Question about Renault 181

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Loosing engine coolant , with no external leaks

Loosing engine coolant , with no external leaks

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  • peter_lingar May 10, 2010

    no leaks in side the car

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  • Master
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Look for leaks on your floor inside the car could be a heater core leak.

Posted on May 09, 2010

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1 Answer

Why is my car loosing antifreeze


There can be numerous reasons for coolant loss.

External Coolant loss
1. Coolant escaping from the radiator cap. Replace the cap.

2. There is an external leak in the system which could be from a hole or crack in the radiator(especially the plastic sections) or a hole in a radiator hose or there is a loose hose connection.

3. The water pump gasket has deteriorated and coolant is escaping from around the water pump fitting.

4. There is a crack in the coolant overflow reservoir and coolant is leaking out.

Internal Coolant Loss
1. Coolant is escaping into the engine's cylinders in which event you will see white smoke coming out of the exhaust and you will also have combustion gasses leaking into the coolant passages which will cause bubbles and overheating of the coolant. This problem will be due to a failed cylinder head gasket, a crack in the cylinder head or both.

2. Coolant is escaping into the engine lubrication system and in that event you will see evidence of coolant in the engine oil. Pull the oil dipstick and check the condition of the oil. If it looks a bit like chocolate milk and not just normal oil colouring you have coolant in there. Also check the radiator cap when the engine is cold. There may also be evidence of oil in the radiator coolant that is stuck to the radiator cap and around the neck of the radiator.
This problem will also be due to a failed cylinder head gasket or a crack in the cylinder head or both.

Whatever the cause in your case don't hesitate to have it checked out by a competent professional If you lose coolant and you allow the level to run significantly lower than normal the engine will overheat and you will cause very expensive engine damage.

Jan 24, 2016 | Cars & Trucks

1 Answer

2006 Equinox. Losing water. Over heats. Is this a thermostat or water pump problem??


Depends on where the coolant is going.
If it is an external leak it could be a leaking water pump. If there are no external leaks and you are loosing coolant, it could be a blown head gasket. Especially if the engine has already overheated once.
A sticking thermostat would cause the engine to overheat and then loose coolant from the overflow tank. But not until it overheats.

Oct 06, 2015 | Cars & Trucks

1 Answer

Loosing a lot of coolant


it has to be either leaking somewhere, or it is going through the engine-check passenger floor for heater core leak, or a hose/clamp leak near or over the exhaust. Is the system holding pressure when hot? {squeeze the upper radiator hose when hot, you should feel it as a solid hose, that is not collapsed}. If you have pressure, it is some sort of external leak if you do not see smoke coming out the exhaust.

Mar 16, 2014 | 2007 Chevrolet Uplander

1 Answer

Loosing coolant on 2000 lincoln ls 3.9 engine


Yes the most often cause if there are no external leaks is a leaking head or intake gasket.

Jan 30, 2014 | 2000 Lincoln LS

2 Answers

Dodge nitro leaking coolant slowly. Wil it last much longer


A lot depends on where the leak originated. If it's the water pump, it will only get worse, circulation will be impaired, engine can easily overheat...won't ;last long.
If it's an external leak, and you don't let the coolant get too low, it can go a l;ong time, with daily or regular topping up of the radiator.
If it's a blown head gasket and leaking internally, its days are definitely numbered. If its a head gasket and leaking externally, a little safer, but iffy: the head gasket may keep eroding and the leak get bigger. Overheating of the engine may occur.

Nov 25, 2012 | Dodge Nitro Cars & Trucks

1 Answer

What do the service codes P1281 and P0455 mean?


P1281
Engine is Cold Too Long
Engine coolant temperature remains below normal operating temperatures during vehicle travel (Thermostat).
P0455 (M)
Evaporative Emission Control System Leak Detected (large leak)
A large leak has been detected in the evaporative system. See TSB 25-001-02. Also, possible faulty or loose gas cap. Note: The respective Powertrain Diagnostic Procedures Manual will direct the technician to determine if the vehicle evaporative system has an external system leak. Examples of some external system leaks are: a loose gas cap, a disconnected evaporative system hose, or a loose hose connection. Remember that the evaporative system may also have an internal system leak. This internal leak may be caused by an intermittent or permanently stuck open Duty Cycle Purge (DCP) valve. This leak source is considered to be internal because any escaping emissions enter into the engine system and not directly into the atmosphere, unlike an external leak. An internal leak may cause one of the above DTC?s. Possible causes of a stuck open (intermittent or permanent) DCP valve are: 1. Corrosion due to system moisture or possible water intrusion into the system.
P0455 usually a loose/faulty gas cap or cracked or broken hose to the EVAP canister or purge valve.

P1281 The engine coolant temp is too low probably a bad thermostat.

Hope that helps

Oct 12, 2010 | 2003 Jeep Grand Cherokee

1 Answer

Overheating sebring


Don't worry about filling a cylinder with coolant. If coolant goes into a cylinder, you will need to remove the head anyway to replace the gasket. The coolant itself will not damage anything unless you try to run the engine.
If that is somehow necessary you can purge the coolant by removing the plugs ans spinning the engine over (put rags over the plug holes or it will go everywhere)
You should not drive it 'till you find the leak or if the problem isn't serious, it will be.

Feb 13, 2010 | Chrysler Sebring Cars & Trucks

1 Answer

Blown head gasket


Look the engine over and see if you can find any external leaks, change the thermostat and make sure that fan(s) are operating.
Check the oil for water...loosing that much, it has to show up somewhere. Blown headgasket usually puts oil in coolant or coolant in oil, causes an external leak from between head and block or goes out through the tailpipe as steam.
look carefully and you will find your problem!!

Apr 27, 2009 | 1991 Toyota Previa

1 Answer

This is in conection with my previous question. how many kilometers, anyway, would a water reserve empties or reaches its minimal level? thank you very much!


The coolant system is a closed system. When the system is full the reservior acts as an expansion container. When the engine heats the coolant expands. The coolant expands into the reservior when the pressure cap releases. As the engine cools the coolant contracts and the radiator cap allows the coolant to flow back into the engine. If you are having coolant loss it should show as an external leak If there is no external leak it could be possible to have an internal leak. In theory this system should not lose anything but coolant loss on a small basis is expected. If your coolant loss is great and it is not seen externally I suggest that a pressure test involving engine components be done. I hope this can help Moe

Apr 24, 2009 | 1993 Honda Civic 4 Door

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