Question about 1996 Mercury Mystique

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Thermostat? My 1996 V-6 Mercury Mystique started to overheat and the check engine and oil light came on so my husband put antifreeze in the reserve and it started overflowing from there. Is this a thermostat problem?

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Sounds like the head gasket is no good.pressure is getting into the coolant and overpressurising the resevoir.
if coolant is in the oil,low oil pressure triggered the oil light and check engine trigger results from lost compression.
a compression test will tell you.take a look at the coolant,is there oil in it?

Posted on May 09, 2009

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6ya6ya
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Posted on Jan 02, 2017

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Can my fuze for fan on radiator be bad


first change thermostat , when filling with coolant let the cap away start engine then fill her up until thermostat open then put back the cap ,, fill the reserve tank to the mark.

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Just because you replace hose, this should not have overheated engine. You need new automatic tensioner pulley.

Because you overheat, you need to have a pressure test done, you could have warped the heads.

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1999 Mercury Mountaineer 'check engine' light came on after a very cold night. checked oil and antifreeze. oil was 2 qts low and antifreeze was to the top. light won't go off


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May 12, 2010 | 1996 Mercury Mystique

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Smelled mild burning, lost antifreeze - engine temp Hot. I looked under car and noticed a serverly frayed Belt - NOT the big surpentine belt - another small belt on the driver's side. 1999 Mercury Mystique...


For the 1999 Mercury Mystique Water Pump Belt on 2.5L V6 Engine:

Probable Causes: Belt: worn out, started slipping. Overheating caused by failure of Belt. Lost antifreeze: caused by failure of belt, not turning Water Pump Pulley, not circulating anitfreeze, which resulted in overheating.

Click on the following free direct Link. It has the Serpentine & Drive Belt Diagrams and Tensioners for your 2.5L Engine.
Scroll down the Page (about 1/3rd down) to Diagram #G99H08189, it shows the specific Water Pump Belt.
Note the Tensioner.
http://www.2carpros.com/car_repair_information/year/1999/make/mercury/model/mystique/1999_mercury_mystique_drive_belt_routing_diagram.htm

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.Com!

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Check for vacuum leaks.You can spray starting fluid around all parts of the intake.Observe idle as you do.If there is a leak the engine rpm will race higher.Also listen for hissing noise.Is the check engine light on?..If so what codes are stored..Good Luck!!!

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