Heater and thermostat

ford
f150

#1

my f150’s heater wasnt working while on a trip to mexico. it wouldnt heat while driving sixty and over,and the tempeture gauge would drop to zero… I changed the thermostat and ther temprature sensor… And while the truck was standing still while running, the heater and motor temperature gauge would work fine.


#2

I’m lost. What’s the question? Is it still getting too cold even with the new thermostat? Did you replace with the correct OEM temperature thermostat?