Antifreeze and Engine Coolant
Cadillac Seville
Ford Windstar LX
Ford Bronco II XL

What could cause oil in your coolant overflow and radiator but no coolant in oil in a 91 Seville?

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2008-11-14 01:03:21
2008-11-14 01:03:21

COULD BE ATF LEAK TRANNY FLUID GETS COOLED BY RADIATOR MAYBE BAD RAD. CAR RUNNING HOT?

91 Seville's use coolant tabs from factory, that can lead people to think they have engine problems. You should have your car a check by a mechanic who can use special tools to check for blown head gaskets or other problems.

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Related Questions


The radiator cap could be the cause of coolant reservoir overflow or backup. Have the cap checked to see if it is bad.

Only if the coolant is leaking from the heater core, but you will see this.

Yes, stop leak turns into a thick substance to plug any leaks, when it ends up in the overflow bottle it turns into sludge there.

If the radiator is cracked then the vehicle has ran dry on coolant. This would cause the radiator to crack if there wasn't any coolant.

Engine coolant temperature is cooled by the radiator, moved by a water pump and controlled by a thermostat. If there are troubles with any of those components the coolant will boil Also if the head gasket goes bad gasses from combustion inside the engine will get into the coolant and cause it to boil.

There could be several reasons. Under normal operation, the vehicle will experience this as the coolant heats up and expands into the over flow. A bad water pump, low level of coolant, as well as a clogged radiator could also cause this problem.

Could be a leak in a radiator hose, or radiator. ==Answer 2, Another Possibility== It could also be the radiator cap pressure relief valve action which vents coolant and/or coolant vapor to the coolant overflow reservoir/tank when steam is created in the coolant passages in the engine block. When the engine is shut off, the residual heat in the block can cause the additional pressure and/or steam.j3h.

Low coolant or an inoperative radiator fan.Low coolant or an inoperative radiator fan.

Often the cause for loss of heat in a vehicle is low coolant levels. Double check the coolant levels in your radiator overflow tank (unless it is a system flush never add fluid directly to your radiator) and refill it if neccessary. Do this while the engine is running for best results.

I suspect that the transmission cooler that is built into your radiator has leaked fluid internally into the coolant part of the rad and into the rest of the cooling system.

There are a number of reasons: 1. Faulty thermostat can cause the fluid to overheat and expand; thus causing the fluid to vent from the overflow pipe. 2. A punctured radiator hose, or a broken seal can cause loss of fluid. 3. Damaged radiator core.

Low oil causing the coolant to heat up to the point in which it's doing more harm than good so it's pushed into the overflow

Normal causes are low coolant and an inoperative radiator fan.Normal causes are low coolant and an inoperative radiator fan.

too much water added the overflow is designed to let out water.onece the radiator reaches the required pressure,the excess water is exhausted thru the overflow

The coolant sensor is in the overflow tank, make sure it is full to the cold line. If it still stays on the level sensor might need replacing

The system was overfilled and purged the excess coolant.

No. Excessive pressure will not cause the water to boil off quickley. It will cause the radiaor hose or other components to burst causing loss of coolant. A bad radiator cap can cause high or low pressure; low pressure will cause the coolant to boil at a lower temperature.

The most likely cause of this is a blown head gasket dumping oil back into the coolant passages. The oil will mix with the glycol in the antifreeze and make a thick yellow paste. It is very important to flush the cooling system after the repair or this sludge will cause heating problems.

Yes, if it is not holding pressure or is allowing a coolant leak.

An incorrectly fitted radiator cap can allow coolant to escape the system.

First, where is it leaking. If you smell coolant inside the car, the windows mist up with a "slimy" film, or the front carpet/floorboards are wet, you likely have a bad heater core-the "mini-radiator" under the dash that provides heat and defrost. Does the car leave green puddles where it is parked? It could be leaking from the radiator, hoses, or water pump-you have to look for green (or orange, depending on the type of coolant used) drops or dried residue-a healthy car should have none. If there are no drips or puddles, the car could be leaking coolant into the cylinders via a leaking head gasket. Usually this is accompanied by poor performance and white "puffing" from the tailpipe when the engine idles. Another common cause is a bad radiator cap, if the coolant bottle shows signs of cooland coming out of the overflow drain, a cap with a weak spring could be allowing coolant out of the engine when it shouldn''t. Finally, ensure the engine isn't overheating, as this can cause the overflow condition just mentioned.

Most commonly this is due to overheating or a blown head gasket. Overheating causes the coolant to expand, and rush into the resevoir, then overflow it. When cool, the coolant that remains will be sucked back into the engine. A blown head gasket can cause the coolant to enter the firing chambers of the engine then be blown out the tailpipe, or the compression can leak into the coolant area and push the coolant out, or allow the coolant to get into the oil pan.

It could be the radiator is clogged. The thermostat could be bad (prevents the coolant from circulating from radiator to engine block)


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