When I first bought this truck 4,5 years back it was overheating, so the first thing I did was remove the thermostat to test for an issue and get me home as I couldn't see a leak, I eventually found the rad fins to to be rotten and replaced it solving the problem but I just remembered that I never reinstalled the thermostat, how much of a difference could this have on FE, I know it will likely be different on short trips but I wonder about longer trips???? anyone know, I will put a new one in when I get back to it but I was just currious if this could be substantial, I don't remember it particularly, running cold but perhaps it wasn't reaching proper temp. which would likely make some difference????
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