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
956 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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15k 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
873 views

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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1answer
315 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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488 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
521 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
137 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
487 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
44k 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
92 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
137 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
103 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
203 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
63 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
147 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
669 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
107 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
97 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
276 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
228 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
266 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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0answers
58 views

1998 Grand Cherokee 318 V8 losing coolant

I am constantly having to add coolant to my 1998 Grand Cherokee (318 V8); about 1L every couple of months or few thousand km. Exhaust is clear, consistently passes emissions tests, no puddles where ...
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1answer
475 views

Oil in the cooling system due to failed oil cooler

My 2014 Ram Eco Diesel's oil cooler failed and injected 1 to 2 quarts of oil into my cooling system. The dealer flushed the cooling system several times and replaced all hoses, oil cooler, radiator ...
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0answers
2k views

Blue Devil affect on water pumps

I used Blue Devil Head Gasket Sealer on my 2006 Ford Explorer about 6 months ago, and it's worked. However, I am now noticing some antifreeze dripping on my garage floor, which seems to be coming from ...
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1answer
120 views

Does it matter if you only flush half your coolant?

For example if I were to drain my coolant once, then Re-fill, would this be okay providing the coolant is the same brand and type? I have made a habit of doing this in the past as due to my ...
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1answer
2k views

What deteriorates engine coolant, Milage, age or both?

Basically what is said in the title, what is a bigger factor on the life of engine coolant? Is it mileage or age? Say someone were to cover around 30,000 miles a year however only changed his/her ...
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1answer
487 views

what in the thermostat opens when it reaches a certain temperature?

what actually opens when it reaches the certain temperature, is it the spring or is it the copper, or does the heat of the engine make the spring softer allowing it to come up and let coolant start ...
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3answers
88k views

What problems can a loose radiator cap cause?

The radiator caps in all cars seem to be very tightly installed. In some cars (at least in my 2011 Toyota Yaris), the radiator cap is not round so you can remember the position it was at, but in other ...
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0answers
85 views

Why do so many diesel engines have problems with aluminum oxide in the cooling systems?

I have a bad case of aluminum oxide contamination in my 98 Mazda 626's cooling system. While researching the subject, and filtration solutions, I noticed that this type of problem is very common ...
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2answers
3k views

Engine Overheat via Head Gasket Leak

I've recently learned that a bad head gasket can be a cause for a car to overheat. Could someone explain how this is possible and what's going on mechanistically? It sounds like this symptom is not ...
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2answers
3k views

Truck overheating; no coolant flow through radiator

I have a 95 GMC Sierra 5.7 it suddenly overheated one day and the upper radiator hose busted. So far I've changed upper and lower hoses thermostat and water pump and flushed radiator. All new parts ...
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0answers
53 views

Engine Runs Cold Nevers warms up above 1/4 way. 1995 Chevrolet G20 4.3L V6

1995 Chevrolet G20 3/4 ton Van 4.3L V6. The van never runs any warmer than 1/4 on the instrument panel. I have replaced the thermostat twice. Same issues. I have replaced the temperature control ...
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3answers
30k views

Overheating at idle - mechanic says head gasket

My car has been overheating at idle after a long period of time - perhaps 20-30 minutes in traffic. If I drive, it immediately starts to cool down again. I don't drive often so it hasn't been an issue ...
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3answers
248 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. ...
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1answer
3k views

Testing / checking a water pump

Is there a way to reasonably diagnose a water pump failure directly? In How to test the function of a water pump? the question is posed but the accepted answer only provides a way to infer that the ...
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2answers
6k views

Dodge Ram - no heat at idle but have heat when driving

I have a Dodge Ram 1500, I have changed the heater core, radiator, the water pump, and the thermostat. When I push on the gas it blows out hot air but when its at idle it blows out cold air.
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1answer
368 views

2011 Equinox Heat only on high RPM

My 2011 Equinox 71000 miles on it...- The heater blows hot air only when the RPM is high - as in highway or accelerating. It blows cool air at stop lights or idling. It's winter here lol - Any ideas? ...
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2answers
1k views

what happens if I drive without coolant? [duplicate]

My car is a Honda fit 2009 and the coolant is low, should I just buy coolant? or is it something more serious?
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0answers
48 views

97 Suburban overheating

Lower radiator hose is hot upper radiator hose is cold and thermostat has been removed but it still overheats, water boils out when the radiator cap is removed. It overheats while not moving, as well ...
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1answer
280 views

Engine Overheating - Strange Behavior

A while ago I bought an Audi A3 2001 8L1 and the temperature never reached 90°C, well it did (for a few minutes) but only when there was a lot of strain on the engine like going uphill but never on ...
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1answer
4k views

'05 Accord - No heat; changed thermostat

Alright so here's my problem. My 2005 Accord does not have HOT heat coming from the blowers. Sometimes it blows warmish. I just changed my thermostat today, and when I drained my radiator, the ...
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2answers
148 views

Things to Consider While Installing a Radiator

I have been using a KTM Duke 390 engine in my formula car. The engine is overheating, so I thought of using a twin parallel type radiator setup. What are the points to be considered before I set the ...
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2answers
930 views

Does my mother's car have a thermostat problem?

Today, I was driving my mum's car, a Citroen C3 1.4 HDi from 2004, and I noticed that the coolant temperature was rising very slowly. Just as a reference, this is what the dashboard looked like (...