Mercury Mariner overheating problems

Filed Nov 29, 2025 · Engine · CA

90sWhile driving, the vehicle will suddenly display a warning message that says “Stop Safely Now”. When this message appears, the hybrid system overheats and the vehicle immediately loses power. The gasoline engine and electric motor both shut down without warning, even at highway speeds. I am forced to coast to the side of the road, which is extremely dangerous in traffic. This happens after the vehicle has been driven for a short period of time. The cooling fans appear to be running, but the hybrid electronics system overheats and triggers the shutdown safety mode. After waiting for the vehicle to cool down, it will restart, but the problem continues every time the car reaches normal driving temperature. This issue matches the symptoms covered under Ford’s previous safety actions and customer satisfaction programs for the 2005–2008 Ford Escape and Mercury Mariner Hybrid (hybrid electronics overheating and shutdown). The dealership states that no recall appears under my VIN, but the safety failure is identical. The vehicle becomes unsafe and inoperable with no advance warning beyond the brief “Stop Safely Now” message. This defect poses a serious risk of a crash, injury, or death due to the sudden loss of propulsion in traffic.

Filed Feb 28, 2020 · Brakes, Steering · 167,996 miles · FL · crash · 2 injuries

Recall for coolant pump on hybrid system could result in hybrid electronic overheating causing a stall like condition recall was addressed by dealership back on 7/20/2015 2nd owner has had vehicle for 9 mnths - have had 3 incidents of vehicle shutting down with dash light advising to pull over for safety and the system shutting down directly after - brakes /steering etc. For the first incident - towed to local dealership - unable to diagnose 2nd incident - to a reputable local mechanics shop - changed out normal vehicle battery 3rd incident - caused driver to roll through an intersection on a red light - struck by other vehicle

Filed Aug 19, 2019 · Electrical, Fuel system · 120,000 miles · CA

Ford's recall "code 14s19" on 2005-2008 mariner hybrids and escape hybrids should cover all of these hybrids but it has exceptions! Ford has issued a recall on *some* of the 2005-2008 ford escape hybrids and *some* of the corresponding mercury mariner hybrids. However they are refusing to issue a recall on my particular 2008 mariner hybrid (which is exhibiting the electronic overheating problem described in the recall where the stop safely now comes on and there is an immediate loss of power). They are refusing to fix my mariner just because the VIN number does not match the particular manufacturing lot covered by the original ford recall - though my SUV does fall in the date range mentioned in the recall) I am certain this recall should cover more hybrid SUV than ford has admitted to, and since the mariners had a very limited production run, it is less likely that there wil be a significant number of complaints due to this very serious life threatening issue - and I would like to emphasize that there have been numerous complaints about this including on the federal safety agency. Ford should expand this recall to include all defective ford escapes and mariner hybrids before serious accidents start occurring as a result of vehicles shutting off during operation because of either drive electronics over heating due to a bad coolant pump, (and possibly other causes?). ----relevant recall-- the federal safety agency vehicle safety recalls recall number 14v526000 recall date 09/03/2014 component hybrid propulsion system ford contact number for recalls 1‑866‑436‑7332. Relevant links:

Filed Jul 23, 2018 · Transmission · 56,000 miles · OR · fire

Tl* the contact owns a 2010 mercury mariner which was being towed by a 2004 fleetwood tioga montara. While driving approximately 60 MPH, the contact noticed smoke coming from the hood. The motor home was pulled over, the contact opened the hood, and noticed that the transmission overheated without warning. The vehicle was taken to chuck colvin ford nissan (1925 n hwy 99 w, mcminnville, or 97128, 503‑472‑6124), but was not diagnosed or repaired. The manufacturer was made aware of the failure and stated that the failure was a known occurrence with the transmission at approximately 50,000 miles. The failure mileage was approximately 56,000.

Filed Oct 21, 2017 · Steering · 139,000 miles · MD

I was doing 45 miles an hour on pulaski highway when my power steering went out and I almost hit another car but when I talked to the car dealer they keep saying they worrying about getting their car payment so how do I get this fixed it was on the recall list but they said since it wasn't made in kansas it don't cover here I've been taking it to different shops and everybody talking about like a thousand to $2,000 I've been putting money in this front end for the last couple months first it was the to u-joint to connect the power steering then it was the calipers overheating now is no steering at all

Filed Jun 8, 2017 · Fuel system · 102,000 miles · AK

Tl* the contact owns a 2008 mercury mariner. The contact stated that the vehicle experienced overheating and a loss of power independently. The check engine warning indicator illuminated. The vehicle was not taken to be diagnosed or repaired. The contact received notification of the federal safety agency campaign number: 14v526000 (hybrid propulsion system); however, the contact was unable to get the remedy due to no certified ford dealers in the city. The manufacturer was notified and offered no assistance. The failure mileage was approximately 102,000.

Filed May 11, 2017 · Acceleration, Transmission · 160,000 miles · CA · crash

On the freeway and car suddenly has overdrive light blinking, at the same time I began losing power, I was able to get off freeway but not after I open hood and nearly got run over. I was checking to see if there was overheating or smoke. But nothing. I have already replaced PCM, transmission, and torque converter. Consequently my shifter is broken and you can see down into transmission. Obviously no I can't drive, I will have to have vehicle towed. Why hasn't transmission been recalled on this vehicle. I could not think about if my child would have been with me and stood in front of car. He never would have been able to move that quickly or even worse with freeway driving I even could have been hit from behind.

Filed Mar 29, 2017 · Electrical, Transmission · 133,500 miles · CA

While driving the car on a highway, the warning light chimes and displays to "safely stop vehicle". The car no longer accelerates and slows to a stop even if you don't have a shoulder to pull off to. I normally just hit my hazard lights and pull to a stop, wait a few minutes then restart the engine. This happen once a month and sometimes twice or three times in a row. If the hybrid electronics system overheats, it may shut down the powertrain, resulting in a stall-like condition, increasing the risk of a crash. There is currently a recall on this problem #14s19. Called ford and they said my vehicle isn't a part of it even though it clearly was built in the same time and has the exact issue. Very dangerous and scary problem.

Filed May 7, 2013 · Engine, Transmission · 57,000 miles · MI

I was driving to work and car began to make a loud rattle noise, od light flashed (od off) and pulled over. I attempted to pull back on road and car would not shift into 2nd gear. Transmission problem. 1800.00 repair. Now 2013 exactly 3 years later and car begins same thing all over again. Diagnostic test states needs new transmission. Told these cars have had these problems from the get go. Ford knows this! The problem is coolant is located in radiator and does not keep trans from overheating. I am now told it will be 3650.00 for another trans. This is a total mess. It is not fair to the consumer who still owes 16,000.00 on this car. I bought this car with the hopes of repairing my damaged credit and made all routine service and flushes as scheduled on time. Now what to do? I cant afford another transmission, and am without a car and continue to have a car payment or my credit that I have finally got back on track is ruined once again! Can anyone offer me advice on what to do? Help!

Filed Jun 24, 2010 · Acceleration, Brakes · 56,000 miles · OR

In december of 2009 I reported an incidence of unintended acceleration. Since then we have not been using the cruise control much. Yesterday I activated the cruise control at 60mph on a long flat area. There is a mountain pass and curves between that area and our home. I hit the brake and slowed down around the 35 MPH curves. On the down grade I took it out of over drive and dropped down a gear. The road flattens out again at the bottom but I did not reengage the cruise control. At one point at an intersection I had to brake to ten miles per hour or less for an oncoming car. Just after making a left turn onto our street the car began rapidly accelerating on its own. I didn't have my foot on the gas pedal. Since the road is straight I allowed it to accelerate to see what it would do. It went from 10 MPH to 50 MPH before my wife asked, "why are you accelerating? I replied, " I'm not. It's doing it on its own." it disengaged as soon as I hit the brake pedal. There is no way this was caused by a floor mat. I was only going about 10mph when it began accelerating and I took my foot off the pedal. The last time I complained to ford the car was under warranty and had less than 36,000 miles on it. Ford said they couldn't do anything about it since it was intermittent and they hadn't experienced the problem. Another safety problem we have had with the car: when it had 26,000 miles on it the front end began shaking when braking. Ford said the front rotors were warped and resurfaced them under the warranty. They refused to change the pads or install new rotors. About 15,000 miles later it began vibrating again at speeds above 50mph. Now the vibration is severe. We are looking at a complete brake overhaul. We have never detected the brakes being overheated while the car was being driven. Another problem we had was that the trans cooler went out at 26,000 miles. Ford installed a new one under warranty but refused to drain and replace the transmission fluid.