Overheating - Fiesta ST ( A/C HOT While Idle)

[STFANS]

Hello All,

Running into Issues with my 2015 Fiesta ST

A/C blows hot at idle ... Cold while driving

Coolant Temps Stay at 187 - 192 while driving

Coolant Temps rise to 240 - 250 at idle (Overheating)

While under the hood looking, it seems like the cooling fan isn't spinning.

I'm assuming that is the issue.

Checked the Fuses none are blown.

 

[redmoe]

Sounds like the fan motor or the fan controller may have died. If the ac cools down again when you are moving that indicates the the heat exchanger is not getting enough air flow to function properly. Obviously the same for engine coolant temps.

 

[M-Sport fan]

Did you have the fan relay replaced?

I know the problem (TSB/recall/whatever) was with/for EARLY '16 builds, but still worth a try.

 

[me32]

You did make sure to have the AC on when checking the fan under the hood?

 

[STFANS]

You did make sure to have the AC on when checking the fan under the hood?

Haha yes I did

 

[STFANS]

Did you have the fan relay replaced?

I know the problem (TSB/recall/whatever) was with/for EARLY '16 builds, but still worth a try.

Checked, wasn’t under warranty sadly

 

[me32]

Haha yes I did

Had to ask. I would check all the fuses and relays. Also the connection to the fan itself

 

[STFANS]

Sounds like the fan motor or the fan controller may have died. If the ac cools down again when you are moving that indicates the the heat exchanger is not getting enough air flow to function properly. Obviously the same for engine coolant temps.

Checked the fan itself, checked all the fuses. Where is the fan controller? Just to make sure im not overlooking it.

 

[STFANS]

Had to ask. I would check all the fuses and relays. Also the connection to the fan itself

Fuses & Relays were good not blown or damaged when I looked

 

[me32]

Fuses & Relays were good not blown or damaged when I looked

Have you tested the fan itself?

 

[redmoe]

I circled the controller in this image:

 

[TyphoonFiST]

Direct power the fan if possible with a lawn and garden battery with alligator leads.