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Re: 2017 Fiesta Cooling [Re: XanRules] #5132863 06/13/19 05:29 AM
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Miller88 Offline
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Is the electric fan not working?


18 Forester 2.5I 6M
00 Jeep XJ
01 F-350 4x4 5M
Re: 2017 Fiesta Cooling [Re: XanRules] #5132923 06/13/19 07:13 AM
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SubieRubyRoo Offline
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An old, cheap trick to get hot air out from under the hood is to unbolt the rear of the hood and stick a couple washers between the hood and the hinges, just enough to open a small air gap. At speed, the airflow will push out the hot air.

But I agree. Should not be having overheating problems being only 2 years old and 97 degrees. Maybe use header wrap and turbo blanket on the exhaust to cut down on underhood temps? It would help turbo spool as well.

Re: 2017 Fiesta Cooling [Re: XanRules] #5133043 06/13/19 09:39 AM
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fenixguy Offline
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A friend of mine has one of the three cylinder Fiestas and just had to have the engine rebuilt because the plastic fins on the water pump disintegrated and caused the engine to overheat and warp the head. He bought the extended warranty from Ford and they (of course) denied the claim. He just had to spend thousands of dollars on a car he still owes money on with less than 50,000 miles. Actually, that car has been at Ford about once every few months for some kind of repair.

I'd get rid of that thing as soon as possible and buy a cheap used Civic or Corolla. You should not have to be modifying a new car to make it usable.

Last edited by fenixguy; 06/13/19 09:40 AM.

'16 Frontier SV 4x4-PP/Nissan OEM
'08 CR-V EX AWD-Valvoline Syn MaxLife/Fram TG
'01 Civic EX-Valvoline Syn MaxLife/Fram UG
'00 Civic LX-PYB/Fram UG
Re: 2017 Fiesta Cooling [Re: XanRules] #5133087 06/13/19 10:56 AM
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Env1ous Offline
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See if they have a stant super stat for the fiesta. I have a 13 f150 eco and on stock thermostat I would sit at 205-210 idling and driving. With what we have seen the super stat flows more coolant and opens more consistently at 188 temp. The OEM tstat is 188 as well. With the stant crusing and idling im at 193 and it seems to cool down a lot quicker as well.

Re: 2017 Fiesta Cooling [Re: XanRules] #5133172 06/13/19 12:40 PM
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nthach Offline
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No WaterWetter with modern OAT coolants. Since you did some potential cooling system work, I would try getting the air out of the cooling system. Seeing that you have a Fiesta ST, you have a turbo to cool down as well.

I'd see if Ford fitted any bleed screws on the engine. Park the car on a slope, nose up or jack it up and open the surge tank cap and let the car run until you have strong heat, fans cycle and no temp warning lights are on. If you have an air compressor, one of these is a good investment to have - it evacuates your cooling system and the vacuum formed will suck in coolant to fill it back up: https://www.amazon.com/UView-550000-Airlift-Cooling-Checker/dp/B0002SRH5G

Re: 2017 Fiesta Cooling [Re: XanRules] #5133198 06/13/19 01:13 PM
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JTK Offline
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It really doesn't sound like the system needs to be bled if it functions perfectly in all conditions other than heavy stop and go, followed by a long, high load hill climb.

Sounds like a fan or grille/airflow deficiency with this model.

OP probably did this, but I'd be sure to put the cabin heat on full blast under these conditions until you tire of the car.

Last edited by JTK; 06/13/19 01:13 PM.

2017 Ram 1500 4x4, 3.6L.
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Re: 2017 Fiesta Cooling [Re: XanRules] #5133286 06/13/19 03:10 PM
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XanRules Offline OP
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There was TONS of air in the system. Not sure how as no coolant lines were disconnected when we were working on the car, but I added probably a quart of coolant yesterday. No visible leaks but will be keeping a vigilant eye out just in case.

Ford has a reputation for under-filling the fluids on these cars so the fact that the coolant was low doesn't surprise me - a number of owners have reported on other forums that their coolant was up to 1" below "minimum" on a cold engine from the factory.

Re: 2017 Fiesta Cooling [Re: 14Accent] #5133304 06/13/19 03:33 PM
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dailydriver Offline
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Originally Posted by 14Accent
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.


The tuners for these cars can set the fan speeds for a much lower temp turn-on, as YES the factory (guessing for emisssions/CAFE mileage reasons) sets them at WAY TOO HIGH a temp, and then at even MORE ridiculous duty cycle percentages than even mentioned above.

The problem is that Ford WILL not honor a power train item warranty if they detect a tune has been written into the ECM, which they can tell by the draconian re-flash 'counter' feature of their ECMs. frown

Ironically, a much higher capacity aftermarket radiator (of which there are currently 3 to fit these cars) will also enable Ford to try and weasel out of said warranty, even though one is HELPING the head/head gasket/engine's longevity by doing so. mad


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: 2017 Fiesta Cooling [Re: Snagglefoot] #5133308 06/13/19 03:36 PM
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dailydriver Offline
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Originally Posted by Snagglefoot
You could install some backwards NACA carbon fibre ducts to pull hot air from under your hood.


www.aprperformance.com. NACA duct Type 2



Some who open track these cars install hood vents in the furthest back corners of the hood, just like the WRC cars have. wink


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: 2017 Fiesta Cooling [Re: Miller88] #5133309 06/13/19 03:38 PM
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dailydriver Offline
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Originally Posted by Miller88
Is the electric fan not working?


There WAS a fan rely recall/TSB on certain build dates for these cars, not sure if the op's falls under that or not. shrug


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: 2017 Fiesta Cooling [Re: XanRules] #5133337 06/13/19 04:08 PM
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XanRules Offline OP
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The WRC-style vents are nice and a number of people have proven that they are functional, though the best price I've found for them is about $290, not including shipping from the UK.

The fan relay/recall TSB only extends to the 2015, I believe they fixed that issue along with the revisions made to the emissions/evap system in 2016.

Last edited by XanRules; 06/13/19 04:08 PM.
Re: 2017 Fiesta Cooling [Re: XanRules] #5133339 06/13/19 04:09 PM
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XanRules Offline OP
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As a side note, dailydriver, how do you like the Ravenol MTF-2 in the transaxle? I'm torn between that and the BG Synchro-shift II.

Re: 2017 Fiesta Cooling [Re: XanRules] #5135059 06/15/19 03:50 PM
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dailydriver Offline
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Originally Posted by XanRules
As a side note, dailydriver, how do you like the Ravenol MTF-2 in the transaxle? I'm torn between that and the BG Synchro-shift II.


It is FINE, and just as silky smooth as all of it's boosters/promoters on the ST forums (I am M-Sport fan on there, if you did not deduce that already!) claim it is. wink thumbsup
That being said, I may try the BG product on the next change.


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: 2017 Fiesta Cooling [Re: XanRules] #5135062 06/15/19 03:53 PM
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dailydriver Offline
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Originally Posted by XanRules
The WRC-style vents are nice and a number of people have proven that they are functional, though the best price I've found for them is about $290, not including shipping from the UK.


IF I ever decide to do hood vents, I would just get the (yup, BIG $$$$) carbon/kevlar Mk7 actual WRC car, whole hood, instead of cutting up my facory steel hood. wink


2016 Ford Fiesta ST 17K miles
Ravenol REP 5W-30
Fram XG3600 filter
Ravenol MTF-2 in the IB6 transaxle
Re: 2017 Fiesta Cooling [Re: dailydriver] #5137780 06/18/19 06:39 PM
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XanRules Offline OP
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Well, since burping the system, the problem hasn't come back, though it's also been much cooler this week. I'll keep an eye on it. It is interesting how low the fill of fluids is on these cars.

dailydriver - same name on those forums for me! The Ravenol is a lot cheaper than the BG but I'm on the fence.

I'm insane so cutting up my own hood seems fine. I'd hire professionals to do it, of course.

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