Picked up my 2015 FiST back in 2019 and I’m just now hitting 80k miles.
For a while now I’ve had an intermittent issue where the car will start overheating in very hot weather, especially at idle or low speeds. Occasionally it’ll also almost stall when coming to a stop in hot weather. Once moving again, temps usually come back down.
I’ve spent a ton of time digging through forums and Reddit and this is the list of parts I’m considering replacing:
●Koyo radiator
●Whoosh radiator hoses
●Motorcraft radiator fan assembly
●Whoosh V3 intercooler + hoses
●180° thermostat + seal
●Serpentine belt
●Belt tensioner
●Throttle body + seal
●EVAP harness
At this point I’m trying to figure out whether:
These are reasonable preventative replacements at 80k, or
I’m just throwing parts at the problem unnecessarily.
Has anyone dealt with similar symptoms on a FiST? Anything specific I should diagnose/check before replacing all of this?