does a 1977 f150 have to have a thermostat in it.. we have replace that the radiator the water pump and its still running hot.. it didnt run hot till we put the thermostat in it..
Yes. It must have a thermostat. Otherwise it will cause problems from not warming up to the other extreme of overheating because the coolant will run too fast through radiator and not have time to dissipate heat.
Make sure you have the thermostat in properly and the stat has what they call a jiggle pin in it, this helps getting rid of air pockets.
Don't hate me for this guy's but I've seen the same truck run without one just it never warms up. Yes it's not good for it, builds up sludge, blah blah blah... to run no thermostat is essentially a band aid. You would need to fix the real issue, but will it run. Yes it will. If you drive this thing daily I don't recommend it long term
I had a 77 truck, and believe me you would never get by running without a thermostat, it really gave new meaning to the phrase "cold blooded ford" the only time of year that you didn't have to let it warm up before driving it was mid summer. But if you don't mind popping back through the carb, stumble on take off, and zero heat from the heater when you need it and severely icing of the carb when cold damp weather hits then your fine.
We would never hate you Andrew. I took the 'stat out of my '76 (390) and it went from not getting up to temp forever but when it did it kept climbing to overheated. It's my assumption that the reason is the coolant didn't stay in the radiator long enough.
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