When to run hot or cold radiator hoses?
Both should be hot if circulation is occurring and the water pump should be circulating the water unless the engine is not running, but possibly not through the radiator or does not reach operating temperature.
When to close the radiator thermostat when not running?
The thermostat should be closed when the engine is cold and not running. Regulation of water by the thermostat prevents engine hot spots. Once the optimal temperature has been reached, the coolant water will be let into the radiator for energy dissipation.
Why is my lower radiator hose not running?
If your car is overheating and at the same time won’t heat the lower coolant hose – You most likely have a problem with your thermostat, which needs to get replaced. The thermostat should be closed when the engine is cold and not running.
What does the thermostat on a radiator do?
The thermostat has a special function within the circuit, it’s job is to restrict coolant flow back to the radiator when coolant temperature is below 180 deg F (83 deg C). Above this temperature a wax filled cylinder within the stat melts and expands causing the valve to open proportionally until fully open at about 199 deg F (93 deg C).
Both should be hot if circulation is occurring and the water pump should be circulating the water unless the engine is not running, but possibly not through the radiator or does not reach operating temperature.
The thermostat should be closed when the engine is cold and not running. Regulation of water by the thermostat prevents engine hot spots. Once the optimal temperature has been reached, the coolant water will be let into the radiator for energy dissipation.
If your car is overheating and at the same time won’t heat the lower coolant hose – You most likely have a problem with your thermostat, which needs to get replaced. The thermostat should be closed when the engine is cold and not running.
What does it mean when your Radiator is running cold?
This indicates that your radiator is operating correctly: it is successfully cooling the hot coolant which is leaving the engine via the upper radiator hose. The thermostat controls how much of this cold coolant is brought into the engine from the radiator, via the lower radiator hose.