Hello I have a 2009 a4 with 142k miles that has developed a coolant leak under the intake manifold. The car does not over heat. I have to add coolant maybe once a week. The fluid tends to “pool” just to the right of the thermostat housing in a small “well” on engine block. The thermostat area is not leaking. Looking towards rear of motor you can see a faint trace of coolant under manifold. Any ideas to cause? Parts? Before I take manifold off and wait to repair. Forgot to mention it is a 3.2. Thanks in advance

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