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89 votes
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Can salt water be used in place of antifreeze?

Uh ... absolutely not. Salt water will cause corrosion with in the engine block. Salt water is an electrolyte, so will pass electricity which will cause electrolysis. Also, it might be able to handle ...
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30 votes
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What is the point of changing coolant if it gets constantly replaced?

The logic behind replacing the coolant, rather than just topping it off, is to remove impurities. If the reason you have to add to it is that there is a slow leak somewhere, you may get by with just ...
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30 votes
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Why would a mechanic crank heater to maximum

If the cooling system is drained, it needs to be refilled and all air needs to be removed. The mechanic turns the heater on to allow coolant through the heater core to be sure all air is being removed....
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  • 2,622
29 votes

Can salt water be used in place of antifreeze?

Terrible idea. The salt will precipitate and block the radiator fins Of course you know you can dissolve things like salt into water. You probably also know there's a limit to how much it can hold - ...
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24 votes
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Is it Safe to Drive With Low Engine Coolant?

"Is it safe to continue driving with low coolant as long as I continue to watch the temperature gauge? " No, the temp sensor reads coolant temperature, if the coolant gets low enough to be below the ...
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  • 7,940
23 votes

What is the point of changing coolant if it gets constantly replaced?

You shouldn't be constantly replenishing the coolant - if you are, there's probably something wrong with your car! Modern car cooling systems are designed to be almost maintenance free, so you ...
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23 votes
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Switching engine coolant with similar properties oil

There's a very straightforward answer to this question: Water has a much, much higher capability to transfer heat than oil. Even if you were able to overcome the safety and design issues brought up ...
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17 votes
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How to dispose of engine coolant?

Do not pour it down the drain, and do not pour it outside. Coolant is very sweet tasting to animals and they will "drink" it. It will affect both their kidneys and GI tract with potentially fatal ...
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14 votes
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How do I troubleshoot the source of oil in my coolant?

Number one answer is always Head Gasket. The reason is that there are oil and water passages in close proximity, being separated by a gasket (which might just be flimsy paper or rubber, but is often ...
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  • 1,925
13 votes

Why would a water pump be run off of the timing belt?

I think the main reason for this is convenience. It's an easy place to run the water pump. If you ran it out to a fan belt, it would be in the way of the timing belt while doing it, or it would be a ...
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13 votes
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50/50 Coolant Dilution after distilled water flush?

Yes what you presume is correct. Depending on total volume of coolant (different for each vehicle) how much pure AF I put in, anywhere from 1/2 to 1 gallon, then top off with 50/50 mix. It is better ...
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13 votes
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What is this sticker on the coolant expansion tank trying to tell me?

There are two kinds of coolant long life and conventional. Conventional coolant uses silicate salts as a "preservative" per se. They help to reduce corrosion and what not. Long life coolant uses ...
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  • 15.9k
12 votes

How to dispose of engine coolant?

Check your location's laws, but the EPA says it's not hazardous waste. If you're just a DIY-er, you can probably pour it down your toilet. Try and find a recycler first though. In St. Louis, MO (my ...
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12 votes

Is it Safe to Drive With Low Engine Coolant?

If you do not have any leaks, then your coolant is most likely getting burned and/or going into your oil. My guess is going to be a problem with your head gasket or some crack or warping in the head. ...
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11 votes
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Why would a water pump be run off of the timing belt?

Engine safety. If you lose an accessory belt driven water pump, you're likely to keep driving, thinking the "oh, I just don't have an alternator" while you're busy cooking your engine beyond repair (...
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11 votes
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What actually happens when there is not enough coolant in a car engine?

What is engine coolant? Engine coolant is a water and antifreeze solution. Because water has good properties as a coolant, antifreeze is used in internal combustion engines and other heat transfer ...
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11 votes

The purpose of covering the grill during cold weather

I can see a few reasons to do this: The weather in some places will be so cold that even with the thermostat fully closed the cooling system isn't able to warm the engine up to operating temperatures....
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  • 38.9k
11 votes

50/50 Coolant Dilution after distilled water flush?

The coolant capacity of the 2004 TOYOTA COROLLA 1.8L 4-cyl Engine Code [R] 1ZZ-FE is 6.9 quarts. To accurately ensure you have a 50/50 mix in your system after a flush (assuming you actually flush it ...
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10 votes

I've got oil in my coolant but no coolant in the oil - Ford Triton V10 Motorhome

If it has an engine oil cooler, that is most likely the problem, a faulty oil cooler, some are made into the radiator, others have heater hoses running to a remote oil cooler, and a few I have seen ...
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  • 7,940
10 votes

Is it Safe to Drive With Low Engine Coolant?

First, you do need to find out where the coolant is going. There is UV dye that can help with this, and if your car is smoking, that could be a sign that the coolant is leaking into the engine rather ...
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  • 13.2k
10 votes

My Toyota dealer replaced my water pump and failed to replace my coolant

It is unlikely that you would be able to drive a car without coolant for three weeks. I suspect what actually happened is that there was a coolant leak, possibly (probably) as a result of the work ...
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10 votes

Oil Cooled vs Water Cooled

I am assuming that by cooling you are referring as to which Engine cooling systems are better in particular scenarios... Oil-cooled: Traditional Oil-cooled engines are most commonly found in passenger ...
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  • 101
10 votes
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Rusty coloured coolant?

From your description it doesn't seem like oil. As for why it continues to look brown, you probably haven't flushed it enough times. When I had an oil-in-coolant condition on one of my vehicles, it ...
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  • 38.9k
9 votes

Pros and cons of using straight antifreeze?

As explained on this page, using pure antifreeze alone will not do the job: No matter which type or color your antifreeze is, it will transfer heat away most efficiently when blended with the proper ...
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9 votes

Losing coolant fast after just fixing radiator

They may not have bled your cooling system properly As a possibility, if you had air trapped in your cooling system it would expand as the engine approached operating temperature. It would ...
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  • 32.7k
9 votes

Is it Safe to Drive With Low Engine Coolant?

Its not good to run with low coolant, even worse to run with no coolant. Actually it can be quite disastrous (possibilities include blown head gaskets, seized pistons and a number of expensive ...
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9 votes
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Evans Waterless Coolant

Hmmm, about the benefits/drawbacks, I first wanted to complain that this stuff only has a heat capacity of 2.6J/(g * K), while water has 4.2J/(g * K). Water has an exceptionally high value, which ...
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  • 6,997
9 votes

I put Adblu in radiator coolant tank in Peugeot Boxer 435 Onnicar

ADBLU is a mix of uric acid and water, and you don't want acid in your cooling system as it can cause corrosion. It's not a disaster, you just need to drain your coolant out of the system and refill ...
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  • 14.4k
8 votes
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What is this (cooling-system related) part?

This is the heater valve. It's Motocraft part# YG350:
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8 votes
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How does the coolant disappear?

There are only four places (in general) coolant can go missing: Out an external leak and onto the ground Out through the tail pipe getting burnt (turned into steam) because of an internal leak Into ...
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