In many cases, when it comes to a cold lower radiator hose, there is actually no problem at all! The engine needs to be really hot and almost overheat before the thermostat lets the coolant pass by. Try to flush the coolant system if you have tried everything else. This, together with a leaking head gasket, can create a lot of mess inside the coolant system. However, if someone ran your car without coolant and just water, it could have created a lot of rust inside the engine. This is not very common, though, because the main coolant pipes are pretty big. In some rare cases, the coolant system can get clogged. If you know that you recently changed the coolant, you need to bleed the system properly.Īir in the coolant can also have been caused by a too low coolant level. It may also create an air pocket around the water pump, making it so that it can’t pump water anywhere.Īir in the coolant system can result from a faulty head gasket, or a poorly done coolant fluid change. Air pockets can cause overheating and may stop the circulation from working properly. Air in the Coolant systemĪir pockets in the coolant system are something you really do not want to have there. RELATED: No Heat in the Cabin – Common Reasons & Fixes 4. Remember never to open it when the engine is hot, though, as it is boiling and will splash everywhere if you open it. The coolant level is super easy to check, so open your hood and read your car manual to find the coolant reservoir. A low coolant level may create air pockets in the coolant system and may be causing the water pump to stay in an air pocket. Low Coolant LevelĪ low coolant level can create a lot of problems in the coolant system. The lower coolant hose is most likely the coolant output side of your engine, which means that the hose will stay cold. If the water pump is not functioning properly, the water will stand still in the engine, and no water will get pumped to the radiator. The water pump‘s job is to pump coolant from the engine block towards the radiator to chill the coolant. RELATED: 7 Causes Why Car Temperature Gauge Stays on Cold If the thermostat is not opening at this time, it may cause the lower radiator hose to stay cold, and at the same time, overheat the engine. Once the optimal temperature has been reached, the coolant water will be let into the radiator for energy dissipation. Regulation of water by the thermostat prevents engine hot spots. The thermostat should be closed when the engine is cold and 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. Engines have a valve-based thermostat that determines and regulates coolant inflow so that the engine operates at an optimal temperature and does not overheat. This is the most common problem when it comes to a cold lower coolant hose. Here is a more detailed list of the six most common causes of a cold lower radiator hose: 1. It can also be caused by airlocks or a clogged coolant system. The most common reasons why your lower radiator hose is cold are a faulty thermostat, a bad water pump, or a low coolant level.
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