Questions tagged [cooling-system]

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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1answer
776 views

Should I open the radiator cap in extreme cold

I have a 1.6L petrol Peugeot 307 (2001) that normally is driven in the south of Sweden where temperatures are typically greater than -10 degrees Celsius, but am now in the north where temperatures can ...
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5answers
6k views

Oil vs Coolant Temperature

Could an engine be run dry, as is the case with solid blocks, meaning no coolant, if a sufficient oil cooler were to be installed? Essentially, if we could keep the oil temperature between 210 and ...
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I have a broken impeller on a water pump 2002 Mitsubishi Galant

When I took out the water pump I seen that the impeller was broken and it was no peaces that fell out what should I do
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448 views

Crud in Coolant Expansion Tank

I have all this brown/orangish mineral crud in my coolant expansion tank. I've flaked some of the more substantial deposits off as you can see in the last image below. Is it something I should be ...
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1answer
290 views

Trouble with overheating - coolant boiling while trying to burp system

I've got a 95 Acura legend with cooling issues. I recently replaced a cracked radiator and the thermostat while i was at it, but the coolant is boiling before the thermostat opens so I can't burp the ...
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1answer
967 views

Water from coolant system leaking under engine block

Water pissing out under engine block instantly after water poured into the cooling system. Has something came loose or is cause for real concern and a high-cost repair? In which car will sadly have ...
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209 views

My bike Dominar 400

Why is my coolant level low again and again. I drive for only 30 kms; after that the coolant is below minimum level. I top it up to the maximum level.
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1answer
1k views

Cooling System Cold Radiator

My 2004 Buick Lesabre has a cold radiator and the reserve tank is cold also. The top and bottom hose are warm. There is good heat inside. and the temperature gauge reads normal. I don't see any leaks ...
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3answers
4k views

If coolant evaporates, does the anti-freeze portion evaporate as well?

If it does evaporate, then how much in comparison to the water? If it does not evaporate, can I be safe to assume I only need to add water when replenishing lost coolant? Edit #1 I just want to ...
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2answers
50k views

Will a radiator suck fluid out of the overflow tank if I didn't fill the radiator completely?

I recently changed the engine coolant in my 2006 Prius. The system is the type which has the radiator cap on the radiator and a separate overflow tank. The whole system yielded about 1.5 gallons of ...
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3answers
1k views

How is oil in an engine cooled?

After reading some articles regarding 'running low on oil', I understood the logic that having more (appropriate amount) of oil is better than running low as oil has time to cool down before it has to ...
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3answers
3k views

Subaru Forester running warm

My Forester (2004 2L XT) has always run in the middle of the temperature gauge - until a couple of weeks ago, since when it has started running warm at slower speeds. Now, it gets right up above 3/4 ...
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1answer
582 views

Why do some air cooled engines use a fan with unevenly spaced blades?

The image below is of a "Predator 670" engine with the fan shroud removed. These engines are available in the United States at Harbor Freight. It is a simple air cooled twin cylinder design, commonly ...
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1k views

a little squealing, overheat, coolant overflow, then back to normal

2004 Subaru Impreza Outback Sport, 200K I went for a 50 mile highway drive at 60 - 70 mph. When I arrived, all the coolant that had been leaking from my car started to burn on the exhaust (visual ...
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2answers
2k views

Engine overheating sometimes

Vehicle 2002 Mazda Protégé LX 2.0, 238,000 km Symptoms Friend called, his girlfriend's car had been overheating. Mechanic told them the radiator was the problem, as it was out of coolant. Repairs so ...
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Why is coolant in the reservoir boiling?

This is a 2011 Chevy Cruze 1.4 L Eco with 116xxx miles on it. The other night I made it home from driving about 30 minutes from work and when I turned the car off I heard some noises. I looked under ...
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35 views

Cooling fans only work normally with cabin fans on

2003 civic EX 1.7L automatic Hello, I am trying to help my friend with a really weird cooling fan issue. The cooling fans were not coming on and while sitting in traffic the car would overheat. ...
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1answer
2k views

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

I looked at a Ford F-150 truck for sale today with the 5.4L V8 Modular motor. The truck had no running issues. After raising the hood, I noticed something odd. There is solid material stuck to the ...
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1answer
504 views

Why my Fiat Palio 1.6 2005 is overheating only after 5 min of drive?

I have a Fiat Palio 2005 which I bought few days ago. I was driving it for last complete week and it was very smooth there was no problem at all. Yesterday , suddenly on a highway the temprature ...
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194 views

Oil and sulge in water colling system VW golf MK4 1.6 [duplicate]

Hie guys I had oil and sulge in my water cooling system. took out all the coolant and replaced it with clean coolant. took a test drive had the same oil in my system again. what could be the problem?
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1answer
3k views

How do you clean out blue devil (sodium silicate/liquid glass) out of your cooling system?

I poured blue devil engine sealant into my engine as a quick fix for my head gasket problem. It's made the issues worse now there is what looks to be white rock salt in my radiator and heater core and ...
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1answer
2k views

Honda civic 03 overheating, checking the cylinder head and block for cracks?

I have 150k on my 03 Civic it has overheated several times. I can drive the car around town without it overheating, but when I drive it on the highway for an hour and it will overheat. I thought I had ...
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1answer
1k views

What portion of the cooling system is rust formed in?

TLDR: What portion of the cooling system is rust formed in (I.E. Engine block, radiator, all... etc) I did a coolant flush in a 94 Ford Ranger 2.4L at 226K. It was a consistent brown color and the ...
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20k views

Car temperature drops to a little less than 1/4 at highway speeds. Any reason to be concerned?

Car is a Mk1 Golf. Driving around town the temperature behaves normally - it sits at the middle of the gauge, sometimes goes a little higher if I'm sitting in traffic but not much. However, on the ...
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2answers
3k views

Why does the radiator fan start after riding 15 minutes?

I bought Honda CB 400 SF, version S, used motorcycle. When I ride for about 15 minutes, the radiator fan starts running. While I am driving my legs felt warm air from engine. I am wondering if the ...
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1answer
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Why does the inlet pipe into the thermostat housing keep blowing on my 2005 Honda Civic with 1.7L engine?

I have replaced the O ring. I have replaced the thermostat and cleaned everything. I have checked for anything that might be stopped up or blocked. I have replaced the head gasket, replaced the valve ...
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335 views

Excessive Coolant Expansion: Part 3

Part 3 in the ongoing saga of my 98 Mazda 626 2L ATX's cooling system. Here are links to Part 1 and Part 2. A quick recap. My coolant tends to overflow my expansion reservoir. I've flushed the ...
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627 views

Help! Too much pressure in cooling system

So I have a 1980 Buick regal with a Pontiac 265 v8 mated to a th200.. I am having issues with the cooling system. I have replaced a dozen thermostats and 3 radiators. and 3 aftermarket coolant temp ...
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2answers
578 views

Lot of oil in radiator

I want to know what the problem can be. I have a 2000 Land Cruser 5 cylinder. I had a small oil leak and that was fixed. Saturday it needed oil and I filled it up. Saturday afternoon when I parked ...
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1answer
2k views

Temperature gauge is at 3/4 mark

I have a 2001 Nissan Sentra and recently had an oil change last month and a coolant flush just last year. A few days ago, I noticed the needle of the temperature gauge went up to the 3/4 mark while I ...
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1answer
147 views

Coolant loss through overflow tank for 1997 Volvo V90 wagon

All cooling system hoses / connections and head gasket are fine and I recently installed a new coolant overflow tank / cap and I have 100% water (don't want to waste money on antifreeze yet). PROBLEM ...
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1answer
527 views

Super weird Yaris 2003 A/C problem

I have a 2003 manual Toyota Yaris with a very strange A/C problem, which got me and the A/C shop baffled. History: Since I bought the car 8 years ago, it had a weird problem where the A/C compressor ...
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7answers
53k views

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

I was reading online and found a few people saying you should never add concentrated anti-freeze to a cooling system. you should only dilute what you already have in there with water and only add anti-...
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1answer
98 views

Draining cooling system & Distilled Water

I saw a video on Youtube where someone changed the cooling liquid of their car's cooling system by first draining the system and, then, by putting distilled water in it. Once the distilled water is in ...
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1answer
142 views

Number of times you should refill and drain your cooling system to get pure water?

I understand before refilling your system after a coolant flush you should refill and drain the system several times with water. This is fine however last time I refilled and drained over three ...
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1answer
4k views

Should I do combustion gas test in radiator or reservoir neck?

I bought this cooling system combustion leak tester. I have a few questions regarding its usage: While the instructions say take off the radiator cap and insert tester, it appears that at least some ...
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1answer
109 views

2000 Pontiac Grand Prix Idles at a higher temp than normal

I've just changed my oil and originally put diesel oil into my 2000 Pontiac Grand Prix accidentally, but removed it before ever turning it on and put the correct oil in. Now 1000 miles later, it sits ...
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1answer
209 views

Reservoir tank is overflowing on my 2000 Pontiac Grand Am

I took the car down to have the radiator flushed but the mechanics refused to do it because they say I have a couple of leaks in the head gasket and intake valve gasket. First off, what is the ...
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0answers
67 views

Radiator Fan On to Off Ratios by Temperature and Humidity

In an answer to another question, @FredWilson made the following comment: At idle expect to see the fans off much longer than they are on in a normal system. The ratio of off to on depends on ...
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1answer
171 views

Drain coolant as much as possible through radiator drain valve?

I want to perform a complete coolant flush on my 08 Crown Victoria. I have some 50/50 coolant and I guess the remaining distilled water will over-dilute the antifreeze. Is there a way to drain most ...
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1answer
760 views

2004 Honda Civic with Puzzling Cooling System Issues

My 2004 Honda Civic has been having some puzzling cooling system issues. The car would slowly start to overheat, giving me enough time to pull over and shut the car off with one exception. When the ...
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3answers
119 views

Cooling System and Overheating

I have a 99 Nissian Altima! Fans work,Thermostat opens and closes,but my job is about 22 miles from my house and i take the highway; on the highway my cars temp stays on normal with no flunctuation.(...
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0answers
105 views

Can a bad coolant temperature sensor or a bad wheel bearing hub cause my check transmission light to come on?

I have an 05 Ford Explorer Eddie Bauer. The check transmission light will come on and the o/d light will flash after driving it for a while. I know my rear hub needs to be replaced, but recently was ...
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3answers
319 views

Engine overheating for short period of time

I recently replaced radiator fan, thermostat and CTS (green one) and my engine is still overheating. The primary suspect is the water pump, but I could use a confirmation so I don't replace a good ...
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1answer
3k views

Cracks in coolant expansion bottle

Two years ago I had bad cracks in my coolant expansion bottle, so bad that coolant would leak though. I replaced the expansion bottle and after only two years there are already cracks showing. Not as ...
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1answer
78 views

Is there such thing as flushing coolant to often?

If I were to go with a coolant flush every 15 to 20 thousand miles is this considered a little too excessive? It’s a ford fiesta mk 6 the service interval by the manufacturer is recommended at 100 ...
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2answers
1k views

What is the reason for hardwiring ground wires for cooling fan and a/c compressor?

I have a 2007 Mazda RX8 and am getting it ready for the hot summer weather. Put a new a/c compressor in only to find that it stays running whether or not the switch is on inside the car. This lead to ...
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1answer
1k views

How to determine component causing overheating?

Car: 2008 Audi S5 4.2L Background: Fan has been working very hard for the last 3-4 months (albeit it was summer, but even on cooler nights it was on max), temperature on dash dial steady in the ...
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2answers
260 views

Engine temperature reading higher than usual

I have a 2011 Toyota Axio. Usually, the engine temperature gauge was always below the medium range. But recently I have noticed that it goes to the mid-level that is slightly higher than previously. ...
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2answers
315 views

my engine over heated

I have a 2001 Jetta GLS automatic SOHC, and the engine overheated pretty bad. Inside the head, the cam cover was plastic and melted and went through all the coolant hoses. I am replacing the whole ...

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