Why is my mountaineer overheating and continue firing

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

Question type: Maintenance & Repair

2 Answers

87,405

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.

24,565

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
    kbro
    Reputation
    460
  • #2
    tennisshoes
    Reputation
    310
  • #3
    tuff4x4
    Reputation
    300
View All

Related Models For Sale

Used Ford Explorer
21 Great Deals out of 1,756 listings starting at $2,700
Used Ford Expedition
10 Great Deals out of 406 listings starting at $5,900
Used Chevrolet Tahoe
9 Great Deals out of 767 listings starting at $5,900
Used Lincoln Navigator
5 Great Deals out of 97 listings starting at $2,500
Used Jeep Grand Cherokee
58 Great Deals out of 5,315 listings starting at $1,900
Used Ford F-150
130 Great Deals out of 11,362 listings starting at $399
Used Dodge Durango
29 Great Deals out of 1,109 listings starting at $2,400
Used Nissan Pathfinder
26 Great Deals out of 1,113 listings starting at $6,290
Used GMC Envoy
39 listings starting at $5,995
Used Toyota 4Runner
11 Great Deals out of 509 listings starting at $7,600

Used Cars For Sale

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.