Yes. Water on a road causes something called hydroplaning, which makes it very difficult or impossible to steer, brake, or accelerate.
Yes
Since you didn't say what the vehicle is or isn't doing, I can not answer.
No, Hydroplaning is not safe, because when a vehicle is in this condition, there is a "cushion" of water between the tires and the road limiting traction allowing the vehicle to skid out of control.
29.92 inches of mercury = ~406.78 inches of water.
I dont think there is a set amount, it only takes enough water for one or more tires to lose traction with the road.
The EPC on a Jetta is the electronic powertrain control system. This is the traction system of the vehicle that detects if you are on ice or water covered roadways.
6 inches of water No 6 inches of water can cause you to loose traction and hydroplane but 24 inches of water is needed to actually float the car
Inches of water x 0.03613 = psi
The heater control valve (HCV) is a very important component to a vehicle's water cooling and climate control systems. The HCV itself for this application can be found inline to the heater core lines.
It is a good idea to have water with you. What happens if your vehicle breaks down and you have no water?
Hydroplaning is when water builds up under your tires and the rubber loses contact with the road surface, and you have no control over the vehicle. Ease off of the accelerator pedal until you regain control.
The water pump should be along the serpentine belt. Refer to how to change a driveline belt at this site. The water pump should be located to the right(driver side) of the vehicle and it should be at the highest position on that side.