Skip the auto shop - Our mechanics make house calls

Q: I added green antifreeze to my car when it had red in it before. Would mixing the two cause a problem with the intake gasket?

asked by on

Impala high miles. Was low on antifreeze, running hot. Only store open late only had green antifreeze. Filled antifreeze (had red in before). Now intake manifold gasket is bad. Would mixing the two antifreeze cause this?
My car has an automatic transmission.

It is not advisable to mix coolant types. Over time, a chemical reaction happens between them. This can cause corrosion issues, and the mixture can begin to gel, clogging small coolant passages in components such as the radiator, intake manifold, or heater core. If these components become clogged, the coolant will not circulate properly and can cause overheating issues. If your vehicle is older with high mileage, odds are the intake manifold gasket was in poor condition already.

Mixing coolants would not have caused an immediate failure of the gasket but could contribute to it over a long period of time. If it was running hot and low on coolant, odds are the gasket may have already been leaking and got worse over time.

I recommend having a certified technician, such as one from YourMechanic, come to your location to replace the intake manifold gasket and flush the cooling system, refilling it with the correct coolant as soon as possible.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • I added green antifreeze to my car when it had red in it before. Would mixing the two cause a problem with the intake gasket?

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: Checking the engine by taking the intake manifold off on the Chevy 350 V8

When you pull the intake manifold off, you're going to see all the gaskets in there, and you can look at the valves. You can see if the valves have carbon build-up and if they need cleaning. There are quite...

Q: Car wont start - 2001 Nissan Sentra

Hello there, a variety of faults will cause your 2001 Nissan Sentra to overheat, be low on coolant, and now have starting trouble. The first problem is the vehicle being low on coolant, either there is a leak in the...

Q: Need a head gasket replaced.

I would not recommend driving the car until the oil head gasket problem is fixed. To repair the head gaskets on that vehicle may be more expensive than the car is worth. I would have a qualified technician replace the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...