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Can I top up coolant with tap water?

Author of the blog (work in a car repair shop)
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Can I top up coolant with tap water?

If your coolant level is too low (below or near the lower mark), top it up using a 50/50 mixture of water and antifreeze (for normal driving conditions), or pour pre-mixed antifreeze straight into the reservoir. You can use clean tap water in an emergency, but antifreeze should be added as soon as possible.

Can You top up coolant with tap water instead of antifreeze?

You will need to get the antifreeze right before too long as the antifreeze also contains corrosion inhibitors which most engines need. If you are just topping up because it's a little low 100% tap water will be fine. Yes it will drop the coolant/water ratio but it will drop it from 33% coolant to 32.99% coolant.

How do you top up the coolant?

I would top it up with some G12++ coolant mixed 50:50 with water. I tend to use deionised water as it's cheap and readily availble just to be safe.

Can you use tap water for cooling?

Tap water has mineral deposits in it by nature. You can’t put these minerals in your cooling system without causing problems down the line. When tap water is repeatedly used in your cooling system you will start to get a buildup of calcium and magnesium.

Can You top up the radiator with distilled water?

If not mistaken most mechanic will simple use tap water to top up with radiator. They will also use them for your battery. You can either top up with coolant or distilled water but before doing you have to check the the radiator water/coolant ratio with anti-freeze PG or EG hydrometer.

Below you will find two interesting articles on a similar topic 👇

How do I know if my coolant is circulating?

What should you do if your car has low engine coolant?

Tired of looking for a video for your question?

Video Answer below 👇

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