A water-based fluid used to remove heat from the engine. Also see cooling-system for related components such as the radiator and water-pump.

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Flushing built up Rust and Mineral Deposits in Cooling System

The previous owner ran tap water in the cooling system for few years, and we have very heavy, mineral rich water locally. When I bought the car about six months ago, I drained the water, and put a ...
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2002 Mercury Sable with wrong coolant in it

My wife's 2002 Mercury Sable we purchased a year ago has red coolant in it. I found the owner's manual online and it recommends Ford Green or Ford Yellow. Will this coolant damage her vehicle? Can it ...
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233 views

Reason for oil like substance in coolant reservoir and under radiator cap?

I have a 96 Ford Ranger 3.0. There is an oil like substance in the coolant reservoir and under radiator cap. Oil is clean with no loss. Transmission is idling fine. No overheating of cooling system. ...
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1996 mazda 626 leaking coolant

My mazda 626 was leaking coolant. I replaced the radiator for there is clearly a hole on it. It worked fine for about a month. Then I see some leakage again. And this time it is around the right side ...
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Audi A4 1.6 2000 Coolant level sensor flashing

I have a problem with the coolant level sensor. After a minute of driving the temperature sensor on the car starts flashing and also alerts with beeping. Of course the coolant tank level is normal. ...
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1997 1.8t Audi Quattro - using coolant

I have an issue with my 97 1.8T Quattro using coolant. I've checked for external leaks and can't find any. The engine oil is still clean. Has anybody had this issue before? Is it possible for it ...
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Is it necessary to run the engine after adding radiator coolant or only when draining?

I recently did a timing belt/water pump change on my own. When I changed the water pump i drained the coolant, and according to my mechanic, I blew my radiator by not running the engine with the cap ...
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2001 Pontiac Grand Am - Oil in coolant

I just bought my car from a owner I noticed there was oil or what looks like oil in the coolant there is no coolant in oil and car doesn't over heat. It's a 2001 Pontiac Grand Am with 230,000 miles ...
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ISUZU CUBIC mixing oil in coolant

ISUZU CUBIC - CITIBUS ENGINE - 6hh1, 8300cc, 6 Cylinder, No Turbo I have this Isuzu with the above description. It is mixing oil and water coolant. I did not find water in the crankcase but found oil ...
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Renault/Dacia Logan 2014+ engine temperature indicator?

the Renault/Dacia Logan 2014 and above have indicators like this: As you can see, the dial at the right has the total mileage and the fuel indicator only. I'm wondering if there is an indicator for ...
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Car is heating while Coolant Temp Sensor is normal

I bought a BMW 318i and the car heated twice so far while the coolant temperature sensor is normal. If we exclude the possibility that the sensor is malfunctioning, what problem would cause the ...
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Car wouldn't start apparently due to weak battery, but did start after I added coolant

I know there is a leak somewhere in the cooling system of my 1996 mazda 626. It is an old car, and I just keep adding coolant every two days. This morning, I was not able to start the car. It looked ...