Why is my radiator hose hot?
Usually the top radiator hose is connected to the thermostat. The thermostat will open when the engine coolant reaches a certain temperature. If the top radiator hose gets hot quickly, it could mean that the thermostat is opening too early or is stuck open.
What happens if my thermostat is stuck closed?
If the thermostat becomes stuck in the closed position, the circulation of the coolant is blocked so the coolant cannot get to the radiator to be cooled which causes the engine to overheat.
Why is the thermostat closed when the engine is not running?
The thermostat is 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 too much of the coolant goes to the radiator the engine is overcooled.
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 happens when the thermostat is in the open position?
When an engine is warm, the thermostat is in the open position. This allows the coolant to flow through the radiator causing vigorous movement. Cold engine test: Start the engine. Time how long it takes the engine to warm up enough to produce heat when the heater is turned on.
What to do when your engine thermostat is stuck?
When an engine is cold, the thermostat should be closed, thus bypassing the radiator. Warm (not hot!) engine test: Open hood and remove radiator cap. Start engine. Observe coolant action. It should be swirling vigorously. When an engine is warm, the thermostat is in the open position.