, this unit replaces it. Diagnose the cooling system before replacing parts. It fits many vehicles, so see the "Vehicles it fits" section for the full list.
Interchange: 80-1704 · 4071-80BP
801704 · 407180BP · 15218 · 4936026 · 4992231 · 5265799 · 5273379 · 5282375 · 9407180
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
80-1704, 15218, 4936026, 4992231, 5265799, 5273379, 5282375, 4071-80BP, 4071-80, 9407180
Frequently Asked Questions
What is the Motorad thermostat cross reference for 4071-80?
It interchanges with 80-1704, 4071-80BP, 15218, 4936026, 4992231, 5265799, 5273379, 5282375 and 9407180. The dashed numbers are also written 801704 and 407180BP.
What temperature does this thermostat open at?
The Motorad 4071-80 is rated to start opening at 180°F (82.22°C).
Does it come with a seal?
Yes. It includes one rubber O-ring seal that comes pre-installed on the thermostat. No installation tool is included.
What engines does it fit?
Listed applications include L6-6.7L, L6-8.3L and L6-8.9L engines in trucks, buses and motorhomes such as the 1989-2021 Blue Bird All American RE 8.3L / 8.9L. See the "Vehicles it fits" section for the full list.
What are signs a thermostat may need replacing?
Common signs include overheating, slow warm-up, a fluctuating temperature gauge or weak heater output. Diagnose the cooling system first, since other parts can cause these symptoms.
