Engine Cooling System Problems of Mercury Mariner Hybrid

While traveling on an interstate highway, car lost power, speed declined to 25 mph and went into hybrid mode. "pull over safely" light went on. We pulled over and turned off engine. After a few minutes it restarted and we were able to drive the car at normal speed. The outside temperature was high--in the 90s--and the air conditioning was on high when the power failed. We had a similar incident about a month earlier while trying to park the car on a hot day with air conditioning on. . Speed was minimal because we were parking but car lost power and pull over safely light went on. After second incident we took car to a Ford dealer who said the hybrid system cooling pump had failed and needed to be replaced. Cost to replace the pump was $470.

See all problems of the 2008 Mercury Mariner Hybrid 🔎.

Driving at highway speeds, vehicle suddenly shut down and displayed a "stop safely now" message on the lcd and a warning light on the dash. The engine just shut off completely, no electric drive either. Extremely dangerous condition. This happened twice. Vehicle restarted within a minute and operated normally for about 30 minutes. This is a common problem with the Mercury mariner and Ford escape versions of this vehicle. . Read more...

See all problems of the 2006 Mercury Mariner Hybrid 🔎.

Vehicle was in middle lane of interstate 95 with traffic moving at 65-70 mph when there was (according to Ford tech) a failure of the motor electronics cooling pump. This caused the vehicle engine to shut down and could have caused accident/death if wife wasn't able to get to shoulder weaving through lanes of traffic. . Read more...

Was driving - when stop safely now message appeared on display, engine had shut off, pulled over, waited a minute, restarted engine, drove a couple of blocks, stop safely now message reappeared, did this several times in the few miles to home. Took car to dealer next morning. Replaced the cooling system pump.

See all problems of the 2007 Mercury Mariner Hybrid 🔎.

The contact owns a 2008 Mercury Mariner Hybrid. The contact stated that while driving approximately 65 mph, the stop safely now warning light and the temperature light illuminated on the instrument panel. The vehicle then suddenly stalled. The contact was able to restart the vehicle. The failure occurred intermittently and only when driving at highway speeds. The vehicle was taken to the dealer for a diagnostic test. The technicians stated that there may be a failure with the cooling pump, but would inspect the vehicle to verify the failure. The vehicle was not repaired. The approximate failure mileage was 66,000.

The engine abruptly stopped while I was traveling 65 mph. The car was towed to a Ford dealer who diagnosed the problem as the "motor electronics cooling pump. " the part was replaced but was not covered by the warranty. Ford issued a technical service bulletin in November 2008 concerning this problem, so Ford has been aware of this danger for years.

Vehicle's gas engine shut off on the freeway at 65 mph without warning leaving only the electric motor to power it. The reduced the maximum speed to 25 mph. Dealer said failure of the motor electronics cooling pump caused the loss of power.

Vehicle shut down while driving on the interstate, immediately losing all power. Message on dash read "stop safely now". This is a very dangerous issue. Driving on the interstate at 65 mph & losing all ability to accelerate or maintain speed is very scary. Making matters worse, this occurred during a pouring rainstorm & in a construction zone. I pulled over and turned off ignition. I was able to restart the vehicle. It then shut down repeatedly every 2 miles. The only way to restart was to pull over and turn off the ignition. I gimped it to the car dealer. Now have a $700 bill to fix the airflow mode door actuator and the motor cooling pump. We were told there was a short that was keeping the cooling pump from working. Thus the engine was overheating and shutting off. Having read similar complaints, I am concerned that this is a common issue with this vehicle.

2008 Mariner Hybrid / 67000miles. Engine failure. Was able to limp off highway. After waiting several minutes car restarted and was able to drive approx. 5 miles before it shut off again. Drove to dealer with several shutdowns. Dealer states car needs electronic cooling pump and cht sensor at a cost of $1275. 00. Car is still sitting in dealership waiting for my decision to repair or not. Car was not abused. Mostly only one passenger. Car was serviced regularly as per specs at dealership.