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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 3.6L - DTCS P000A To P0155 >> Diagnosis And Testing >> P0128-Thermostat Rationality >> When Monitored

When Monitored

With the engine running, ambient temperature between -8°C (17.6°F) and 50°C (122°F), start up coolant temperature less than 50°C (122°F) and average vehicle speed greater than 16 kph (10 mph) until coolant temperature reaches 85°C (185°F).