Series 60 DDEC V Troubleshooting – Section 14.1 Faulty Thermostats

Section 14.1
Faulty Thermostats

To determine if faulty thermostats are causing low engine coolant temperature, perform the following:‪

1. Remove thermostat from the thermostat housing; refer to appropriate service manual, cooling system chapter.
2. Inspect thermostat for correct operation; refer to appropriate service manual, cooling system chapter.
   1. If thermostat did not open at 97°C (207°F), refer to "14.1.1 Thermostat Replacement" .

Section 14.1.1
Thermostat Replacement

Perform the following steps to replace thermostats:‪

1. Install new thermostat; refer to appropriate service manual, cooling system chapter.
2. Verify replaced thermostat; refer to "14.1.1.1 Test Engine with New Thermostat" .

Section 14.1.1.1
Test Engine with New Thermostat

Perform the following to determine if thermostat replacement resolved low engine coolant temperature: ‪

1. Start and run the engine.
2. Run the engine through its operating range with no-load for approximately 5 minutes, allowing the engine coolant to reach normal operating range.
   1. If the engine coolant temperature is 88-96°C (190-210°F), no further troubleshooting is required. Shut down the engine.
   2. If the engine coolant temperature is not 88-96°C (190-210°F), shut down the engine. Contact DDC Customer Support Center (313-592-5800).