When engine is cold, check the coolant level in radiator. After replacment of thermostat, there is a possibility bleedng was not done resulting in air trapped in system.
If coolant level is low, top it up and start engine without the radiator cap. Turn heater to maximum heat. Top up when coolant level drops as air is being purged. When coolant stabilises, close radiator cap and retest.
Thursday, March 14th, 2019 AT 6:17 PM