Bleed the cooling system by undoing the burp bolt on the front of intake near the 2 water sensors. You might have an air pocket in the system. Fill radiator with this bolt out. When fluid pours out, put bolt back in and tighten. Then top of radiator. If problem persists, then it might be time for a thermostat, fan clutch or flush out the radiator, inside and out. Make sure you dont have a coolant leak first.
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My stable of Nissan trucks includes:
1987 Nissan King Cab(full frame off Restoration).
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