2014 Ford Fusion Overheat 1.5L

Darren Technician Wisconsin Posted   Latest  
Updated
Driveability
2014 Ford Fusion SE 1.5L (D) 6-spd
Vehicle Overheating

The first thing I checked was the charge cooler inside intake, it looks good.

The customer added some coolant before I got it , full on coolant right now.

The car idles for about 10 to 15 minutes then coolant tank starts to bubble

and message on dash for overheat comes on.

Radiater fans are working. Looking at the coolant tank while idling…..

no coolant circulation is noted, WOW, is that a bad t stat or defective water pump?

The auxiliary coolant pump is humming when actuated with scanner…..

What is my next diagnostic step?

I do not see a data pid for cyl head temp, only coolant sensor which appears to be accurate.

head gasket test with 5 gas shows no head gasket issues.

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Interesting
Obie Technician
Washington
Obie
 

Verify water pump by pulling a heater input hose and idling engine. Should have discharge at idle!!

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Aleksey Mechanic
Russian Federation
Aleksey
 

Dear Darren, Hello! Just to be 100% sure about a gasket. Try cylinder leakage test, and check overflow tank for bubbles.

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Glenn Owner/Technician
Texas
Glenn
 

Hello Darren, As I recall these have a coolant sensor and a head temp sensor. No coolant flow typically points at the main water pump. Also consider that the secondary circulation pump may also have a bad impeller. Ford used plastic impellers that would swell, crack and slip. A thermostat is also recommended. A good FLIR gun would be a plus tracking down issues like this. Only perform a vacuum…

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Darren Technician
Wisconsin
Darren
 

were the plastic impellers on the main water pump or auxiliary? Or both?

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Glenn Owner/Technician
Texas
Glenn
 

Hello Darren, They had them on both, especially the small electric secondary.

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Dave Diagnostician
California
Dave
 

If you have a pulse sensor and a lab scope, I would scope out the cooling system.

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Andrew Technician
United Kingdom
Andrew
 

These suffer hairline fractures in the cylinder liners . Get a borescope down the spark plug holes and inspect

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Agree
Jake Technician
Texas
Jake
 

These come equipped with an electromagnetic clutch on the water pump. Its a “NC” type clutch but I have witnessed failed ”Open” cases many times.

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Darren Technician
Wisconsin
Darren
 

I am glad you brought that up, the water pump looks original and the wiring diagram shows a clutch for it. Does it need to be energized for it to work? If it ohms out ok, do I assume its working ?

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Jake Technician
Texas
Jake
 

The clutch is a ”Normally Closed” design. In other words the clutch is engaged and spinning the impeller at all times UNTIL the coil is energized.

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Darren Technician
Wisconsin
Darren Update
 

My air charge coolant temp sensor stays around 85 degrees f as my coolant sensor climbs to 200 degrees f

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Matthew Diagnostician
Kentucky
Matthew
   

Does the engine overheat while driving i personally would be highly suspicious of the long known issue with these blocks and a revise block for them

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Mark Engineer
Colorado
Mark
 

Darren I’m obviously not paying attention, I read that the engine coolant overheats and there is a message in the cluster to confirm that. However, I now read that your engine coolant temperature is only 200°. I’m confused with this information of 200° coolant temperature but the dash displays an overheat condition.

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Stephen Owner
Florida
Stephen
 

Dear Darren; I watched a NAPA Autotech Training Webinar the other night in which a block design flaw was described that causes blown head gaskets on the Ecoboost variant 1.5, 1.6 and 2.0. A re-designed block with the passage between the cylinders eliminated and a solid surface was substituted. A search for T.S.B.s or a Recall may be a solution that you should explore to best address this. Best…

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Helpful
Darren Technician
Wisconsin
Darren
 

Just at that moment in time it was 200 with the air charge coolant sensor being 85 it hits 245 when dash message appears

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Timothy Owner/Technician
Wisconsin
Timothy
 

The CAC temp usually won't change unless the turbo is active…take the t-stat out and observe whether you've got coolant flow at that point. No flow? Then you know where you're headed. What temp. does it eventually get to? 200 ain't overheat.

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Darren Technician
Wisconsin
Darren
 

It gets to 245. I am definately gonna follow your advice. take tstat out and observe for flow. great advice

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