Q: Coolant keeps magically disappering...

asked by on

No leaks are present underneath the car. I took it to NTB and they did a pressure test, no sign of a leak. They replaced my upper radiator hose and did a coolant flush. I thought all was fixed on my car until about 2 weeks later, I was driving and my cars' temperature went all the way to hot and my air conditioning instantly stopped. I pulled over and waited for the engine to cool off and looked at coolant level and again, all of my coolant was gone. Where is the coolant going if there is no leaks?? What may be the issue with it magically disappearing??

My car has 95000 miles.
My car has an automatic transmission.

There is a leak, it just hasn’t been found yet. I would begin by having a close look at the radiator cap - a visual inspection and a pressure test. The cap is so inexpensive I would just replace it with a new one.

Pull the dipstick and inspect the oil. Remove and look at the oil fill cap and inside the valve cover. If you see any foaminess or latte-looking stuff, you are seeing water (coolant) in the oil.

Your Aveo should have a pressure tester put on the cooling system cold, and then start it and let it warm up while observing any pressure changes and looking for leaks. Let it run for awhile with pressure tester on it.

Someone will need to go under the car while its running, warmed up, with pressure still on the system, and inspect closely for leaks. If no external leaks are found, then coolant is leaking internally into the engine. This can happen through a leaking head gasket or cracked head. A head gasket test could also be performed to test for the presence of combustion gasses in the cooling system.

If you want to have this checked, a certified mechanic from YourMechanic can come to your home or office to diagnose your coolant leaking problem and help you move forward with repairs.

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. Coolant keeps magically disappering...

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: Car surges and wants to die while driving

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

Q: Q: Car won't move

Hello there. Lack of fluid is the number one cause of transmission failure. If the transmission went without fluid for too long, it could be severely damaged. The only way to tell if a transmission is severely damaged without disassembling...

Q: Okay one day i did a burnout in my 2010 crown victoria, then i heard a loud noise. After my car wouldnt move at all. Is it my Rear

The noise and subsequent failure to move in gear could signify a major component failure in the drive axle, transmission, or differential. To determine the exact fault, please request a no movement in gear diagnostic. If you request that service,...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...