1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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17,293 Posts
Welcome to Allpar. This may need a good cooling system diagnosis. Don't overlook a wrong or defective radiator cap for low coolant temperatures.
There should be no flow in the radiator until the thermostat opens. You can visually confirm this by watching the level in the top tank. A 195˚ F themostat may be a better choice if the cooling system is in otherwise good health.
Dash gauges can be inaccurate and a handheld IR laser thermometer is great for looking at cold and hot spots.
The heater hoses should warm up before the radiator top hose does. The heater core inlet hose should be slightly warmer than the return hose. This shows heat transfer into the cabin is taking place.
Heater cable adjustments should also be checked for maximum heat flow. Any inline water valves must be fully open.
There should be no flow in the radiator until the thermostat opens. You can visually confirm this by watching the level in the top tank. A 195˚ F themostat may be a better choice if the cooling system is in otherwise good health.
Dash gauges can be inaccurate and a handheld IR laser thermometer is great for looking at cold and hot spots.
The heater hoses should warm up before the radiator top hose does. The heater core inlet hose should be slightly warmer than the return hose. This shows heat transfer into the cabin is taking place.
Heater cable adjustments should also be checked for maximum heat flow. Any inline water valves must be fully open.
