Yellowish green fluid under my car - 2004 Mercury Mountaineer

can be anything from brakes to transmission --figure out what color it is ---blackish brown depending how old = oil //reddish ==transmission /// yellowish = brakes //pinkish green = coolant

Do you have an auto transmission? If so, Audi / VW use a fluid that matches that description. Also, oil with coolant can take that color too. Where under the car does it appear? Get under there and look to see if you can trace to the source. It will require removal of the sound deadening panel that use a special star shape bit. Because the car is so low, you will need to raise the car with ramps. Do not use a jack to crawl under, that is a major safety risk unless supported with jack stands!

Well I am a master Certified Chrysler tech and Chrysler has been using a Clear to yellowish Power steering fluid for many years now. In most vehilces power steering fluid is pretty much standard automatic transmission fluid (thus the red color) The only fluid that that car came with that was green was the antifreeze. There may case where someone has service the power steering system and replaced the factory fluid with an aftermarket fluid which is green tinted in color.. Cant say that working 17 years at a 9 franchise dealership that I have ever seen green power steering fluid, but anything is possibile I guess, Reguardless that is not whats causing the car to not start. I would venture to say that since the power steering resivor and the radiator cap are a few inces from each other that your dad has accidently took off the wrong cap. The clicking when starting is either a weak battery (most likely) or a corroded cable situation at the battery.(possibile) or a defective starter (rare) Try jumping it with jumper cables... Then get the battery and charging sytem checked..
Hope this helps
Sincerely
Roger

The question is what color is the fluid. If it is yellowish and oily its going to be power steering fluid. If its red or or green and watery its coolant the only other thing would be gas or windsheild washer fluid. Check front driverside brakeline as well just to be safe

Hi,
The brake fluid reservior is located on the driver side, toward the back of the car. Look for a white or light yellowish colored plastic tub with a black cap on top. There are some marks on the side showing a minimum and maximum fill level. Make sure to use the correct fluid for your car, and do not use the brake pedal with the cap off.

open the coolant overflow tank under the hood. if fluid is the same color, you have a coolant leak somewhere towards the front which is running along something and dripping off at the back.
if not the same color then open your washer tank and check that fluid for color match. if the same then your washer system has a leak, could be front or rear if it has rear washer

power steering or break fluid. Check pressure in both. If are good take to your local mechanic for a free diagnostic

It is very like radiator coolant. It is typically yellow/green color.
If you smell it, it will have a sweet scent.

Here is a key make sure it yellow
Yellowish /gold fluid -engine oil
greenish/yellow fluid- Antifreeze
red fluid-transmission
Light goldish fluid- power steering
Good Luck

I am guessing that you may have mold (green) in the water coming from your Air Conditioner or from the water channels where the water flows from the car vents to the ground. Usually green is the coolant. Could also be a prankster the poured some lime flavored pop/soda under your car or one leaked in the trunk? Did someone else park there and you are seeing their leaked stuff? Without more info, this is just wild guesses. Where is the leak seen - inside the car? under the engine? floor of a garage? outside in the street? Maybe even windshield washer fluid was that color if it spoiled?