Q: How do I flush stop leak out of engine/radiator?
I purchased a car only to have it continue to run ho and it's full of stop leak. I have spent thousands to repair this car and need to know how to flush the system.
My car has 990000 miles.
My car has an automatic transmission.
Recommended Services
| Radiator Replacement | $353.55 - $1403.40 | Get a Quote |
| Cooling System Flush | $201.32 - $237.92 | Get a Quote |
If somebody has put ’stop leak’ inside the radiator, it will flow through the entire coolant system and has possibly created an obstruction in the heater core or other cooling system component. If you flush the system, it’s possible the ’stuff’ plugging the radiator leak will loosen and create the leak again. If you have not replaced the radiator, this needs to be the first step. I would recommend having one of our mechanics come to your location and replace the radiator and complete a coolant flush; which should resolve your problem.
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
What others are asking
How do I use the conversation mirror?
The conversation mirror is part of the sunglasses holder, and can be used to view the passengers in the rear seats. To access the mirror, open the sunglasses holder, then press it back to the first detent.
Door not latching.
The door seal is known to hit the trim panel on door closure. This can cause high effort to close the door. The fix is to remove the door seal and adjust the panel fold inward and reinstall the door...
Squeaking from front driver's side tire
If the noise is heard when turning it could be the strut tower bushings. These are rubber bushings that ride on a bearing. They insulate the strut from your vehicle and aid in turning. Over time dirt gets between the...
Opinion about the mid '80s BMW E30
They were great cars at the time, but most of them are worn out by now. If you can find a good one, they are like collectors' items now, and they are worth a serious amount of money. Just realize...
Service battery system light? Battery died. CD player has stopped ejecting.
Hi, thanks for writing in. The battery only supplies power to accessories when the engine is not running. As the engine starts, the alternator takes over. So, if the CD player was not working while the engine was running, the...
Check Engine Light is on - code P0405
This code could be caused by the EGR valve (https://www.yourmechanic.com/services/exhaust-gas-recirculation-egr-valve-replacement), the EGR valve position sensor, a wiring or connector issue, or even a problem with the PCM. P0405 is set when the PCM sees a voltage reading below .35 volts....
No hot air inside the cabinet ? Unbalanced air temperature comes from outlets 2010 Toyota Prius
Hi - your symptoms suggest the air blend doors (https://www.yourmechanic.com/question/blend-doors-not-working-properly) in the heater air control box are not selecting the right proportion of heated air. This may possibly be aggravated by an engine that is not completely up to running...
Does timing belt replacement also include timing cover gasket replacement?
Hello Sal, the timing cover gasket would be replaced and included in the estimate with the timing belt. There may be a timing belt kit available which would include coolant pump, gaskets and drive pulleys. Another recommendation would to replace...
My 2012 Chrysler 300 won't run it says it's in drive like it's running but it's not and it won't turn off.
This may be a result of low transmission fluid (https://www.yourmechanic.com/services/transmission-fluid-service) or potentially a faulty transmission control module. A faulty transmission control module may cause a delay in acceleration or erratic shifting of gears. The transmission control module has various sensors...
Related articles
A Buyer’s Guide to the 2012 BMW 335d
Of Of all of the BMW 3-Series models available in this model year, the 2012 BMW 335d is one of the most powerful and subtlest on the road. This 4-dour sedan may look mild-mannered enough, but under the hood it’s...
5 Essential Things to Know About Luxury Vehicles
There’s There’s something to be said about the looks and offerings of luxury vehicles, but appearances can always be deceiving. If you’re considering buying a luxury car, there are a few things you need to know before you make your...
How to Purchase a Pre-Owned BMW
BMW BMW offers a wide selection of luxury cars. In many circles, owning a BMW is a sign of success. While most balk at the price of a brand new BMC car, pre-owned models provide a viable alternative if you...
Browse other content
Maintenance
Cities