I have a 1995 Ranger XLT with a 3.0 the truck blows hot heat and cold air, but the gauge that controls the heat/cool amount doesn't work. I will have the truck on defrost and no matter it is on medium heat or all the way on cold is blows hottest air possible. I heard this may be due to a vacuum leak does anyone know what may be causing this? Also, AC only works on MAX AC, when turned to regular AC it blows hot air.
Any replies are appreciated