Question about 1996 BMW 318

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2001 BMW 318i se Coolant loss only when driven no signs of external leaks or loss of pressure when using a coolant pressure tester oil seems slightly off colour. Do these have an oil cooler or am i looking at a headgasket problem.

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Check the cap on the coolant ,i had same prob. if the cap is loose the level of water will change.tighten the cap it can be somthing as simple as that.

Posted on Nov 03, 2008

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Sounds like headgasket , when it si done you must make sure you fill with water and no aIR BUBBLES IN SYSTEM .i did one once took me 4 hours with a hose pipe ramming water into it heater matrix first then engine .i had a garage do the gasket 1st time they did not fill with water properly and it blew had to do it myself

Posted on Aug 13, 2008

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Things to test when checking cooling system


<p>A leak detection additive is available through the parts department that can be added to cooling system. The additive is highly visible under ultraviolet light (black light) (1). Pour one ounce of additive into cooling system. Place heater control unit in HEAT position. Start and operate engine until the radiator upper hose is warm to touch. Aim the commercially available black light tool at components to be checked. If leaks are present, black light will cause the additive to glow a bright green color.<br /> <p>The black light can be used in conjunction with a pressure tester to determine if any external leaks exist .<br /> <p><b>PRESSURE TESTER METHOD</b><br />he engine should be at normal operating temperature. Recheck the system cold if the cause of coolant loss is not located during the warm engine examination. <br /> WARNING <p> HOT, PRESSURIZED COOLANT CAN CAUSE INJURY BY SCALDING.<br /> <p>Carefully remove the radiator pressure cap from the filler neck and check coolant level. Push down on cap to disengage it from the stop tabs. Wipe the inside of filler neck and examine the lower inside sealing seat for nicks, cracks, paint, dirt and solder residue. Inspect the radiator-to- reserve/overflow tank hose for internal obstructions. Insert a wire through the hose to be sure it is not obstructed.<br /> <p>Inspect cams on the outside of filler neck. If the cams are damaged, seating of the pressure cap valve and tester seal will be affected.<br /> <p>Attach pressure tester (7700 or an equivalent) to radiator filler neck (1).<br /> <p>Operate tester pump to apply 103.4 kPa (15 psi) pressure to system. If hoses enlarge excessively or bulge while testing, replace as necessary. Observe the gauge pointer and determine the condition of the cooling system according to the following criteria:<br /> <p><b>Holds Steady:</b> If the pointer remains steady for two minutes, serious coolant leaks are not present in system. However, there could be an internal leak that does not appear with normal system test pressure. If it is certain that coolant is being lost and leaks cannot be detected, inspect for interior leakage or perform Internal Leakage Test. Refer to <a>INTERNAL LEAKAGE INSPECTION</a>.<br /> <p><b>Drops Slowly:</b> Indicates a small leak or seepage is occurring. Examine all connections for seepage or slight leakage with a flashlight. Inspect radiator, hoses, gasket edges and heater. Seal small leak holes with a Sealer Lubricant (or equivalent). Repair leak holes and inspect system again with pressure applied.<br /> <p><b>Drops Quickly:</b> Indicates that serious leakage is occurring. Examine system for external leakage. If leaks are not visible, inspect for internal leakage. Large radiator leak holes should be repaired by a reputable radiator repair shop.<br /> <a></a> <p><b>INTERNAL LEAKAGE INSPECTION</b><br /> <p>Remove engine oil pan drain plug and drain a small amount of engine oil. If coolant is present in the pan, it will drain first because it is heavier than oil. An alternative method is to operate engine for a short period to churn the oil. After this is done, remove engine dipstick and inspect for water globules. Also inspect the transmission dipstick for water globules and the transmission fluid cooler for leakage.<br /> <br /> WARNING <p> WITH RADIATOR PRESSURE TESTER TOOL INSTALLED ON RADIATOR, DO NOT ALLOW PRESSURE TO EXCEED 145 KPA (21 PSI). PRESSURE WILL BUILD UP QUICKLY IF A COMBUSTION LEAK IS PRESENT. TO RELEASE PRESSURE, ROCK TESTER FROM SIDE TO SIDE. WHEN REMOVING TESTER, DO NOT TURN TESTER MORE THAN 1/2 TURN IF SYSTEM IS UNDER PRESSURE.<br /> <p>Operate the engine without the pressure cap on the radiator until the thermostat opens. Attach a Pressure Tester to filler neck. If pressure builds up quickly it indicates a combustion leak exists. This is usually the result of a cylinder head gasket leak or crack in engine. Repair as necessary.<br /> <p>If there is not an immediate pressure increase, pump the Pressure Tester. Do this until indicated pressure is within system range of 110 kPa (16 psi). Fluctuation of gauge pointer indicates compression or combustion leakage into cooling system.<br /> <p>Because the vehicle is equipped with a catalytic converter, <b>do not</b> remove spark plug cables or short out cylinders to isolate compression leak.<br /> <p>If the needle on the dial of pressure tester does not fluctuate, race engine a few times to check for an abnormal amount of coolant or steam. This would be emitting from exhaust pipe. Coolant or steam from exhaust pipe may indicate a faulty cylinder head gasket, cracked engine cylinder block or cylinder head.<br /> <p>A convenient check for exhaust gas leakage into cooling system is provided by a commercially available Block Leak Check tool. Follow manufacturers instructions when using this product.<br /> <p><b>COMBUSTION LEAKAGE TEST - WITHOUT PRESSURE TESTER</b><br /> <p>DO NOT WASTE reusable coolant. If the solution is clean, drain the coolant into a clean container for reuse.<br /> <br /> WARNING <p> DO NOT REMOVE CYLINDER BLOCK DRAIN PLUGS OR LOOSEN RADIATOR DRAINCOCK WITH SYSTEM HOT AND UNDER PRESSURE. SERIOUS BURNS FROM COOLANT CAN OCCUR.<br /> <p>Drain sufficient coolant to allow thermostat removal(Refer to 7 - COOLING - STANDARD PROCEDURE). Remove accessory drive belt or (Refer to 7 - COOLING/ACCESSORY DRIVE/DRIVE BELTS - REMOVAL).<br /> <p>Add coolant to radiator to bring level to within 6.3 mm (1/4 in) of the top of the thermostat housing.<br /> <br /> CAUTION <p> Avoid overheating. Do not operate engine for an excessive period of time. Open draincock immediately after test to eliminate boil over.<br /> <p>Start engine and accelerate rapidly three times, to approximately 3000 rpm while observing coolant. If internal engine combustion gases are leaking into cooling system, bubbles will appear in coolant. If bubbles do not appear, internal combustion gas leakage is not present.

on Jan 20, 2011 | Subaru Legacy Cars & Trucks

1 Answer

Engine coolant level drops on Mercedes C180 2001 model


Loss of coolant is serious because if you allow your engine to overheat you can cause very expensive engine damage - thousands of dollars of damage (not hundreds).

The items that need looking at are:

- Radiator cap is old and faulty. This can allow coolant to escape and needs to be replaced every 4 or 5 years (sometimes sooner) with the correct spec cap - not any old product picked up at some auto store.

- External leak - you need to check all flexible coolant hoses and connections for leaks as well as around the water pump to ensure the WP gasket is not leaking

- Internal leak
The most common is a blown cylinder head gasket which can allow coolant to escape and to get into the cylinders and into the lubrication system. If getting into the cylinders you will see white smoke coming from the exhaust . You need to check the engine oil for coolant contamination as a coolant can escape into the lubrication system via a damaged head gasket. You also need to check the coolant for signs of oil escaping under pressure via the blown head gasket into the cooling system.

An internal leak can also be caused by a cracked cylinder head but if you have this condition are blown head gasket will have probably occurred around the same time.
-

Dec 27, 2012 | Cars & Trucks

2 Answers

2001 996 turbo, slight coolant leak from the front of the motor,


to save money go rent a radiator pressure tester pump up the system to 12-15 lbs then take a light and search for a coolant leak check hose connections, water pump, radiator itself. if you are not comfortable looking for the leak call a buddy to help. you will also be able to locate the leak by looking all over the motor for a little yellow river that heads to the ground

Jun 03, 2012 | Porsche 996 Cars & Trucks

1 Answer

I have a 2001 Oldsmobile Intrigue that has a small coolant leak. It appears to be leaking somewhere under the motor on the drivers side of the vehicle. I ran it up yesterday and the fans seem to cycle...


Could be intake gaskets, Use a rad. cap/rad. pressure tester, dont pressurize system higher than the rad cap is rated for(psi). You might find the leak that way.

Nov 11, 2010 | 2001 Oldsmobile Intrigue

3 Answers

My low coolant light keeps coming on


The thermostat must be failing. Consider replacing it.

Jan 03, 2010 | 2002 Buick Century

1 Answer

I had a coolant loss problem, we replaced the head gasket, had the head pressure tested, put everything together and we still have a coolant loss, could it be the turbo which is water and oil cooled? or...


dear friend- your turbo is not oil coold,but if you put a pressure tester on pump it ti 15psi and then let it stand for a while look for external leaks if nothing see if the pressure has dropped,if no external leaks were found and the pressure has dropped,it must be internal,if the pressure did not drop then i think the water cap is faulty.

Nov 09, 2009 | 1996 Saab 9000

1 Answer

97 BMW 316 Auto, using alot of engine coolant, no signs of leaks


Check exhaust, sounds like a small head gasket leak.

Mar 18, 2009 | 1997 BMW 318

1 Answer

Regular coolant loss, in Mk 5 Golf


Chris I would get the coolant system pressure tested and it might show up the problem

Jan 08, 2009 | 2005 Volkswagen Golf

1 Answer

Coolant leak


You should be able to, so yes. If you have a coolant leak the pressure will build and slowly decrease or it will not get to the correct pressure. Unless the leak is in the radiator cap itself as the pressure tester generally uses a different cap.

Nov 11, 2008 | 1998 Cadillac Catera

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