Question about 1996 Mercury Mystique

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COOLANT/WATER LEAKS FRONT BOTTOM PASSENGER SIDE. CAR WILL GET HOT IN STOP AND GO TRAFFIC. BUT WILL STAY IN THE MIDDLE TEMP WHEN ON FWY OR STRAIGHT ROAD WITH OUT STOP.

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If you are seeing coolant leaking from your car, then you have a leak. It could be the radiator, a hose, or the heater core. The other possibility is that if you are using straight water instead of water/antifreeze mix, then the water is boiling and overflowing the reservoir. I will assume this is not the case.

The car does not overheat at cruising speeds because there is enough air and coolant flow through the system to keep the engine temperature under control. When you stop and go, you lose the air flow. Check also if your cooling fan is running when the engine is warm and the car is stopped with the AC off. You should be able to hear it from beside the car.

You need to find the leak and repair it. This is a simple task. Simply get a flashlight and look for source of the green coolant. Once you have determined the source, you know which part to replace.

Posted on May 16, 2010

  • Jake Sysk Apr 28, 2014

    When Ford built 1995-1998 Mystique and ford contour they used biodegradable insulation in the wire harness There was a recall but many cars did not show the problem in time to qualify . the insulation crumbles and leaves bare wires going to the A/C compressor and the cooling fans. Fuses blow and things don't work

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2 Answers

If i just put water and no coolant could this make my car over heat


No your car will not overheat, but it is advisable to my 50% coolant on the water to prevent deposits of rust and other debris that may affect the effectiveness of the cooling system.

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Water leaking when ambient temps cool


there are 2 sources of water, one is good, one is bad.
the good is pure water from the A/C condensate tray, tube. drain.
the bad is the Green/ org kind called AF coolant.
antifreeze coolant, (only YOU know the color)

the acid test for AF coolant leaks is.... (hot ,never cold)
is:
1; drive till fully hot, 20 miles, (engine temp reaches normal on dial)
2: idle until rad fan comes on,
3: shut off engine, (safety)
4: the system is now at 14PSI pressure
5: any leaks are now in full view (assumes not in engine oil side)
all you do is stand there, and look for 10mins.
all hoses, the RAD , all coolant lines. (hot lines are coolant)
and the block -head split , no leaks.
on the passenger side carpet (heater core leaks)

if you look , you will see the leak. and the exact source.
it is very easy to do this, hands i pocket,


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1 Answer

My temperature guage stays in the middle, is this ok?


Yes, the temperature gauge should normally stop in the middle, between the cold and hot points on the gauge. When the engine is cold the thermostat will be closed and will keep recirculating the coolant in the engine block until it warms up sufficiently. Then the temperature of the warm coolant will cause the thermostat to open the channel to the radiator to get rid of excess heat, which should stop the coolant from over heating. So the effect of the thermostat keeps the coolant at a fairly stable temperature. When the coolant runs low, it can't transfer enough heat to the radiator and the coolant and engine then over heats. Watch for radiator leaks under your car after you have been driving it. If the coolant goes low again fairly quickly you could have a leak in a hose or the radiator itself.

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CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.

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Good Luck!
~Brandon

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1996 Jeep cherokee, leaking coolant when cold/ hot ok.


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Sounds like the water pump, it will fling coolant as it leaks when the engine is running, also check the heater hoses and if coolant seems to come from the bottom of car and not the engine then it is a heater core leak.

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