G3500 A3 Engines Caterpillar

Coolant Pressure Is Low

Usage:

G3508 DLR

Probable Causes

Low coolant level
Insufficient coolant flow

Recommended Actions

Low Coolant Level

Check coolant level. If the coolant level is low, inspect the cooling system for leaks.

If the coolant level is low, fill the cooling system. If leaks are found, perform the necessary repairs.

Insufficient Coolant Flow

Use Caterpillar Electronic Technician (ET) to observe the pressure at the jacket water outlet while the engine is off. Also, observe the reading during engine operation.

If the reading is not reasonable or not within specifications, install a pressure gauge near the pressure sensor. Compare the gauge reading with the reading from Cat ET.

If the reading from the pressure gauge does not agree approximately with Cat ET, troubleshoot the circuit for the pressure sensor. Refer to Troubleshooting, "PWM Sensor".

If the reading from the pressure gauge agrees approximately with Cat ET, check the following components for problems:

Water temperature regulators
Radiator or the heat exchanger
Jacket water pump

Perform the necessary repairs.

Caterpillar Information System:

G3500 A3 Engines Coolant Pressure Is High

320 VH and VM Variable Gauge Undercarriage Track Carrier Roller - Remove and Install - VM Undercarriage

C27 and C32 Industrial Engines Rear Power Take-Off (RPTO) - Install

C175-16 Locomotive Engine Engine Oil Pressure - Test

C3.4B Engines Cylinder Is Noisy

C3.4B Engines Coolant Temperature Is High

2010/10/20 A New Camshaft Thrust Washer and Plate Are Used in C175-16 Generator Set Engines {1210, 1210, 7553}

C3.4B Engines Coolant Contains Oil

C3.4B Engines Battery Problem

C3.4B Engines Alternator Problem - Charging Problem and/or Noisy Operation

C6.6 Industrial Engine Flywheel Housing - Flywheel Housing that is Equipped with Rear Power Take-Off

C4.4 Industrial Engine Fuel Filter Base - Primary Fuel Filter Base

C9.3 Tier 4 Final Engines Electric Starting Motor

C3.4B Engines Electronic Service Tool Does Not Communicate

C3.4B Engines Engine Does Not Crank

C3.4B Engines Engine Has Mechanical Noise (Knock)

C3.4B Engines Engine Shutdown Occurs Intermittently

C6.6 Industrial Engine Exhaust Cooler (NRS) - Test

C9.3 Tier 4 Final Engines Pressure Sensor (NOx Reduction System)

C18 Generator Set Engines Secondary ECM Assumes Control

C9.3 Tier 4 Final Engines Temperature Sensor (NOx Reduction System)

G3304B and G3306B Engines Air/Fuel Ratio Control - Adjust

2011/03/02 A New Filter Connector is Added to the Pilot Hydraulic System on Certain Excavators {5264}

C15 and C18 Engines Severe Service Application