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29 votes
Accepted

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 ...
user33191's user avatar
  • 306
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 ...
Nick C's user avatar
  • 28.8k
7 votes

How is it possible to lose coolant, if the coolant system in a car is a closed loop, and there are no leaks?

It's not a totally closed system 100% of the time on most cars that I've seen, but let me explain in detail. The overflow vents to outside air and you can lose some to evaporation over time. The ...
James-Jesse Drinkard's user avatar
6 votes
Accepted

Does Coolant Actively Circulate Through Overflow Reservoir?

It depends on if you're actually talking about an overflow reservoir or an expansion tank. Expansion tanks are a lot more common in this day and age then they used to be, so this may be what you're ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
5 votes

Coolant Reservoir keeps breaking Skoda Rapid

You almost certainly have a blown head gasket. The head gasket seals the joint between the engine block and the engine head. When there is a break or gap in the head gasket, hot combustion gases from ...
MTA's user avatar
  • 6,654
4 votes
Accepted

Why would a blown head gasket burst the coolant tank?

When an engine goes through it's four cycles, one of those cycles is combustion. Combustion creates a lot of pressure, which forces the piston down in the cylinder. Normally, the head gasket helps ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
4 votes
Accepted

Is it okay to add straight anti freeze to an engine?

The reason adding straight anti-freeze to a nearly full system is not recommended is because you will have no idea of the actual concentration. Most manufacturers recommend a 50/50 mix of antifreeze ...
mikes's user avatar
  • 20k
4 votes

GMC Yukon leaking coolant. Wondering where to look

If it is not obvious from where it is leaking, your best bet is to go on a car wash, and clean the engine as much as you can. Leave the car dry, fill up the coolant, and then try to replicate the ...
Alimba's user avatar
  • 405
3 votes

Cooling systems without a drain valve

In general, the easiest way to drain coolant from systems like these is to disconnect the lowest fitting between the coolant hose and the engine block and let the coolant just drain out. Usually, it'...
Bob's user avatar
  • 131
3 votes
Accepted

Where do the intake/outtake tubes go on a motorcycle coolant reservoir?

You plug the tube from the radiator into the coolant reservoir There are two plugs on the coolant reservoir Intake Vent Typically, the intake will fill from the bottom of the reservoir and the vent ...
DucatiKiller's user avatar
  • 32.9k
3 votes
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Excessive Coolant Expansion with No Overheating

The first thing I look for when we see overheat at cruise speed but not at idle is poor heat transfer through the radiator. The heat load at idle is much lower at idle than cruise. Fan generated air ...
Fred Wilson's user avatar
  • 11.6k
3 votes
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How often to put water in coolant

Firstly, if your coolant is draining every week, then you have a major leak somewhere, and I'd recommend you get that fixed first - otherwise you may find that you run out during a journey and ...
Nick C's user avatar
  • 28.8k
3 votes

Am I losing coolant during driving?

Assuming that there was enough coolant in both the engine block and the radiator to start with (on average cars can store near 5L in each), if you're losing that much coolant at that rate, you are ...
8bitjunkie's user avatar
3 votes
Accepted

Where is the coolant reservoir on my Nissan Caravan 1995?

The coolant reservoir is located directly behind the driver's seat under the carpet (not in the floor, but in the raised part). Pop open the carpet, take out the black screw, and slide out the metal ...
Steely Van's user avatar
3 votes

Does Coolant Actively Circulate Through Overflow Reservoir?

An expansion tank is a pressurised tank and will likely have multiple pipes connected to the boy of the tank. The tank is part of the circulatory system of the coolant system. The tank will usually ...
HandyHowie's user avatar
  • 25.4k
2 votes

2005 Chrysler Sebring coolant bubbling and leaking

I agree with dlu. I would check the radiator cap next if the thermostat is known to be good and the car doesn't show that it's overheating on the gauge. Here's a picture of the functionality ...
Dalton D's user avatar
  • 1,958
2 votes
Accepted

Reservoir tank boiling over and steaming

I would start by replacing the radiator cap. If you can get the system (and the cap) pressure tested, this will help narrow it down. However, I've seen more than once a cap that tests good on a ...
SteveRacer's user avatar
  • 12.4k
2 votes

Pink residue and overflow around the coolant reservoir

It is probably "normal spill" while driving because the cap on this model seems rather crappy. Because if it overflowed due to overheating etc. the liquid would have come out from the pressure vent, ...
Evren Yurtesen's user avatar
2 votes

Pink residue and overflow around the coolant reservoir

What you are seeing is the residue from coolant. If you look inside the overflow reservoir, you can see the standard "red" Toyota coolant, thus the reason for the red-ish looking residue. Why the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes

How to clean oil from cooling system?

Start by getting as much of the oil as you can out of the header tank, then do a thorough flush of the cooling system. If you have a plastic overflow tank you may want to clean it with a bit of ...
dlu's user avatar
  • 14.5k
2 votes

Poured small amount of oil into coolant reservoir

Shove a garden hose into the plastic jug, and fill it with water such that it floats the oil up and out. Disconnect the small rubber tube, and drain out the water. Replace to the proper level with a ...
SteveRacer's user avatar
  • 12.4k
2 votes
Accepted

Poured small amount of oil into coolant reservoir

If you only poured oil into the overflow, you should not have any issues. If you don't have the tools to drain the reservoir, then take and fold the hose which goes from the radiator to the reservoir, ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
2 votes
Accepted

What problems can a loose radiator cap cause?

Cooling systems are under pressure to increase the boiling point of the coolant. This allows the system to operate efficiently without boiling off the coolant and overheating the engine. A loose ...
CharlieRB's user avatar
  • 9,015
2 votes

Coolant expansion tank issue

Sounds like an air pocket in the cooling system. Take the cap off of the overflow tank and radiator if possible and start the engine and turn the heat on so it'll circulate fully, allow the engine to ...
TRIGGA's user avatar
  • 242
2 votes

Is solid material in the coolant bottle a sign of a problem?

Failure of the cooling system? More like failure of the head gasket. Looks like the exact same material as this post, so it may also be a transmission cooler gasket. Even if the head gasket was ...
Carguy's user avatar
  • 1,992
2 votes

Is it okay to add straight anti freeze to an engine?

2007 6.0 powerstroke diesel ford e 350 van No water just pure concentrated antifreeze I drove this diesel 70 miles per hour in 112 degree weather across the Arizona desert Towing a 10,000 pound ...
Randy's user avatar
  • 21
2 votes

Is it okay to add straight anti freeze to an engine?

In the modern world, it is easy to find premixed bottles of 50/50 antifreeze and water. Unlike a bottle of concentrate, you are fine to top off from a premixed container. It is essentially impossible ...
Bob Cross's user avatar
  • 24.4k
2 votes

Why is coolant in the reservoir boiling?

In addition to the other suggestions, it might be a good idea to check to see if there is any coolant coming from the weep hole of the water pump. If your water pump is bad or on its way out, it won'...
Travis Thomas's user avatar
2 votes

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

If you have a constant need for coolant for replenishment you either have a problem leaking coolant or your engine is running entirely too hot. Which ever the problem may be, you have to keep the ...
user33209's user avatar
2 votes

What state should the car be in when reading the overflow reservoir?

usually the coolant res should be between MAX and MIN mark when the engine is completely cold, but this varies by manufacture, so check your owners manual. Coolant expands when it gets hot, so when ...
Pnelego's user avatar
  • 51

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