Loosing anti freeze 2001 tauras did pressure and head gasket check both passed what can it be

Many possible causes. Leak can be when you drive, but not show on your driveway. The heater could be leaking into the passenger area, though you'd likely smell the "maple syrup" smell of anti-freeze.

It's also possible that you have a head gasket leak into the coolant, causing the overheating, and blowing some of your coolant out. Get a compression test on the cooling system, and a compression check on the cylinders.

Pressure test the radiator for leaks if it holds pressure start the engine. And check if pressure rises and keeps rising ,if it does it points to blown gasket or cracked head. A faulty thermostat can make it over heat so check it out . I would not mix the anti freeze as a lot of them don't mix well. put the anti freeze in all year as it stops corrosion of the cooling system.

white smoke is caused by water entering or anti-freeze entering cylinder. if in radiator or recovery tank, it will look like a chocalate milkshake. check on oil dipstick for traces of water or anti-freeze. possible causes, head gasket, intake gasket, etc. check close for a bad gasket.

Yes - Blown head gasket. Pull the plugs and look for an extra clean one. Though it's possible the pressure is bleeding one way only, esp. if you do not see very steamy exhaust.

Cylinder pressure test should point out where it is.

Sounds like a blown gasket. The pressure at combustion chamber varies from 75 in idle up to 150 in higher RPM. If the cylinder head gasket is blown, then gases are blown into the cooling system, increasing the pressure, the radiator cap pressure relief valve is open and coolant is discharged in the coolant bottle. In such cases it is common for the coolant bottle to boil. You can observe gases discharging in the bottle, mixed with coolant, from the cooling system. These are symptoms of a blown cylinder head gasket.
To find it out you have to perform cylinder compression test on your car. Start with a normal ("static") compression test. If you will find low or zero pressure in one cylinder this might be a bad ring, valve or cylinder head gasket
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this is usually caused by anti freeze getting into combustion chamber. a blown head gasket will cause this. check the oil and see if anti freeze is getting in it. if its in oil you will see water droplets on oil stick. does the vehicle run bad, does it misfire, are you looseing power. these are the signs of a bad headgasket. does anti freeze disappear in cooling system, does it smoke all of the time!! if so its probably the head gasket, if above symtoms are there.

have it pressured checked for leaks.









TIM............

Jennipherbrr,

1. Make sure the car is cold. Remove the radiator cap (press & turn about 1/4 turn to remove pressure in the system) Once the pressure is bled off you can remove cap and leave it rest on the filler opening.

2. Find the petcock on the radiator (the little valve attached to the radiator. You have to open/turn clockwise to drain the anti-freeze. Drain anti freeze below thermostat housing. About 1/2 to 1 gallon.

3. Have a catch basin for the anti freeze under the car. Remove upper radiator hose from radiator and thermostat housing.

4. Remove thermostat housing from engine block (usually two or three bolts in the thermostat housing). Scrap off ALL old gasket material from engine block. Double check and make sure all gasket material is removed from surface. If not the thermostat housing will leak.

5. Install new gasket with some high temp silicone. Place a couple of dabs on the thermostat housing and gasket (the silicone is used to keep the gasket in place) *MAKE SURE YOU INSTALL the thermostat the same way you took it out. Don't over tighten the thermostat housing bolts.

6. Remove the radiator cap and replace the anti freeze you removed (make sure the anti freeze is clean). Fill the radiator to the top of the filler neck and replace the radiator cap (push and turn the radiator cap to the right- like a pill bottle). Start the car and make sure the temperture guage goes up. The guage pointer should be in the middle of the guage.

7. Check the radiator reservoir for proper anti freeze level. DO NOT OPEN THE RADIATOR CAP WHEN THE CAR IS HOT!!! THE ANTI FREEZE IS HOT AND WILL BURN YOU.

Hope this helps

you have either a cracked head or a cracked block, there is no other way to explain this assuming the head gasket is good and the oil cooler doesn't leak.

Cracked head or head gasket will cause antifreeze to get in the combustion chamber and be ignited with the gasonline.
The white smoke when you first start lets you know of this condition. Each cylinder will need a compression check to test for leaks.
Pressure checking the cooling system does not provide you with enough information.
Its possible that your coolant is slowly being burned off in the cylinders possibly caused by a blown head gasket or cracked head,also i would definately check your oil and see if its overfull or milky looking,usually indicates a head gasket problem also.If your intake gaskets are leaking internally your engine could be sucking it in and burning it. With no leaks coming from the vehicle these are about the only things it could be!!

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