What could be the cause of oil in the radiator overflow reservoir? I just bought a 2002 Toyota Echo and after driving it about 350 miles noticed the coolant low temp. light was staying on longer than it seemed like it should. Checking the coolant level I found oil in the overflow reservoir. It seems to be almost pure oil, no anti-freeze. Will take it to a mechanic tomorrow but would like to know what to expect.
An expert who has achieved level 3 by getting 1000 points
An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.
An expert that got 20 achievements.
An expert that got 10 achievements.
Re: oil in the radiator overflow reservoir
Either a leaky head gasket or someone put oil in the overflow, it happens, clean it out drain the coolant from the entire system and refill with new long life antifreeze, also add a can of good radiator sealer.
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need. goodluck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
probably either the intake manifold gasket, or a head gasket has failed allowing cylinder compression to escape into the cooling system and boiling the coolant. also look for milky oil(water in the crankcase), or for oil in the coolant system(rainbow sheen on top of coolant in the radiator, or overflow reservoir).
It could be both your thermostat and water pump, it could also be an air lock in your cooling system. One way or another, I think pressure is building up in part of the system because its not circulating properly.
When its cool, take the top off your reservoir, give the bottom hose to your radiator a good few squeezes, see if the water goes down a little, if it does, you moved something on and probably cured it.
If not, run the engine up, to get it warm and bleed off any air in the system. (Assuming there are bleed taps in the system)
If that also does nothing, I reckon its your water pump. And if your changing that, I'd suggest changing the thermostat at the same time.
One thing to check is for coolant getting into the oil, which would indicate head gasket failure. Check oil dipstick and/or underneath of oil cap for a frothy brown/tan look to it. If so, do not drive the car.
Also check coolant reservoir for a leak. Evaporation is suspect, but maybe not to the point you are describing. Check coolant reservoir cap, as well as radiator cap.
If you need Illistration I Can Email it to you Im at rejakwilson @ aol.com
CAUTION: Do not mix Standard (green) Coolant with Extended Life Coolant (orange). If mixing occurs, drain engine cooling system and refill with originally equipped coolant type. If this contamination occurs, the service change interval on Extended Life Coolant will be reduced from 6 years/150,000 miles to 3 years/30,000 miles.
Drain radiator until engine coolant is out of degas bottle. Disconnect radiator overflow hose and engine coolant vent hose at degas bottle.
Remove power steering oil reservoir retaining screws and position power steering oil reservoir out of the way.
Remove degas bottle return hose and clamp. Remove degas bottle retainers and remove degas bottle.
Position degas bottle in vehicle and install retaining screw and nut. Tighten retaining bolt and nut to 9-12 Nm (80-106 inch lbs.)
Connect degas bottle hose and clamp to degas bottle.
Position power steering oil reservoir onto degas bottle and install retaining screws securely.
Connect radiator overflow hose and engine coolant vent hose to degas bottle.
yes, not having an overflow reservoir for your radiator will cause you to lose water. As your engine warms up the water expands and creates pressure in the cooling system. When the pressure reaches a certain point(usually about 15 psi.) the radiator releives the pressure by releasing water into the overflow tank. When the engine cools back down the water shrinks pulling water back into the radiator from the overflow. If there is no overflow, the everytime the engine warms up on a drive water will be lost and not recovered on cooldown.
if the radiator cools properly and engine does not overheat, I would probably change the antifreeze solution but not the radiator, does it leak? test its cooling capability by running the engine until the cooling fans operate. changing the fluids is a good idea, also lube driveline and suspension
I also recently bought a 2002. According to the owner's manual the blue light does not indicate a problem unless it stays on after the car warms up. If you have an automatic it will not shift into fourth gear until the coolant warms up at which time the light should go off. Have only had the car for a week and notice the blue light goes off after a mile or two of driving in temperatures in the teens to 30's. I don't know how much outside temp affects it.