really awful
Typical Repair Cost:
No data
Average Mileage:
111,050 miles
Total Complaints:
6 complaints

Most Common Solutions:

  1. replace engine (4 reports)
  2. not sure (1 reports)
  3. replace head gaskets (1 reports)
2010 Ford Flex engine problems

engine problem

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2010 Ford Flex Owner Comments

problem #6

Jun 222018

Flex Limited 3.5L

  • Automatic transmission
  • 100,000 miles


The car had some miles 97000 .Local Dealer had tent sale on trade ins rather than sending to auction. I paid asking price with "As Is" terms. The vehicle had no oil showing on dipstick after 1000 miles. Engine light came on checked fluids, no oil on dipstick. Happened again after 2000 miles, Ford dealer had me replace ecoboost turbo relief valve and valve cover (800 USD plus $500 labor). Drove and problem was worse. Had compression test, two valves showed low compression and engine smoked. At first it was the second bank as the oil misted out the drivers side exhaust only.

Based upon the fact that this engine with ecoboost was only sold from7/ 6/2009 to 6/13/2011, the company must have realized they had a bad build on this model engine. The same engine was placed in the Lincoln MKS and the Ford Taurus. Engine 3.5L v6 DI

- Edward B., Prescott, US

problem #5

Jul 042017

Flex SEL 3.5L V6

  • Automatic transmission
  • 137,000 miles

2017 July 4th of all times. Going home from fireworks, I first noticed the Hot Engine light was on and the temperature gauge was pinned to Hot. Car seized as I was turning into the driveway of the air BnB. I turned it off 5 min then started the engine and parked it in the driveway. Next day I checked the fluids and the coolant was low. I bought some coolant from gas station and proceeded to fill the reservoir. Before I got the cap back on the coolant level was draining, I looked under the car and the coolant was gushing out. Ford service center says its a blown lower head gasket. They said if I choose to repair it, the lower AND the upper should be replaced, ballpark total cost USD$7000. I am second owner, the vehicle is a 2010, 137,000 miles on it. The value of my Flex when it was working was USD$7000 according to Kelly Blue Book. I still owe USD$5000 on it. Not sure what to do now. Service specialist says the car is in great shape, if I put in a new engine it will last another 100,000 miles. So do I drop $7K now and continue with $300/month for 17 months or do I plunk down $3K and finance a new car for $450/month for 72 months? Hmmm...tough descision. Will I ever buy another Ford? ...Maybe. I'll probably get a Toyota/Nissan/Honda made in Japan instead.

- hayfster, Apex, US

problem #4

Jul 202016


  • Automatic transmission
  • 156,767 miles

Car never had any problems. One day you go to work and when you are trying to go home the car does not turn over. Take it to the shop which is a Ford Dealership. You find out you need a compression test to find out what the problem is. They tell me that all of my cylinders do not meet the test of 100-120.

What can cause this? I take care of my car very well.

New engine is supposed to be $5000. I still would like to know what happened.

- Craig B., Upper Marlboro, MD, US

problem #3

Sep 172015

Flex SEL 3.5L V6

  • Automatic transmission
  • 100,041 miles


I was a good girl and made all my car payments on time, got all my oil changes done before the recommended 8000 km and had all work (except oil changes) done at the Dealership.

With NO ADVANCE WARNING, the car died in the middle of the road. I got it towed to "my" Dealership and just like Ali M., from Sayville, NY, I got the news that it NEEDED A NEW ENGINE SINCE THE WATER PUMP LEAKED INTO THE ENGINE CAUSING IT TO SEIZE. The cost would be $8000 to put in a rebuilt engine.

Sounds like an old car right? WRONG! I had the car for 5 years, 3 months and the odometer read 161,000 km (approx 100,000 miles). Big slap in my face from Ford.

The DEALERSHIP TRIED TO BLAME ME for not getting oil changes done there, saying that Ford would have: - noticed the coolant was low - the oil changers noticed and topped up the coolant, just like Ford would have. - noticed the oil was not the correct color – I had an oil change 3 weeks prior and they said the oil was fine.

I needed a car, so 3 hours later I was signing on the dotted line to lease a non-Ford and 2 weeks later my husband traded in his 2015 Ford F150 for a non-Ford vehicle.

WE WILL NEVER BY A FORD AGAIN; particularly when they blamed me for their bad engine design. Thanks for listening!

- Jo-Anne L., Toronto, ON, Canada

problem #2

May 152015

Flex SEL 3.5L V6

  • Automatic transmission
  • 73,000 miles

So, like many others who shell out hard earned money on a new vehicle, hope that the car will last you more then 5 years. Well my wife wanted to buy American and I didn't, but she really wanted the Flex and to be honest, I liked the car. That is until the water pump leaked internally, into the crankcase, causing the engine to seize. The car gave no sign that there was a problem until the engine made noise. We were 3 days over the 5 year warranty and 13,000 miles over the 60,000 when the engine went.

I contacted Ford in Detroit about this and after being jerked around for 5 weeks, was offered a $1000 blow off settlement to fix an $8000 job. Ford feels that 5 years is acceptable use from their car. Telling me that $7000 a year for 5 years is ok and I shouldn't expect more. Being a mechanic, and maintaining my own vehicles, this is NOT acceptable.

I informed Ford that I would no longer purchase a Ford product, nor would I recommend a Ford...they didn't care. Yes I'm mad and frustrated about this. This was the first car my wife said she loved. Who has $8000 to put into a 5 year old car that they just paid off? I don't, nor do I want to. So the Flex sits in my driveway posing as a monument to what a sh*t product we bought.

If you have taken the time to read all this, please save yourself from the heartache we are suffering through and do NOT, I repeat, do NOT buy a Ford product. I know if I bought a VW or any other foreign car, I'd still be driving it and not having a 4500lb steel monument in my front yard, Now we have the unenviable task of going to another dealership to buy another new car. I hate going to a dealership to buy a new car. Car salesman make me unhappy. Not as unhappy as Ford does, but you get the idea....thank you for taking the time out of your day to read me rant for many many lines.

- Ali M., Sayville, NY, US

problem #1

Jan 122015

Flex SEL 3.5L V6

  • Automatic transmission
  • 99,423 miles

I was driving to work on 1-12-15 when my car overheated. I got off the freeway and my husband came to help me. He added anti-freeze and water (about a gallon and a half). My car seemed to be fine so I continued to work. As I was driving, my car completely died. When we got it towed to our mechanic and we checked the oil, all of the anti-freeze and water we added went directly into the crank case? Our mechanic could not explain why this happened. He advised me that it was nothing I did. This is just a freak thing!!!

I am the original owner of this vehicle and planned on driving it for a few more years. This engine should have lasted to at least 175,000 miles. I have religiously had my oil changed every 5,000 miles with the synthetic oil blend. I am so frustrated that this has happened. My mechanic did not want to touch it nor could he find anyone who wanted to fix it. With this engine being so new, no one has had to deal with this. The only place we could find that would fix it is a dealership. We have been quoted anywhere from $4,000 to $7,000 to fix it.

- Cheryl J., Clarkston, MI, US

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