That depends which "coolant" hoses you are referring to. Besides the two main coolant hoses to the radiator, there is a crossover pipe under the radiator, a bypass hose at the thermostat housing, two heater hose assemblies, and two small hoses to the throttle body.
the knock sensor is under intake, must remove intake and it is under two coolant lines.
Not necessary on this vehicle.
Inside the distributor
If you have a 1999 Passat V6, the coolant temperature sensor is located in the lower radiator hose.
where is the coolant temperature sensor located in a 1999 cadillac seville sls?
on my 1999 ford mercury villager its on top of transmission under the van
Next to the fuses under the dash.
How do you change the thermostat in 1999 Mercury Villager
Under the dash to the right of the steering column.
Attached to the back side of the throttle body.
The coolant level sensor is on the bottom of the coolant reservoir located on the passenger side fender well.
Under the dash near the fusebox.