Audi A6L hasn't been hot for more than ten minutes.
1. Insufficient coolant, reason-engine water circulation system components are damaged due to insufficient coolant, and the interface or cylinder gasket leaks. This makes the heater duct not hot, because only a small amount of coolant is circulated or not at all. Solution-In order to ensure the normal water circulation system of the engine, it is only necessary to supplement the coolant. If there are other problems, please solve them first, and then add coolant to the normal level.
2. Thermostat, reason-Thermostat was damaged due to high water temperature or normal open position, which kept the water circulation of the engine in a large cycle and was removed from the last maintenance. In addition, the external temperature is low, the heat dissipation is good, the engine water temperature is difficult to rise, and the warm air is not hot. Solution-Install or replace a new thermostat.
3. Warm water tank and heat exchanger. Reason-Part A automatic transmission models are equipped with a heat exchanger on the gearbox, and engine coolant enters the warm water tank through the heat exchanger. If the heat exchanger is blocked, the warm air will not be hot. B There are also some models of exhaust ports near the heating box. If the exhaust is not complete, the heater will be tepid. Solution-If there is an exhaust port, exhaust it first. If you can't touch two warm water pipes by hand and the temperature difference is large, you can directly blow the water tank or heat exchanger with a water gun or an air gun.