1998 Ford Windstar Engine overheats

Tiny
TANK72CZ
  • MEMBER
  • 1998 FORD WINDSTAR
  • 3.0L
  • V6
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
My engine overheats to the max after 10 minutes of Running at idle, and the reservoir tank overflows with coolant.I replaced the thermostat and the radiator cap (16 ponds) according to engine specifics, I also flushed the radiator disconnecting the upper and lower hose and poring water through the upper horse until clear water came out, no coolant leaks.I don't know why the reservoir tank overflows. Please your help in telling me what might be causing this overheating problem.

Thanks
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Monday, December 9th, 2013 AT 6:37 PM

3 Replies

Tiny
CARADIODOC
  • EXPERT
Leaking cylinder head gasket. Common problem and common symptom. Your mechanic can do a chemical test at the radiator to verify that.
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Monday, December 9th, 2013 AT 6:44 PM
Tiny
TANK72CZ
  • MEMBER
Is it possible to find oil in the coolant reservoir tank and not coolant mixed with oil in the engine if the cylinder head gasket is blown. Shouldn't be in both?
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Monday, December 9th, 2013 AT 7:24 PM
Tiny
CARADIODOC
  • EXPERT
It's possible for fluids to mix but that is by far the least common symptom. There's oil draining back under no pressure, oil being pumped to the valve train under about 40 pounds of pressure, coolant under 15 pounds of pressure, and combustion gases under hundreds of pounds of pressure intermittently. Antifreeze becomes acidic due to the normal seepage of combustion gases into it. It has a number of additives including corrosion inhibitors that wear out in about two years. Because of that acid, and the high pressure in the cooling system, that is where most corrosion and leaks occur. It's not common for any oil passages to be involved with that leakage.

When there is a leak between the cooling and oiling systems, which fluid goes where depends on a number of things. Oil at 40 pounds of pressure might get pushed into the cooling system, but when the engine is stopped and still hot, the coolant will stay at 15 pounds for a minute or two, and that may not be long enough or high enough pressure to push coolant into the oil.
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Monday, December 9th, 2013 AT 9:44 PM

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