WASHER GP-WINDSHIELD 3T3984 - Caterpillar

Probable Causes
Faulty jacket water heater
Faulty water temperature regulatorsRecommended Repairs
Check the Jacket Water Heater
Determine if the jacket water heaters are functioning properly.If the jacket water heaters are not functioning properly, determine the cause of the malfunction of the heaters. Make the necessary repairs.Check the Water Temperature Regulators
The water temperature regulators should not begin to open until jacket water reaches opening temperature for the regulators. Allow the engine to cool and then start the engine. Check the hose at the outlet for the jacket water. If the hose is warm and normal operating temperature is not achieved yet, a regulator may be stuck open.If the water temperature regulators are malfunctioning, check the water temperature regulators according to Systems Operation/Testing and Adjusting, "Testing the Cooling System". Replace the water temperature regulators, if necessary.