Questions tagged [coolant]

An alcohol based fluid that is miscible in water and used to remove heat from the engine. Also see the [cooling-system] tag for related components such as the radiator and water-pump.

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5answers
19k views

Intermittent “low coolant” light. What to do next?

In the last few days the "low coolant" light has been intermittently turning on on my friend's BMW X3 (2007 ~70K miles). The light is not constantly on yet. I checked the coolant reservoir and float ...
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2answers
643 views

How do car cooling systems cool the engine? Won't the air flowing through the radiator flow over the engine (as it exits the car) making it hot again?

Cool air enters the radiator and becomes hot. Won't the hot air now flow over the engine and make the engine hotter too?
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2answers
84 views

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 ...
6
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1answer
95k views

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 ...
6
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1answer
1k views

Highlander Hybrid losing oil/coolant

I've received a variety of opinions regarding what may actually be wrong with my car. Here is the story so far... Sep. 2016: ~96k miles: Bought 2008 Toyota Highlander Hybrid from dealership. One ...
6
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1answer
2k views

Why do modern vehicles omit a temperature gauge?

I'm more specifically interested in performance vehicles. My current car has gauges for coolant temperature, oil temperature and oil pressure. The coolant temperature gauge is there so you can tell ...
6
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1answer
36k views

Should overflow tank be filled when replacing coolant?

I have recently fully rebuilt my engine, minus the block and pistons. All the gaskets were replaced, valves lapped, valve lashes tuned etc. I did it because I had an overheating problem and a head ...
6
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2answers
970 views

25Nm vs 28Nm - How accurate should a torque wrench be?

I am soon doing a coolant change on my car, including draining the coolant from the block using the drain plug, and I have heard of a few people apparently snapping these off due to over torquing them,...
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1answer
1k views

How to flush coolant with only access to expansion tank?

OPEL CORSA B Sedan 1.6 IE 1999. I would like to flush the coolant and bleed my brakes. For the coolant, I have bought German HEPU antifreeze, Anyways, I only have a reservoir bottle and I do not ...
6
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1answer
10k views

04 Tahoe “Engine Coolant Hot” message

I am out of town with my Tahoe and getting the message "Engine Coolant Hot" on my dash message system. When it pops up I notice that the temp gauge goes up almost to the red line. Also the air ...
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2answers
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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 ...
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4answers
1k views

How to prevent nut falling off ring wrench?

I have minimal space to work with on a BMW X3. I am changing the coolant. I am following these instructions: https://www.newtis.info/tisv2/a/en/e83-x3-2.0d-sav/repair-manuals/17-cooling/17-00-...
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2answers
27k views

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

I have a Triton v10 engine in my vehicle I have oil in my coolant but no coolant in the oil. What could be the problem?
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2answers
3k 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 ...
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2answers
76k views

Mixing antifreeze?

My dealer has not been good about topping off fluids lately. I bought some antifreeze (http://amzn.com/B0089LSFJ0) to get the level to just above minimum, but I'm concerned that I don't know what the ...
5
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2answers
353 views

Ditch water in radiator

I lost a coolant hose going down the road and all my antifreeze was gone. I found a puddle along the road and filled my radiator back up after I fixed the hose. Will this cause electrolysis in my ...
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2answers
2k 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 ...
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2answers
5k views

How, and why, do you test coolant concentration?

In the owner's manual for my 2001 Ford F-150 (5.4L), in the section on "Adding engine coolant", it specifies the type of coolant to be used, and says it should be mixed 50/50 with distilled water. It ...
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5answers
181k views

Coolant level is below “low” in the expansion tank, dealership service says this is normal?

I took my car to the dealership for an oil change and inspection, which includes the fluids being checked and topped off. After the service, I took a look at the fluids in the car. There is a tank ...
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2answers
14k views

Mixing Coolants

I have a Volkswagen Jetta 2008 S, and I recently noticed that the coolant level is near minimum. My user guide told me to get the purple G12 coolant and that was what the auto parts store made me buy. ...
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1answer
13k views

Bubbling sound from coolant and increase coolant liquid level

I drive an old Daihatsu Charade 1993. Just 2 days ago, I heard a bubbling sound from the coolant when I turned off the machine. I didn't really care much until yesterday when the car got hot ...
5
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1answer
442 views

I have engine oil in my coolant. What might be the reason?

I have purchased a pre-owned car. After the purchase I saw there was engine oil in the coolant reservoir and also the coolant level is going down slightly. Engine is not heating up. What do I do? ...
5
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1answer
758 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 ...
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3answers
4k views

Car engine is overheating while Coolant Temp Sensor is normal

I bought a BMW 318i and the engine overheated twice so far while the coolant temperature sensor is normal. If we exclude the possibility that the sensor is malfunctioning, what problem would cause ...
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4answers
114k views

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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3answers
5k views

Does a small amount of dried coolant warrant replacing block heater, radiator and hose Or can I use K-Seal?

My garage found a small amount of dried coolant on my radiator and block heater and tell me that I needed to replace my radiator, block heater, and hose urgently, as it could leak at any moment. I ...
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1answer
10k views

Blew the radiator cap and now can't start the car, what could it be?

lent my Toyota starlet to a friend today and they broke down. On investigation it appears the bit the radiator lid attached to has blown off. There was very little coolant in it and remnants were all ...
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1answer
667 views

2003 Toyota Rav4 ECT Too Low for Readiness Monitor Drive Pattern

I recently failed an emissions test because my CAT and EVAP readiness monitors were "Not Ready" following a reset check engine light a few weeks back, which told me that the engine coolant wasn't ...
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2answers
9k views

Changed radiator, now have misfiring?

I have a 1996 Nissan Altima. I had to change my radiator recently because it developed some cracks on the top of the tank and I would have to refill the tank every few days. When I changed the ...
5
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1answer
5k views

Coolant draining in Subarus

In Subarus the thermostat is located at the lower radiator hose, in one body together with the pump, effectively separating water inlet from the radiator to the engine block and core heater. Yet to ...
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1answer
4k views

Mysterious coolant leak HOLDEN ASTRA

Recently I have started to notice that there's coolant (presumably) leaking from the engine. There's no obvious leak when you look at the engine from below right after you have driven it, but it ...
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2answers
5k views

Coolant below minimum every 6 weeks - Mk4 VW Polo

This is about my VW Polo (mk4). It's been a cat C in the past after taking a knock to the front bumper. It needs the coolant topping up every six weeks (ish). I've been carrying a bottle of water in ...
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1answer
2k views

2005 Subaru Forester XS overheating

While on a roadtrip, the car started overheating with coolant boiling out. We refilled the radiator with coolant, but it kept occurring. We managed to make it back home by having the heater on high ...
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0answers
298 views

Chevy Malibu 2009 coolant sensor

I have a problem with my malibu, I got a code on the obdii reader as though the coolant temperature reading is not correct, so in the car lcd on the instrument cluster I can see Coolant temperature : -...
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0answers
61 views

Saying its running hot but full of coolant and not over heating [closed]

2005 Hyundai Elantra. Says its running hot but has coolant and so far hasn't over heated and also can't turn on heat in car because smoke pours from vents into the inside of car.
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4answers
121 views

Will my 2002 Mustang make it from California to Iowa?

I have a great 2002 Mustang automatic 6cyl in great condition, but I am a worrier and want some outside opinions. I am the second owner of the vehicle. Have owned it for 1year, 7 months and I get my ...
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4answers
8k views

How can I fix my cracked radiator temporary for a trip? Is there any way to do it?

My car is a Chevrolet Lumina 2001. About 2 months ago I changed the radiator of my car because it was leaking, the guy that changed the radiator got the radiator in a junk yard place for cheap price. ...
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3answers
8k views

Ideal Coolant Temprature for BMW F20 116i

I've a 2012 BMW 116i F20 (turbocharged). Bought it at 2012. After two years of using it as default I got it coded with Gorilla so that it's default hp of 136 bumped up to 210. Now it's close to 29K in ...
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2answers
3k views

What could cause burning engine oil and a decreasing coolant level

I have 2010 VW Polo 1.2 diesel with 85,000 km on it. One year ago, the display started with the check engine light on and flashing: Pre glow light. Speeds are decreased after 90. After driving 1,500 ...
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2answers
68k views

My car won't start. Is it that I ran it without coolant or is it my battery?

Sunday I didn't use my car. At 9pm I moved it across the street because the street sweeper was passing on Monday. Monday morning at 8:30am my car doesn't start. I remembered that I haven't checked ...
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2answers
32k views

Can different coolant types be safely mixed?

Technician A says that there are a number of coolant types that each has its own life span. Technician B says that mixing of coolants is generally ok, since all coolants use the same chemical base. ...
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3answers
2k views

1996 Rav4 not warming up properly when driving and heat not hot

I have a weird problem. I recently changed the radiator and flushed the whole coolant system during replacing the radiator. I also flushed the heating core by itself. The thermostat was recently ...
4
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3answers
793 views

How do I fix this coolant flush?

My vehicle is a 1999 Saturn SC2 with a coolant capacity of 7 liters. I attempted to start flushing my coolant before changing the water pump. I drained the coolant from the bottom of the radiation. ...
4
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1answer
18k views

What is the safe limit for engine coolant temperature?

I just bought a new car and out of curiosity, during one of my trips, logged the data using OBD scanner. I noted the max engine coolant temperature was around 100 deg C. What is the redline here? ...
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1answer
1k views

Safe to store bike with no coolant?

I'm storing my track bike, a first gen SV650, over the winter. The coolant is distilled water and Water Wetter. The storage is heated, but I'd just as soon not worry about their losing power or ...
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2answers
33k views

What could cause the engine temperature gauge and AC to fail simultaneously?

On Wednesday I noticed my car's temp gauge reading at bottom while driving down the highway. The air conditioner was also non-functional. Each of these components were working fine the day before. The ...
4
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3answers
2k views

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. ...
4
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1answer
1k views

Flushing coolant after driving only with water in

If I drive my truck for 30 min with just water in my system, would it be equivalent to just flushing it stationary (the proper way to flush it)? IOW, if I just drive around with a clean water refill ...
4
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1answer
47k views

Engine hot, radiator cold

I own an Audi A3 2001 8L1. When engine gets to operating temperature it sometimes starts to overheat. I touched the radiator after driving the car for some time and it was completely cold to the touch ...
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6answers
42k views

Coolant spills out of the overflow tank at high pressure

My '98 Subaru Forester spills all its coolant with very high pressure and overheats. I changed the radiator cap and did a flush, but still have the same problem. I added stop leak, but that did ...

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