Buy 1990 Chevrolet G20 Beauville Extended Passenger Van 5.7L Chevrolet V8 A/T Engine Coolant Thermostat - OEM Chevrolet Part # 10126718

Engine Coolant Thermostat Housing. Outlet - Water. Water Neck.
Engine Coolant Housing where a Thermostat is used but not included.

Engine Coolant Thermostat Housing

All; 5.0L. All; 5.7L. G10-30 Vans; 5.0L. G10-30 Vans; 5.7L. G10-30 Vans; 7.4L.
Engine Coolant Thermostat Housing - Repair or Replace
A failed thermostat housing will likely result in a cooling system leak, or will cause the engine in your 1990 Chevrolet G20 to overheat. Consider replacing your engine coolant thermostat or having our staff of expert techs handle it for you.