The thermostat housing is located on the passengers side of the engine block, behind the timing belt.
On a 1993 Audi CS 100, the thermostat is in the engine block. It is under the housing where the upper radiator hose is connected.
You will find the thermostat behind the cover where the thick black hose from the top of the radiator meets the engine.
I am not familiar with the Audi, but on most cars, the thermostat is at the point where the top hose leaves the engine to go to the radiator. A bad thermostat can make your car overheat. If it has not been changed since 1992 it should have been changed long ago.
It locks the rear diff, thats all
The Audi 100 CS typically came with a 4-speed automatic transmission. Some models might have offered a 5-speed manual transmission option. The specific transmission type can vary based on the model year and market, so it's advisable to check the specifications for the particular version in question.
The temp sensor switch is located on the right side of radiator ,at the bottom.
You can get a starter rebuilt kit for an 86 Audi 4000 Quattro CS at auto part stores. You can also check with local salvage yards.
If cs stands for centisecond, then there are 100 centiseconds in 1 second, so divide by 100. 393 cs = 3.93 seconds.
Replace the thermo sensor...
100%
the instrument panel deos not work all the gauges on my 1988 Audi 5000 cs
The centi- prefix means one hundredth (1/100) → 157 cs = 157 × 1/100 s = 1.57 s