Why is my mountaineer overheating and continue firing

Asked by Apr 03, 2017 at 08:14 PM about the 1998 Mercury Mountaineer 4 Dr STD AWD SUV

Question type: Maintenance & Repair

2 Answers

82,085

Over heating can be due to a bad thermostat, a plugged radiator, a bad water pump. and a bad head gasket. The engine would continue to run, fire until it locked up if it overheated to the point of locking the engine up.

23,035

If it is running after you turn it off (dieseling" or "run-on). When you shut the ignition off a couple of the cylinders to keep igniting, which in turn keeps the engine running, although "sputtering" pretty badly. This can be caused by excessive carbon build-up in the combustion chambers or on the piston tops which when hot, acts like little glow plugs. This is common on engines that run way too rich or have oil burning problems. Dieseling is a common problem with high compression / high performance engines, especially in warm weather or when the engine is hot. In this case, it is usually caused by running "cheap" gas with inadequate octane. In this case it can usually be remedied by switching to a higher octane fuel. In your case its because its running hot. Need to fix the issue before you end up warping a head & blowing a head gasket, in-fact I would go ahead and perform a compression check on all cylinders and a exhaust in coolant test too make sure it has not yet of if it has already decide if you want to fix or buy another car as its costly to repair if a shop does it (labour wise).

Your Answer

Mercury Mountaineer Experts

  • #1
    Tom Demyan
    Reputation
    610
  • #2
    kbro
    Reputation
    460
  • #3
    tuff4x4
    Reputation
    300
View All

Related Models For Sale

Used Ford Explorer
780 Great Deals out of 64,899 listings starting at $1,000
Used Ford Expedition
429 Great Deals out of 21,231 listings starting at $1,000
Used Chevrolet Tahoe
528 Great Deals out of 36,442 listings starting at $1,299
Used Lincoln Navigator
79 Great Deals out of 3,864 listings starting at $1,995
Used Jeep Grand Cherokee
771 Great Deals out of 75,663 listings starting at $899
Used Ford F-150
2,282 Great Deals out of 214,917 listings starting at $1,300
Used Dodge Durango
226 Great Deals out of 25,238 listings starting at $800
Used Nissan Pathfinder
290 Great Deals out of 24,065 listings starting at $1,500
Used GMC Yukon
330 Great Deals out of 19,979 listings starting at $1,400
Used Toyota 4Runner
253 Great Deals out of 33,137 listings starting at $950
Used Mercury Grand Marquis
23 Great Deals out of 1,206 listings starting at $1,200

Used Cars For Sale

2010 Mercury Mountaineer For Sale
54 listings starting at $5,700
2009 Mercury Mountaineer For Sale
12 listings starting at $6,988
2008 Mercury Mountaineer For Sale
104 listings starting at $3,900
2007 Mercury Mountaineer For Sale
129 listings starting at $3,995
2006 Mercury Mountaineer For Sale
103 listings starting at $5,518

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.