![]() ![]() Tom: Engineers realized that the top of the engine really needs the most cooling. The hot coolant comes in the bottom of the radiator, gets pumped to the top, and then goes back into the top of the engine. Ray: But now, on a lot of cars, the flow HAS been reversed. For ages and ages, the hot coolant came out of the top of the engine, through the open thermostat, down through the radiator, and then out the bottom of the radiator where the cooled water went back into the bottom of the engine. Tom: For traditional, old, American cars, you're right, Tim. Ray: We're enclosing a good set of rubber gloves for your roommate, Tim, because he's going to have some serious dishpan hands. What's the answer? If he's wrong, he has to wash my truck once a week for a year. We're talking about good old American V8s here, not a little Subaru. I say it's the other way around that the water runs into the radiator at the top, and out the bottom. He says that the cooling system runs water from the engine to the lower radiator hose, then up through the radiator and out the top radiator hose. He thinks he knows everything about cars, and I DO know everything about cars (just kidding). My roommate and I have a serious bet going on. Drivewire carries all the OE genuine top brands of thermostats for your car at discount prices. A faulty thermostat can even cause your car to fail an emissions test. A thermostat that does not open or open all the way can cause knocking or pinging when accelerating and overheating. An open thermostat can result in low heater output, overheating and poor fuel economy. ![]() The Subaru thermostat is a very critical part of the cooling system that can cause many symptoms and problems. Under normal operating conditions with a fully warmed engine, the thermostat will be completely open. As the Subaru engine coolant continues to increase, the thermostat opens more in relation to the heat of the coolant. As the Subaru coolant increases in temperature the paraffin element causes the valve in the thermostat to open slightly, allowing some of the coolant to flow thru the Subaru radiator. This enables the Subaru engine to warm very quickly. When the Subaru engine is cold, the thermostat stays closed and keeps coolant from flowing thru the radiator. The Subaru thermostat is the engine cooling systems temperature control. You can purchase Subaru thermostats in varying degrees based on the environment or the type of driving you are doing. Cooling system is rated in degrees that reflect the typical cooling system temperature maintained by the thermostat. ![]() The Subaru thermostat can be located on the top of the engine, in the outlet going to the radiator and some may be mounted towards the bottom of the engine near the radiator hose inlet to the engine. ![]()
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