Thermostat stuck open or heater core clogged. Bad radiator cap or small hole in cooling system.
One reason your home electric heater is blowing cold air is the heating elements are burned out. A bad thermostat may also be the problem.
is the blower motor running? or is it just not blowing hot air?
Get a cheap volt-ohm-meter (VOM)at Radio Shack. Learn how to test voltages or ohms.
Sound like your heater core blew out on you
if you got antifreeze on your windshield when you turn the heater on, it's bad
What do you mean by "has no heat"? No air blowing out, blowing out cold air when heater is on, blowing nothing at all? Heater not turning on? What specifically is happening?
Change your thermostat. Mine had the same problem and it was stuck open.
Blower motor, resistor, wiring or control problem are common causes
could be head gasket problem. does your heater work? might need heater core , clogged up. do compression test. or bypass heater core and see if that works.
No one knows if:The heater is NOT blowing - or blowing on high speed only, or... The heater IS blowing, but the air is NOT hotEither way, the "Related Questions" below will get you started
Depends, Is it blowing air at all? If not then could be the fan, fan motor, or an electrical problem possibly with the heater controls. If it is just blowing cold then your going to want to check the heater coil, on that truck I believe it is on the passenger side under dash/floorboard. you may smell anti-freeze if so the heater coil is the problem.