slbenz

Just picked up my 2013 CMax Energi from the dealer. The loud buzzing sound that I heard was the transmission failing. My car was built 3/13 with 95.1K miles on it when the transmission failed. Now I have a new transmission in the car and it drives like new! Transmission replacement covered under factory warranty. Thank goodness or this would have cost me $7200 to replace according to the dealer. :eek:

Actually it is a simple rubber gasket that you fit right over the thermostat. Then you put the two halves together and bolt them closed. Had to use a flat head screwdriver to remove the original rubber gasket. It was very easy to remove and install. Most time consuming step(s) was refilling the coolant to the correct level.

Thanks. Used my smartphone and was hoping the picture will be useful for others in the future.

Nothing special. It is a standard thermostat that I remember from a car I had from the 70's. I did go to O'Reilly but the young man had attitude when I told him the problem. And the price was not much different than the dealer and would have taken longer to arrive.

Went to the dealer this morning. Picked up all the necessary parts to do the thermostat replacement. Based on the diagrams posted here and given to me by the dealer, it was easy to locate the thermostat which is located underneath near the oil filter by the driver's side. After removing the undercarriage cover, it was easy to use an 8mm wrench to remove the two bolts holding the thermostat housing together. Once I was able to remove the old thermostat, I tested it in hot water and found it was defective. The most difficult part of this job was to refill the radiator with coolant back to its normal levels. Attached is a picture of the silver colored thermostat housing in the center of the picture that has the two 8mm bolts holding it together. Thanks to everyone for sharing the diagrams that made it very easy to locate the part. Total time was under 30 minutes to complete the job.

Yes the car overheated again when we let it cool. No check engine light ever came on. Only the engine overheat light.

Checking with my scanner, I did not see any codes come up. I'll talk with the dealer on Monday about this more when the parts come in.

I would agree normally but my 2007 Mazda 5 had a similar issue and the thermostat failed in a closed position.

Went to the dealer today and described the problem and the red engine temperature light coming on. They suspect the same problem with the thermostat. Parts ordered for Monday delivery. Also, when the engine became hot, the limp mode came on to protect the engine, if that helps.

Thanks for the diagram. That is a big help. Looks like it is located on the driver's side behind the radiator. Much different than what I found via Google search saying it is behind the passenger headlight between two belts. Thanks again and I hope to obtain the parts later today.

Hi Everyone, What a way to start my Christmas Day! My 2013 C-Max Energi decided as my family and I were going to grandma's house for Christmas, the engine overheat light comes on. Check the coolant fluids and everything is fine. Suspect the thermostat went out. Anyone know where the thermostat is located and steps necessary to replace it? I have replaced thermostats before in other cars but with having two engines under the hood, can't seem to find it so that I can replace it. Thanks everyone in advance and Merry Christmas.