CARRIER 0053507 - Caterpillar

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat® products.Dispose of all fluids according to local regulations and mandates.
Replace the thermostat regularly per the maintenance interval schedule. This action reduces the chance of unscheduled downtime and of problems with the cooling system.A new thermostat should be installed after the cooling system has been cleaned. Install the thermostat while the cooling system is drained completely. Or install the thermostat while the cooling system coolant is drained to a level that is below the thermostat housing.
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.
Open the left-hand engine compartment door.
Illustration 1 g06020980
Cooling system water temperature regulator
Loosen the hose clamp. Disconnect the hose from the thermostat housing assembly.
Remove the thermostat housing assembly.
Remove all gasket material from the engine cylinder head.
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 a new gasket and a new thermostat housing assembly on the engine cylinder head.
Install the hose on the thermostat housing assembly and tighten the hose clamp.
Replace the coolant that was drained from the system. Refer to Operation and Maintenance Manual, "Capacities (Refill)".
Close the left-hand engine compartment door.