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First time you might check the thermostat operating.
Heed of antifreeze coolant temperature!!! The thermostat location for a 2000 Audi A4 1.9 TDI is on back of the alternator at the bottom side of the bracket.
IMPORTANT NOTE: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking: 1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!! 2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg. 3. The thermostat opening temperature is 87 C deg. 4. If the hose is already warm the thermostat is out of order.
Thermostat location, Part number: 044121113, in german - "Kuehlregle" (Price around $25):
Important note: Always replace the thermostat round seal, position 7 in the above picture.
hey i got a audi a6 there is a hose clamp behind the bumper cover you'll have to look under the car in that corner. see if the hose came loose or the clip cam off of loose. you may have to remove your bumper cover to have better access to the hose.
the clamp is definitely not tight... tighten it first and see if there is a change in heat also refill what you lost in antifreeze also see it the hose itself is not leaking if so replace both to be sure and possible flush the heater core while your at that point .
I would start with the cylinder 4 spark plug and make sure it look good and is firing correctly. After that I would look either at the final coil, ignition module and then o2 sensor. These problems are so hard to diagnose and are trial and error so much of the time.