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The 2001 Audi A4 has 20 valves.
The 2001 Audi A4 has an inline 4 engine.
The 2001 Audi A4 is a gas-powered vehicle.
The 2001 Audi A4 has a 5-speed manual.
The 2001 Audi A4 has double overhead cam (DOHC).
The height of the 2001 Audi A4 is 4 ft. 7.7 in. (55.7 in.).
The 2001 Audi A4 is 14 ft. 8.7 in. (176.7 in.) long.
If its the 1800 20v the thermostat is located on the back of the cyl head up at the bulkhead. Follow the top rad hose until it connects to head, this is the stat. This is not an easy task for an amateur mechanic.
The 2001 Audi A4 has 38.2 in. of front head room.
The 2001 Audi A4 has 54.7 in. of front shoulder room.
The 2001 Audi A4 has 41.3 in. of front leg room.
The 2001 Audi A4 has 33.4 in. of rear leg room.