1988 f150 no heat also temp gauge not working
Did you burp the air from the system after you changed the thermostat? You could have a bad radiator cap, your fans are not coming on when you reach temperature. The passes in the radiator may be clogged and may need to be cored. The outside fins on the radiator are dirty and may need to be flushed with water and soap. Your water pump may not be working....
As far as the gauge you can hook up an external gauge
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