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Before you change the pump make sure it is not something as simple as a fuse replacement. I was told that if the wipers still function then the system fuse (usually a 30A fuse) was not blown.
Here is step by step to get at washer pump
1. Remove drivers side front wheel
2. Remove inside fender wheel well covering (about six to eight screws)
3. Upon removing cover you will note to left of wheel the plastic washer reservoir. Located behind this reservoir are the pumps.
4. Unscrew reservoir bolts and pull reservoir loose from grommet at top of fill container. Also at this time you can now disconnect the water level sensor plug that plugs in to the left side of the reservoir
5. Pull reservoir out and you can now locate pumps. If the pumps are bad, this is an easy fix of disconnecting the electrical connects, disconnecting the water lines and pulling th pump out of the reservoir fitting.
6. Replace new motors and reassemble in reverse order.
Funny that they changed the temp guage sensor....known problem on pre-2001 Audi TT and VW engines. Maybe yours was an early build 2002, so they helped you avoid a future problem.
As for the air flow, another known problem is the MAF (mass airflow) sensor. Don't panic, as this is a do it yourself job. Very likely problem if you ever installed a K&N type aftermarket air filter. These oiled filters cause buildup on the sensor. Free fix is to take the sensor body off (its the big ring/pipe coming off the air filter box before the rubber air intake hose) and clean the senor with isopropyl alcohol. Sensor body comes off by loosening the hose clamp on one end, and two screws into the filter box on the other. Don't forget to release the wiring harness plug by gently releasing the tab with a flat head screwdriver.
If your not comfortable with the cleaning, just find the MAF part on-line...about $200 bucks for a new one from Bosch. Very easy to do it yourself and a common failure point on the Audi.
For those still having the coolant sensor problem, also easy to replace yourself....about $10 bucks with a new o-ring.
Like GURU said, a code reader tool will tell if you have these problems, after the engine light comes on.
Disconnect the line at the pump and see if there is adiquate flow and pressure. If so reconnect and check for a kink in the line. If not try and back wash the system, meaning disconnect at the pump and force the water in the opposite direction from the lines in an attempt to dislodge any thing that may have gotten stuck in the line.