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more than likely have a bad thermostat. easiest way to check if that is problem is let the engine run for at least 5-10 min. after that grab the upper radiator hose with your hand. be cautious because if the thermostat is working properly this hose can be very hot. if it does not feel hot and has no pressure inside hose (you can feel like a garden hose: difference between on and off) then you need to replace the thermostat and gasket or seal. if you do have a hot and pressurized hose than you have a bad temperature sending unit. replace the part. good luck!!!
If you were to take the upper radiator hose off the engine, and look into the resultant hole, you would see the thermostat.
The thermostat on all cars blocks water leaving the engine and going to the radiator, until the thermostat warms up enough to open.
While the thermostat is closed, water circulates through the heater hose, straight back to the inlet of the water pump. This circulation prevents hot spots, distributing the heat evenly to warm the engine up, and also brings that warmed water to the thermostat.
When the t-stat gets hot enough to open, water leaves the engine instead of circulating through it, and that allows cool(ed) water to flow from the radiator through the bottom hose to replace the water that left through the upper hose and t-stat.
The stub that the upper hose attaches to on the engine should be part of a small housing that is bolted to the engine. Removing that housing is how you remove the t-stat.
When you mention the radiator having a hot upper in pipe and a cool bottom out pipe tells me that the coolant is not moving around the engine. This could be down to a water pump not working, blocked radiator, thermostat not opening. The bottom hose should be cooler than the top hose but once the engine is up to working temp which is around 85/90 degrees c for an audi the bottom still should be farly hot to touch. Hope this helps
The thermostat housing is located by grabbing the upper radiator hose, and following it back to the engine block.
The housing that the hose is connected to is the thermostat housing.
Changing the thermostat will fix your problem!
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