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.

A: It is not advisable to mix coolant types. O...

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

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: Intake manifold stuck open

I'm guessing that you mean your throttle body is stuck open? These vehicles are known for having problems with their throttle bodies. I would ask for help from one of the mechanics at YourMechanic to come and examine your vehicle...

Q: Antifreeze leaking into vehicle

If antifreeze is entering the cabin, the problem is the heater core or piping to the heater core. The heater core is inside your dashboard and if it is leaking, antifreeze will run downward onto the floorboards and eventually leak out...

Q: I have oil leaking from my car I had a estimate done on it last week and told me to replace the whole crankshaft.

Hi there. With a car of this age, it should be highly unlikely that the car would need the crankshaft replaced as this is typically something that does not fail unless under catastrophic conditions. There are a number of places...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.