Question about 1998 Mercury Mountaineer

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1998 mercury mountineer temp guage is stuck in the middle of the guage. it stays there wheather the vehicle is running or engine off and ignition is off. where is the temp sending unit on engine.

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That sending unit is located on top of the thermostat housing. it is the one closer to the passenger side

Posted on Apr 11, 2010

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Hi: I read your answer to the problem with the 1999 Mercury Mistique temperature gauge. I'm having a similar problem. My temperature gauge is broken in the cold position. And, as far as I can tell,...


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1 Answer

My coolant expansion tank is overflowing after 20 minutes running


There could be a couple of reasons for this,

1. The thermostat could be stuck closed creating more pressure than normal. Your temp guage would show a higher temperature or you have another blockage in the system.
2. The expansion tank is too full.
3. The cylinder head may be leaking. If you fill the system run the engine to normal temperature with the radiator cap off, look for quite large bubbles coming out of the filler cap. If the head is badly leaking, they can be like a volcano. The temp will rise quickly from cold and the engine will overheat in a short distance.
It does seem odd that it would only spill over after 20 mins. Suspect that the expansion is over full first if your temp is normal. Let it run until it stops and see where the level is when the engine is cold.

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1 Answer

My 1990 gmc sierra 1500 temp. guage stuck after new thermostat.


Hi

Does your temp guage needle drop to Zero when you switch off ignition ?

If not, your temperature transmitter is faulty, or the wire running to it is earthing out somewhere.

Hope this is of help.

Good Luck !

John.

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