SOURCE: Hot air blows but cools down in 15-20 seconds.
You likely have a restriction in the heater coolant hose circuit - perhaps a coolant control valve not fully opening, or a kinked hose.
Insufficient coolant volume is flowing to keep the heater core hot.
Try back flushing the heater core system with a garden hose to check flow.
SOURCE: remove bateries from audi q7 remote and required disassembly.??
- Buy a CR2032 3V battery
- Pry open the battery cover on the remote using a flat head screw
driver or a table knife. The pivot point is the chain ring holder opposite to the key.
- Replace battery
SOURCE: 2001 Audi A4 heater blows
The EVAP core (the part that cools the air) is similar to a dehumidifier. As the outside air passes through the EVAP core it removes the moisture from the air. The moisture collects on the EVAP core and eventually drains out of the EVAP drain which is usually under the passenger side of the car. This is normal any time the a/c is on.
I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa
SOURCE: 2001 audi a4 1.8 turbo wont blow hot air , blows
Sounds like something is wrong with your climate control
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