I have no heat unless I rev up the engine

Car: Audi, A4, 1996 - Back to Fix-It - Audi Repair Manuals

Q.Checked the heater hoses going to the heater core. One is warm the other is cold at a idle. There are no leaks in the cab. The coolant was just changed along with thermostat and water pump. Any suggestions?

Answer Does the engine temperature gauge get up to normal operating temperature? It should be straight up, or half way. If not the thermostat is stuck open or opening to soon and must be replaced. This is a COMMON occurrence on this year model.
If the engine temperature is correct your symptoms are consistent with a plugged heat exchanger or heater core. There is NO valve in this system to restrict coolant flow to the heater core
The amount of flow going through the heater core is very hard to determine and the apparent resistance can be deceiving. If you try and remove the heater hoses and check for flow, you will not be able to.. >> login for more

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I have no heat unless I rev up the engine