GAUGE AS-F SDR 4687834 - Caterpillar

Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.
Note: If you are only installing a new thermostat, drain the cooling system coolant to a level that is below the thermostat housing.
Loosen the hose clamp and remove the hose from the elbow. (The thermostat is integrated into the elbow housing.)
Remove the bolts and the thermostat housing assembly and discard.
Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a thermostat.Depending on load, failure to operate with a thermostat could result in either an overheating or an overcooling condition.
If the thermostat is installed incorrectly, it will cause the engine to overheat.
Install the new thermostat housing assembly on the engine cylinder head.
Install the hose. Tighten the hose clamp.
Top off the coolant tank with ELC coolant.