Q: oil light came on and accidental dumped 1/2 quart of oil in the rad before I realized it. Siphoned off a little more than a 1/2 ga

asked by on May 03, 2017

Accidentally put a half quart of oil in the Radiator. Siphoned to a 1/2 gallon of the now mix then put back new coolant. Drove the car down to the mechanic ( 10 miles) ran fine. Explained what happened and asked him to flush everything. He flushed it three times until no sign of oil in radiator. The problem now the dash warning light comes on after 10-15 mins of idle run time stating the engine is overheating , shut down. The dial dash gauge shows normal temps. Your thoughts?

My car has 85000 miles.
My car has an automatic transmission.

Car is overheating Inspection $94.99 - $114.99 Get a Quote

Hello, thank you for writing in. If you did not get all of the oil out of the radiator before you started the vehicle, that oil is now contaminating the thermostat, water pump, and the engine cooling pockets. Even with several flushes, these components may have been permanently affected. Considering the check engine light is on, you want to know what it is trying to tell you. Have the vehicle scanned for codes, as it may tell you what sensor or component is having issues. Considering the overheating issue, it is possible the thermostat is not opening due to contamination, the water pump is not pumping fast enough, the cooling passages in the engine which fill with coolant are clogged, or that the radiator is clogged somewhere. Only further inspection will tell. For help with testing, contact our service department to schedule an appointment.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Belts squeal when starting, turning, and going in reverse.
This could be just a simple belt adjustment since you have multiple belts on your car. I do not see a belt issue when going into reverse but turning could be the power steering belt is loose. I would recommend...
Key stuck in ignition switch
I believe the part you might be referring to is not the ignition switch but rather the lock cylinder. The ignition switch as an actual electronic switch located further down the steering column on your vehicle. The lock cylinder is...
I'm getting 8.9 mpg in the city and around 12 mpg on the highway.
Hello. If they replaced your piston rings and the problem has persisted, then it is likely that the problem was not related to the piston rings. Most fuel issues are related to engine performance or fuel system problems. A tune...
Brake dust
Asbestos was, and in some cases is still, used in the brake lining and clutch materials on many modern vehicles. It offers good strength, temperature, and chemical resistance and is cheap compared to other materials that are used for the...
I changed the brake pads recently, there is now a knocking sound when applying the brakes
You are hearing the brake pads moving up and back in the caliper bracket. This is caused by the front rotors being warped, and it is also possible that the pads' anti-rattle clips were not installed correctly. The rotors should...
Battery saver light on but diagnostic check by mechanic shows no issues and the warning started appearing after new battery instal
Hello, thank you for writing in. There are parts of the charging system, like the alternator output, that are monitored directly by the computer with sensors. However, there are enough sensors in the system, the aspects that are not directly...
Very bad oil leak. I put 5 quarts of oil in my car before going out of town. After I drove about an hour and a half it was gone.
Large external leaks can be readily diagnosed. I suggest you just request an oil leak diagnostic (https://www.yourmechanic.com/services/oil-fluid-leak-inspection) and the responding certified mechanic will get this taken care of for you. It's possible to have multiple leak points on a engine...
I bought a dodge challenge from the auction It start good but I won't move fast it just go slow and when I hit the gas it doesn't
It sounds like the engine computer is in failure management mode. If the check engine light is on then you need to have the codes scanned and then have the codes received diagnosed to see what caused the computer to...
My 2003 Honda CR-V won’t accelerate past 40 mph and it starts to kick at 40. The mileage has dropped the past few months too
If the emissions or check engine light is on, there will be stored codes which might provide relevant clues as to the underlying fault. Among common possibilities for the loss of power you are are describing are throttle body faults...

Related articles

How to Buy a Good Quality Car Fan
If If you live in a city/town that is known for its hot climate, then sometimes the air conditioner in your car just isn’t enough on those long drives. If you need a little extra help circulating the air a...
How to Buy Good Quality Differential/Gear Oil
Gear, Gear, or differential, oil is used to lubricate the gears in a car’s transmission so that it can shift smoothly and easily. This type of fluid is generally used on standard transmissions, whereas transmission fluid is used in automatic...
Symptoms of a Bad or Failing AC Control Module
Common signs include inconsistent cooling, out-of-date software, and uneven air distribution, since the module controls the whole AC system.