now a diesel head..
AO Silver Member
Join Date: Sep 2014
Location: United Kingdom
I doubt its the stat for two reasons...
1) they fail open resulting in the car running at a cooler temperature on long runs..
2) engine replacement done , which implies whatever the underlying problem was before the engine was switched still persists.
did they use the same ancillaries? because the favorite for this would be water pump..followed by cooling fan temp switch, I suspect this strongly as it would likely not have been replaced with the new engine, either that or a short or wiring issue to it...then its the rad as the next likely culprit ,either blocked or leaking.
it surprises me how often gargages will replace an engine without diagnosing the reasons as to wy the first one failed, I have seen at least 2 mulitple engine failures because of this, usuallly to do with silly things like the aforementioned or a leaking coolant system which won't pressurise and therefore results in the coolant kettling way before operating temp is reached.
as you can see though these engines are prone to HG failure at higher mileages, this is more common on the CF3 versions as the extra emissions related stuff in the mani creates more back pressure and heat and the result is a HG breach on the rear bank, even more common still on the 3.2 V6 ...I haveyet to meet a GT with a 3.2 in it that hasn;t required a top end rebuild ,some as early as 50k ,although its more common and 100k+ mileage.
I hope its not HG for you but it is a possibility.
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