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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95k 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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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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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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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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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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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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281 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
4k 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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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
444 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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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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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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289 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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'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
153 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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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 (...
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1answer
106 views

99 Chevy Venture leaking water

When I put water in the radiator it flows out as quick as I pour it in. The reservoir is also empty. What is possibly the problem?
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Renault Kangoo overheating - Waterpump? Thermostat?

OK guys, I got a call from my mother. The dashboard of her Renault Kangoo '07, 1149cm³, 55kW shows Aladin's wonderlamp [sic!], the temperature bar is at 100%, and a word, "STOP" appears. I've had a ...
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1answer
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Mazda 2 engine fan starts after turning engine off

Apologies for some unclear terms, I have no idea how some of the components are correctly called in english. I have a 2003 Mazda 2 DY gasoline with about 77k KM driven. Since a couple of months, the ...
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967 views

Thermostat behavior and failure modes

If Zaid's excellent How can I test my thermostat? is "Thermostats 101" then this might be the beginning of "Thermostats 201"… My VW Jetta TDI (diesel) has been running cold (about one or two marks on ...
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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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Should I use the heater while warming up my car?

I know that you should drive off immediately to warm up your car as your entire car will warm up faster this way. However, the common practice to defrost the inside of your windshield is to blast the ...
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What problems can extended use of water as a coolant during the summer months caused by an internal leak [duplicate]

I drive a 1993 Chevy Corsica which has had an internal water leak for 3 years. I am told by mechanics that the water is going into the engine block or that the heater core needs repair. Because I ...
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Why does my 2006 Chevy Equinox have no heat when all repairs for the heat has been made?

I have: replaced the thermostat about 10 times, back flushed heater core and flushed cooling system out about 10 times, replaced water pump, intake gasket, blend door, mode door, actuators, HVAC ...
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459 views

2002 Subaru Legacy coolant overflowed, relatively new head gasket

Yesterday I was finishing a drive of about 80 miles when my heater quit blowing warm air (it's currently winter here). I noticed the temp gauge was at the red mark, so I pulled off the highway and ...
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2answers
2k views

How long can I drive my truck with the wrong coolant in it?

I put the wrong coolant in my '99 Ford Expedition and I was wondering how long I could drive it before I need to have it flushed and have the correct coolant put in?
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No heat in my 2008 Pontiac Vibe

I changed my thermostat twice in a week on my 2008 Pontiac vibe. My car was blowing cold air and running hot but the thermostat would open up and it would go back down to normal. I would have heat for ...
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Found a cut hose

My 1992 Lexus ES300 has been leaking fluids really bad lately, which it never did. I believed some foul play was involved due to certain individual whom I live with. Anyhow yesterday I was just ...
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769 views

No heat in car blowers

I have a Nissan Qashqai 1.5 dci. My car is not overheating and blowers are blowing cool. The lower radiator hose and the bottom of the radiator are cold. I changed the thermostat and drained the ...
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1answer
634 views

Evans Waterless Coolant

I've seen advertisements for Evans Waterless Coolant and have seen Jay Leno tout it on his YouTube channel. My question deals with the operation of the cooling system after you have properly ...
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1answer
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te: 95 Integra Engine Coolant leak

New radiator was installed yesterday, because of severe leak. Radiator was topped off with coolant. White milky film observed in old radiator: mechanic indicates that this oil that has infiltrated ...
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1answer
420 views

1999 Subaru Legacy 2.5 Overheating

I recently bought this car from a neighbor, who warned me that it overheated, but I had bled the system and the car ran fine. Thinking the problem was dealt with I redid two bearings and all the ...
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2answers
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How long to wait for radiator to cool down before working on it?

I need to drive my Integra to a friend's place to work on replacing the radiator. It's been 70 degrees lately, is waiting 1 hour long enough to allow the system to cool down? Any rules of thumb for ...
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1992 Honda Accord overheating issues

Before I dive into a water pump replacement - how would I test it? I have replaced the thermostat, hoses and radiator - all of which needed it. Now the car will go to red (hot) intermittently, and ...
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2answers
62 views

No coolant in Radiator

I had my water pump changed about a month ago. This morning, I started my Jeep to let it warm up and when I went to leave it was blowing cold air. I turned off the heat and turned it to cold and then ...
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What type of coolant should I use on a Dacia Logan Laureate diesel (2016)?

What type of coolant can I use on a 2016 Dacia Logan Laureate diesel? It is a little low so want to top up and see if it lessens again. Its not in the owners manual.
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1answer
196 views

Overheating issue - 2000 Grand Am GT

My 2000 Grand Am GT overheats. When I turn on the A/C, it goes right back to normal temp. It also leaks coolant. Coolant leaks out for up to an hour after parking it. It is leaking towards the front ...
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Should you change a thermostat when changing your water pump

Just got my water pump changed. Now my thermostat is trying to edge up. Should you change your thermostat when you change your water pump?
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1answer
802 views

Loss of water in the radiator

The air conditioning in my vehicle began running hot at intervals, then I noticed that the temperature gauge began bouncing between the hot and middle mark. I was advised to change the thermostat and ...
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1answer
2k views

How to diagnose low water temp on Mini Cooper

My coolant temp looks like this: It fluctuates, but never really goes much higher than the first bar. It's not really been a big issue for me, better cold than hot, however the cabin heater has ...
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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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2014 Hyundai Elantra - Spilling water sound

In my 2014 Hyundai Elantra, I can hear what sounds like water spilling out by the drivers side dash. I pulled in the driveway, sat for a moment, and heard it. I had the defroster on the first time ...
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2answers
551 views

Ford F150 1999 4.6L anti freeze leaks from drain on engine wall

They say heater core, Ford dealer replaced it 3 years ago. Its leaking from the drain. I have luke warm air from vents. I was told to turn the temp knob from cold to hot a few times, I did and it ...
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1answer
716 views

Changing Coolant in a 1999 Ford Taurus

After I flushed the radiator and filled it with fresh coolant (50% mix) up to the optimum level in the reservoir "low coolant" light comes on when I drive the car. The engine does not over heat, ...
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1answer
35 views

2001 Saab radiator end tank has split open (6" SPLIT)

I had an end tank split open on a trip last fall. I had moderate temperatures going up long hills and replaced it. 10 months later, the new radiator did almost the same thing in cooler weather during ...
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1answer
73 views

3.4 2000 chevy venture ls is pushin water up in the radatior

in my 2000 chevy venture 3.4 LS my water in my radiator pushes up instead of goes down and builds pressure on the over flow. What causes that? Would a head gasket or intake cause that?
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2answers
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Temperature gauge needle is on Hot, but engine is not overheating

car is a 1996 Honda Civic EK hatchback. B16A2 DOHC VTEC engine. Currently has 204,000 kilometres (127,000 miles) When the car is on a stop and idling, the temp gauge needle goes up steadily, and when ...
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My head gasket was fixed but I still have a leakage

I have a leakage, the cooling fluid reservoir is empty and some has leaked from the radiator. I already fixed my head gasket that was leaking. Now the mechanic is telling me I need a new water pump, ...
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2004 Saturn Ion Quick Connect from OEM

I've purchased a new radiator for 2004 Saturn ION and it came with quick connect fittings. My oil cooler lines require thread connect. Is there a way to switch them to quick connect, or is there a ...
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1answer
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Holden Captiva - Lots of oil pouring out the radiator expansion tank

On my 2012 Holden Captiva 2.2 diesel car the radiator expansion tank has filled with engine oil and now the oil is pouring out of the expansion tank. I am at a loss to why/how this has happened. Any ...