Q: What does flushing car fluids mean?

asked by on

What does flushing car fluids mean?

Flushing car fluids generally refers to having a sealed systems fluid completely replaced usually with the use of a machine that is capable of complete fluid exchange. Systems that are generally flushed in our modern vehicles include the coolant system, brakes system automatic transmission, engine, power steering system, fuel injection system, and sometimes even the AC system.

This process is generally done with the use of a machine designed to remove the original fluid in the system, pass fresh fluid or a cleaner through the system and replenish the proper fluid when finished. Flushing can also be done on fuel system lines in the event of a contaminated fuel system. This helps to remove the old fluid which may have lost its lubrication or other properties and removes scale, dirt, and debris, which can affect proper operation and cause further damage. Flushing the system to remove debris would be similar in concept to clearing a partially clogged drain. Using the pressure to force the dirt and old fluids out of the system and replenishing the vital new fluid will help to ensure proper operation and extend service life. For example, coolant over time becomes acidic and corrosive and turns into an electrolyte. Along with losing the lubrication properties which help to keep seals soft and prevent rust and scale, this chemical change can cause actual engine damage to the cylinder walls, head surface, water pump or radiator. In the case of the transmission, the fluid provides the pressure needed to apply the internal clutches for gear selection and lubricates to protect from dirt and wear. Over time, due mostly to heat, these additives will break down and the fluid will lose its ability to protect the internal parts. Flushing restores the fluid and cleans the system. Think of it like a detox cleanse when starting a diet. The key to any vehicle’s long life and lower cost of overall operation is proper maintenance. Flushing should be a vital part of this process.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. What does flushing car fluids mean?

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

Get a quote

What others are asking

Q: Need to have transmission fluid flushed after I used the wrong kind

CVT and automatic transmissions function differently and have different transmission fluid needs. Only approved fluids should be used in the your automatic transmission. The vehicle may function normally but may wear much more quickly with the wrong type of fluid....

Q: Q: Should I change my transmission fluid?

This may be a sign of low transmission fluid or a faulty transmission control solenoid. As you know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission...

Q: Brake sinks slowly while at stop

The most common cause for the brake pedal to sink slowly to the floor will be the brake master cylinder internal pressure cup failure. The seals may be worn or sludged up from old dirty brake fluid. I have...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.