A plugged heater core slowed the fluid flow to a level that seriously affected the heaters ability to provide warm air in the cabin. The entire dash, console, and steering has to be removed to R&R the heater core.
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Newest reported Audi problems
Vacuum leaks, oxygen sensor failure, and catalytic converter efficiency faults can cause the Check Engine Light to illuminate.
When try to re-start engine when the engine is above 200F, it cannot be started. You have to wait till engine cools down under 200F to start it again. The problem is the bad coolant sensor, can be replaced easily.