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2017 Fiesta Cooling #5132546 06/12/19 06:40 PM
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XanRules Offline OP
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Hi all,

Looking for some recommendations on a coolant additive, if any, for my 2017 Fiesta ST. The car overheated under normal conditions last night and I'd like to avoid that as we move into summer. It was 97F out and I headed up a hill on my way home after sitting in stop and go traffic for about 30 minutes. At the top of the hill, the coolant temp light came on (this does not come on unless the coolant gets to 245F if memory serves) and the car went into limp mode.

My first thought is that, while working on the car this weekend, some air got into the system, so I'm going to try to burp and refill as much as I can this evening. After that, as extra insurance, what would folks recommend as an additive to keep temps down, if any? The Fiesta ST has a notoriously poor cooling system and overheats even under normal conditions are fairly common. I have upgraded the intercooler but am not interested in adding an oil cooler or changing out the radiator on a car with 16,000 miles on the clock.

I have historically had good luck with Redline's "Water Wetter," but have read about this not getting along well with and sludging up modern coolants. The coolant in the car is the factory fill Motorcraft "Orange," which I understand is identical to DexCool.

Any thoughts?

Thanks!

Re: 2017 Fiesta Cooling [Re: XanRules] #5132559 06/12/19 06:55 PM
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JustinH Offline
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It should not be overheating, 97 degrees is not that hot.

Is this a warranty item? Something is not working correctly for sure.

Why was the coolant changed on a 2017 car? Vacuum filled?


'11 Hyundai Sonata GLS
'11 Scion XB
Re: 2017 Fiesta Cooling [Re: XanRules] #5132566 06/12/19 07:00 PM
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E150GT Offline
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I don't think those additives really do much.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 68k 5w30
2006 Buick Lucerne CXL 3.8 40k 5w30
Re: 2017 Fiesta Cooling [Re: XanRules] #5132569 06/12/19 07:05 PM
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gfh77665 Offline
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I have a 2017 Fiesta, too. Your vehicle should definitely still be under warranty.

Re: 2017 Fiesta Cooling [Re: XanRules] #5132571 06/12/19 07:07 PM
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14Accent Offline
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No way it should overheat at 97 degrees, even pulling a grade. Definitely burp the system.

It doesn't surprise me that the Fiesta has an issue with cooling, there's just no room under the hood for airflow.

If I were you, I would look into a software flash that can turn the fans on at a lower temp. It sounds like you heat soaked in traffic, and while going up a hill even with airflow the radiator couldn't remove the excess heat. I doubt it was the grade, itself, that caused it to run hot. It was heat soaked from the previous idle time.

I assume the A/C was blasting the entire time? At close to 100 degrees, I bet the fans are only running 30-40% duty cycle, whereas 50-60% would be better.


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: 2017 Fiesta Cooling [Re: XanRules] #5132576 06/12/19 07:14 PM
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XanRules Offline OP
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I used the A/C while sitting in traffic, yeah, but I'm generally not a "blast the AC" guy.

I agree it's likely an air bubble in the system as we had to move the coolant overflow tank to upgrade the passenger's side motor mount and a line may have gotten pinched/temporarily disconnected when we did so, I'm just looking for extra insurance.

And yes, overheating is a very common issue with the Mk7 Fiesta for that exact reason - no room for airflow plus very tiny factory intercooler and radiator.

Last edited by XanRules; 06/12/19 07:15 PM.
Re: 2017 Fiesta Cooling [Re: XanRules] #5132585 06/12/19 07:30 PM
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14Accent Offline
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Hm. Sounds like you've got your bases covered. I doubt moving the coolant tank made a difference, even if a line came disconnected the bubble would have found it's way back up and out fairly quickly.

The problem with using A/C in traffic is that the fan pulls the hot air through both the condenser and radiator and then it just sits under the hood, mixing with heat from the sump, turbo, cat, etc. The thermal load is just too high.

Looks like all you can do is upgrade, or drive less when it's 80+?


2013 Chevrolet Volt - Saves enough in fuel to pay for itself!

2003 Cadillac Seville STS - The winter "beater", it uses the Volt's fuel
Re: 2017 Fiesta Cooling [Re: XanRules] #5132592 06/12/19 07:37 PM
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XanRules Offline OP
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Yeah, there's an air bleeder valve at the top of the radiator so I'm going to burp it tonight and add coolant if necessary, then check for leaks (I know a lot of the factory fill fluids are underfilled so I might just not have enough coolant).

Good call on the A/C, confirming that my aversion to using it is correct.

Fortunately, I live in Portland where days like this are still pretty rare (though, of course, increasingly common).

Re: 2017 Fiesta Cooling [Re: XanRules] #5132632 06/12/19 08:12 PM
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eljefino Online Content
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Maybe you can get a pusher fan (old benz diesels had them) for in front of the radiator that runs off an aftermarket switch/ relay. As said above, you heat soaked it in traffic.

The air bubble idea holds water, too.

Re: 2017 Fiesta Cooling [Re: gfh77665] #5132664 06/12/19 08:41 PM
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atikovi Offline
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Originally Posted by gfh77665
I have a 2017 Fiesta, too. Your vehicle should definitely still be under warranty.


You do comprehend that warranties don't come with unlimited miles?

Re: 2017 Fiesta Cooling [Re: atikovi] #5132670 06/12/19 08:52 PM
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gfh77665 Offline
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Originally Posted by atikovi
Originally Posted by gfh77665
I have a 2017 Fiesta, too. Your vehicle should definitely still be under warranty.


You do comprehend that warranties don't come with unlimited miles?



Uh, yeah.

Given the fact I have bought two new vehicles in the past two years, yes, I think I have very good knowledge of warranties. Most 2 year old vehicles ARE still under warranty, with a few rare exceptions. Thanks so much.

Re: 2017 Fiesta Cooling [Re: XanRules] #5132747 06/12/19 10:35 PM
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PPWarrior Offline
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Take it to the dealer

Re: 2017 Fiesta Cooling [Re: XanRules] #5132788 06/12/19 11:38 PM
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AC1DD Offline
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Hope you post a follow up.

Re: 2017 Fiesta Cooling [Re: XanRules] #5132794 06/12/19 11:56 PM
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Snagglefoot Offline
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You could install some backwards NACA carbon fibre ducts to pull hot air from under your hood.


www.aprperformance.com. NACA duct Type 2


Last edited by Snagglefoot; 06/13/19 12:18 AM.

If you want the job done right......do it yourself.
Re: 2017 Fiesta Cooling [Re: XanRules] #5132842 06/13/19 02:29 AM
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If it's under warranty still take ti to the dealer and have them check it out.


1975 Ford Capri II Ghia 3000 V6 - Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - Shell Rimula R4X 15W-40 HDEO

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