Where is the thermostat of the Besturn B70 located?
3 Answers
The thermostat of the Besturn B70 is installed between the engine outlet pipe (commonly known as the upper water pipe) and the radiator (commonly known as the water tank). Introduction to the thermostat: The thermostat automatically adjusts the amount of water entering the radiator based on the temperature of the coolant, changing the water circulation range to regulate the cooling system's heat dissipation capacity, ensuring the engine operates within the appropriate temperature range. Function of the thermostat: The role of the thermostat is to prevent the engine from becoming too cold. After the engine is running normally, during rapid driving in winter, without a thermostat, the engine temperature might drop too low. In this case, the engine needs to temporarily stop water circulation to ensure the engine temperature does not become excessively low.
The thermostat of the Bestune B70 is located in the engine compartment, just follow the upper radiator hose. It's usually installed between the engine cylinder head's water outlet and the radiator inlet pipe, appearing as a cylindrical component with a housing. I've replaced it several times—you need to drain some coolant first to prevent spills. Open the plastic or metal housing, and the old thermostat is clamped inside. Be careful not to install the new thermostat backward, and ensure it comes with a proper sealing ring to avoid leaks, which can be more troublesome. After installation, refill the coolant, start the engine to bleed air, and monitor if the water temperature normalizes. While the job isn't overly difficult, slipping can lead to burns, and incomplete air bleeding affects the heater's performance. If unsure, it's safer to visit a repair shop—labor costs usually run around a hundred yuan.
Last time I drove the Besturn B70 on a long trip, the water temperature warning light came on. After checking, it turned out the thermostat was stuck. It's hidden on the right side of the engine, near the alternator. To remove it yourself, you'll need an 8mm wrench. First, loosen the drain bolt to empty the coolant, then remove the three mounting screws to take out the thermostat housing. Gotta complain about the design here: the space is tight with limited working room. When installing the new thermostat, remember to check the spring orientation and apply some sealant to prevent leaks. After reassembly, don't rush to close the cap when refilling coolant - start the engine and wait for the fan to cycle twice until the temperature gauge stabilizes, which means successful air bleeding. For routine maintenance, feel the temperature difference between the upper and lower hoses - if both are equally hot, it might indicate the thermostat is stuck open and needs replacement.
