System which removes excess heat from liquid cooled internal combustion engine. It also helps maintain the engine temperature at a consistent level. The cooling system encompasses the radiator, water pump, thermostat, hoses, heater core, overflow reservoir, and anti-freeze (or coolant).

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3
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1answer
30 views

Only one radiator fan running

Today while adding coolant to my car, I noticed that once the car reached running temperature only the fan on the passenger side had turned on. I checked the connection and that was fine, the fuses ...
3
votes
1answer
221 views

Coolant pressure issue

I am in need of some assistance. I am having a coolant pressure on my 1.8 16v clio. (Renault), coolant, cooling-system, overheating (car maintenance) In that when left to idle and engine gets up to ...
3
votes
2answers
45 views

My 2004 PT Cruiser is overheating

I have tried everything got a new radiator, thermostat, put blocked seal permanent head gasket fix. So I started my car and let it run for 15 minutes, after that I see no antifreeze in the reservoir.....
1
vote
0answers
20 views

2005 Subaru Legacy Outback 3LR g H6

Tried burping radiator with no success. Water boils out but temp gauge reads normal??? 2005 Subaru Outback 3.0 H6.
0
votes
1answer
25 views

cooling system vw

i have a golf 4 gti engine 2.0 for the year 2002,the problem is when i pour water in the container it does not hold water,instead it leaks i can't see where the water is leaking,all the pipes ...
9
votes
3answers
312 views

50/50 Coolant Dilution after distilled water flush?

I have a new (to me) car that it appears hasn't had a coolant fluid change ever, now with 120k miles. It is an 04 Corolla. I am planning on flushing the system with distilled water a few times. But ...
1
vote
1answer
30 views

2006 Chevy impla 3.5

The coolant is hot and bubbling. The car is not overheating. I changed the water pump, the thermo sensor, thermostat and intake gaskets. Not sure if it sealed completely. Wondering, is it the head ...
4
votes
1answer
93 views

Proper operating temp for a 1983 Mercedes 380SL?

My 1983 Mercedes 380SL seems to be running hotter than I like. It settles down at right at 100 C by the instrument panel temp gauge after running at highway speed for 10 minutes or so. When I first ...
17
votes
6answers
994 views

Is it Safe to Drive With Low Engine Coolant?

I have a 2001 Chevy Malibu and have replaced the engine coolant in it twice in the last six months after the low coolant warning light came on, and the light has recently come on again. The climate ...
4
votes
1answer
53 views

Thermocouple vs Thermostat

Why don't modern engines use a thermocouple (electronic temperature sensor) instead of a (wax element) thermostat?
3
votes
1answer
35 views

Temperature gauge between half and 3 quarters?

I have a '98 Oldsmobile Intrigue and after about 20 minutes of driving the temperature gauge is between one half and 3 quarters. I was wondering if is this a problem? The coolant is at the right level,...
0
votes
0answers
20 views

Jeep Cherokee A/C Trans?

The A/C wouldn't blow cold even after freon put in. The condenser and fan replaced but it keeps blowing fuses and still no A/C. Now when I check there are bubbles in transmission fluid now. What is ...
12
votes
5answers
885 views

Should Multiple Coolant Hose Leaks in a Short Time Worry Me?

Right after fixing another problem with one of my cars ( 98 Mazda 626 GF 2L ), I revved the engine and all of a sudden heard the tell tale hiss of a coolant leak: As you can see, this hose just ...
4
votes
0answers
31 views

2005 Pontiac Grand Prix overheating

I have recently bought a 2005 Grand Prix V6 non supercharged. It overheats at idle and in park. I have had my head gasket and head resurfaced at Pepboys and replaced my radiator with a larger 1 inch ...
6
votes
0answers
45 views

Coolant expansion tank issue

My coolant tank is filled up to the correct level before driving off but I've taken a half an hour drive and it is very low and warning light comes on. Once stopped it cools down and the level rises. ...
5
votes
1answer
94 views

AC Cooling stops at high speed

My car ac works very fine in normal conditions. But when I drive it for awhile longer, and often at high speed, it stops cooling. I can still hear the fan sound loud and clear but air flow decreases a ...
4
votes
0answers
114 views

Radiator has a leak and the upper hose is clogged, car does not overheat. White smoke from upper hose

My car is a 2003 Buick Century and it has been leaking for the past few months (puddles of coolant under the car). Now the car begins to have white smoke coming from the engine and it has a sweet ...
4
votes
1answer
22 views

1994 Dodge Dakota V8, Antifreeze leaking from water pump

Every time I put ether antifreeze or water in my radiator it immediately comes out from beneath the water pump? What could cause that to happen?
6
votes
2answers
86 views

Why does my overheating car cool off on declines?

Thanks for your never-ending support! The quick and precise answers and suggestions that you all provide is priceless in its worth. After the timing belt change ( I skipped the water pump, it looked ...
6
votes
1answer
65 views

How to test the function of a water pump?

Is it possible to test a water pump for proper function (ability to move a certain volume of coolant) without disconnecting it from the engine? If so, how would one do that?
5
votes
2answers
62 views

Will an engine overheat if it has no coolant recovery tank?

My wife's Mini has a leak in the coolant recovery tank, and she has been told by the dealer that her car is at risk of overheating without the coolant recovery tank.Frankly, I don't believe it. Cars ...
4
votes
0answers
68 views

Honda Civic 2002 Coolant sprinkles back from Rad cap

I am having issues with this car, so I am reaching out to masses out there who could share some of their wisdom to help me understand the actual issue with this car. It has 262K miles on it. Issue ...
1
vote
0answers
23 views

Low water pressure and oil pressure at the same time [closed]

I have a 98 Camaro and I would like to know what's going on with my car. It is currently experiencing of loss of water pressure and oil pressure at the same time, and then it starts knocking as if its ...
6
votes
2answers
67 views

Coolant in engine… Head gasket going

I have an 05 Equinox, and while idling it sometimes overheats. We have to continously add coolant every week. If this was the only problem, I'd fix it, but, there's other issues as well, and combined ...
1
vote
0answers
58 views

City golf 1.3 overheating badly

I bought a new thermostat and heat gauge switch, however, my car is overheating. Every time I fill it with water, it sucks the water and I have to refill it. When I switch the car off it over heats ...
2
votes
1answer
58 views

No fluid under thermal sensor | '89 Jeep Cherokee reserve cooling system won't drain? | Car dies while running? & Car dies without running?

!importantclosed-cooling-systemcherokee-89laredo6-cylender4-liternon-startstalling I'm wondering if the vacuum went bad, or if it could be anything else? !PULL THE METAL LEVER UNDER THE VACUUM WHILE ...
-1
votes
1answer
48 views

Honda Civic Overheating

My Honda Civic 2003 keep overheating after I change the radiator I change the water pump. I changed the thermostat. Can someone please help? Tell me what's wrong with my car. Thank you guys
6
votes
1answer
144 views

Electric water pump control

Electric fans are now common on cars, both aftermarket and stock. The advantages in horsepower, faster warmup, and hence emissions are well documented elsewhere. The same reasoning can be applied to ...
13
votes
2answers
188 views

How do I troubleshoot the source of oil in my coolant?

I would like to know the step by step troubleshooting procedure for discovering the source of oil appearing in coolant. There are several different points of failure that can be the root cause for ...
5
votes
1answer
78 views

Min/max fill for coolant reserve/overflow tank in abscence of markings

I have a 2001 Honda Prelude SH. I am looking at the coolant reserve tank. There are no min / max fill lines visible, although the manual says there should be. I am just re-adding coolant after fixing ...
4
votes
1answer
45 views

Waterbottle cap still poping off

I have a 2008 Ford Fiesta 1.6i. The car heats up and builds pressure in the water bottle that causes the cap to pop open and boiling water to come out. I have taken it to Rord where they have done ...
3
votes
1answer
70 views

Over heating of my 05 Honda Civic

I first purchased my Civic in Jan of 2015. My first car had terrible over heating problems so I decided to get rid of it for my civic. Turns out, my Civic has the SAME problem. I decided to take it ...
3
votes
2answers
161 views

Effects of anti-freeze concentration on engine temperature

I am curious as to how useful the engine temperature sensor actually is. It tells you the coolants temperature obviously, but I have read that the engine actually operates hotter than the coolant. For ...
2
votes
1answer
55 views

No water flow in the radiator - 99 Cadillac STS

What's wrong when water doesn't flow from your radiator. I already put a water pump and a thermostat on putits still running hot. What could be the problem?
4
votes
2answers
255 views

Coolant boiling and smoke coming out of engine bay

I have a 1995 Toyota Camry SE that has 195,000+ miles that has started to develop some serious problems. Aside from what I believe to be an issue with the transmission, the car had been running ...
4
votes
0answers
59 views

2006 VW Jetta Diesel won't warm up [closed]

A couple of years ago the VW (2006 Jetta) quit warming up. No heat, no defrost, temperature gauge reads cold! I changed thermostat and tested both 'stats at the same time. Both opened right at 195 °...
10
votes
1answer
135 views

Coolant Reservoir

Two questions, One, is there any reason why some coolant bottles are shaped in this way? Two, if this coolant bottle was placed on its side such as in the image below for example would coolant ...
7
votes
1answer
134 views

What exactly is meant by “engine coolant”?

I know that engine coolant is a fluid in the engine used to dissipate heat spots and keep the engine cool in general as the moving parts generate heat. In this context, I would call the oil an "engine ...
1
vote
1answer
35 views

2000 Vw passat 1.8l oil is in radiator

I have a 2000 VW Passat GLS 1.8l and it has oil in the radiator reservoir. and my Oil light says oil compression low. i flushed the radiator and found oil in it again, (the radiator overflow) it ...
1
vote
1answer
22 views

1978 Ford 302 is using a lot of water

My 1978 Ford 302 is using a lot of water. There is no oil in the water or no water in the oil and I cant find any leaks. What can I do?
6
votes
1answer
590 views

How can I test my thermostat?

How can I tell whether a mechanical thermostat works as it should? Is there a test that can definitively tell me if a thermostat is good or bad?
4
votes
2answers
95 views

Replace Yamaha FZ6 radiator for two smaller ones

I bought the engine of a Yamaha FZ6. I want to use it to run a competition single seater car we are builiding in the university. The engine didn't bring the radiator with it. I would like to ...
9
votes
3answers
2k views

Car won't reach operating temperature

Here's a seemingly simple problem - I noticed that the temperature gauge of my mother's 2004 Opel Meriva 1.7CDTI won't ever climb above minimum. I checked the OBD readings to see if it was a defective ...
5
votes
2answers
121 views

Water underneath floor carpet - Mazda Protégé 2002

I just bought a Mazda Protégé 2002 and a few weeks later I noticed a damp spot on the back passenger side floor. Very wet and soaked. Later I noticed the smell grew larger and the vapor on the glass ...
5
votes
2answers
110 views

Why is antifreeze mixture not as stated?

To keep things short I poured 200ml of concentrated genuine ford super plus premium antifreeze (Ethylene glycol based) within a bowl. Then added 200ml of water to dilute the solution to a 50/50 ...
2
votes
2answers
141 views

Coolant disappears from coolant reservoir but no leak observed

I just replaced the water pump in my 2005 Ford Escape V6. I discovered that each time I fill the coolant reservoir with coolant and drive the car, by my next stop the coolant reservoir will be ...
3
votes
0answers
168 views

E46 rough idle with coolant light on

The car is 2001 BMW 330i. I have changed ignition coil, spark and IAC. Last week, my car experienced rough idle. Then I changed the coolant temp sensor today. After adding coolant and bleeding, the ...
9
votes
3answers
6k views

Blocked water flow in engine?

My dad has a 1993 Subaru Legacy L 2.2L (no turbo) with a perplexing cooling problem. It overheats, and there doesn't appear to be flow through the cooling system. The upper radiator hose is extremely ...
2
votes
1answer
47 views

Engine oil going into the coolant

My 2005 Saturn Relay got a hole in a water hose and suddenly overheated, so I shut it down immediately. Found the crank case empty and the coolant full of oil. Replaced the hose and put oil in it, ...
0
votes
1answer
100 views

Does using heat in the car SAVE gas?

Its well known that using heat in a car is almost free (see for example here). It is also known that using the heat can reduce the engine temperature which otherwise needs to rely on water cooling. ...