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Park your vehicle overnight on a clean patch of pavement or a large, clean piece of white paper.Either tape some sheets of paper together or buy a roll of plain white commercial wrapping paper. Newspaper is too absorbent and can change the color of the stains.
Place marks on the paper.
Show where each of the four wheels is resting, and indicate the front and rear ends of the vehicle.
In the morning, move the vehicle and look for small puddles or traces of liquid on the ground or paper.
Touch and smell each puddle or trace of liquid.
Here's how to decipher the evidence:
If it's clear, watery, and under the air conditioner: It's probably normal condensation if you've used the air conditioner recently.
If it's black or dark brown, greasy, and located under the engine area:It's probably oil. Figure out which part of the vehicle was over the spot. Look under the hood around the oil filter and the engine and under the vehicle for leaks around the oil drain plug, the crankcase, and the oil pan below it.
If it's thick, black or tan oily liquid: Gear oil may be leaking from a manual transmission, the differential, an axle, or the steering gears. Any of these leaks needs immediate attention.
If it's red, pink, or reddish-brown and greasy and you have an automatic transmission: It's probably transmission fluid. Check the transmission dipstick, and if the level is low, top it off with the proper transmission fluid. Then check the dipstick again in a day or two. If it's low again, have a professional check the transmission to make sure that the seals are intact.
If it's watery or slippery; green, red, blue, or yellow; and is coming from under the radiator or engine: It's probably coolant. Check the radiator, pressure cap, engine, and hoses for leaks.
If it's oily; pink, red, or clear; and you find it toward the front bumper (usually on the driver's side): It's probably power-steering fluid. The power-steering system is sealed and shouldn't lose fluid.
If it's a light-colored or clear fluid: It may be brake fluid. Even if the leaks have dried, the stains should be visible. Leaky brakes are too dangerous to leave unattended. Have a professional repair any brake fluid leaks immediately.
If it smells like rotten eggs: It's battery acid. Avoid getting it on your hands or clothes and have the battery replaced.
If it smells like gasoline: It probably is! If the smell is coming from under the hood, check around the fuel pump and the fuel injectors - or the carburetor if your vehicle has one. If the leak seems to be under the center of the vehicle, check the fuel lines. If it's under the rear end, check the fuel tank.
There is little I can think of that is going to be a clear liquid in your car. The only things that I can think of 1. Condensation coming from the drain of your A/C unit(most likely), 2. If it is a small amount and it is coming out of the tail pipe, it is water. The catalytic converter turns most of the unburned gas from your engine into water.
Automatic transmission fluid is RED, Antifreeze is Green in Nissan products, Brake fluid will be a semi clear liquid with a brownish hue to it. Manual transmissions use gear oil which is a golden color. Engine oil, depending on how well the car has been maintained, will be a light goldish to a black.
I hope I have answered your question.
I would first try putting cardboard underneath the vehicle when you park it. This should give you an idea of where it's at least coming from then that might zero in to what it is. Does the liquid have a smell to it?
May be engine coolant, transmission oil, or even washer fluid. Seeing how I can't see it, I assume you've checked you windshield washer fluid color to see, just in case, as well as a look in coolant return bottle when engine is cool, should let you compare what you see on floor. With that said, if your not sure, it should only take a minute for a repair shop to identify it for you, if you can guide them of rough idea where you see it under car, such as front part, mid, back, and how far under. Letting it go too long, may cause bigger problems.
Do you have a/c in the truck? Just wondering if it's water from the condenser. How much is under the engine? Are any fluids going down and have to be topped off occasionally? Power steering and auto trans fluid are pink, coolant is green, so the only 2 possibilities would be engine oil or brake fluid. Post answers to above for further help.