Why is your 1988 Nissan pickup running hot?

Your 1988 Nissan pickup could be running hot due to several reasons, including a faulty thermostat that may not be opening properly, restricting coolant flow. Additionally, a clogged radiator or a malfunctioning water pump could prevent adequate coolant circulation. Check for leaks in the cooling system or a malfunctioning fan, which can also contribute to overheating. Lastly, low coolant levels can lead to insufficient cooling, so ensure the coolant is at the correct level.