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you have a bad heater core
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.
Yes, if your low on antifreeze, there may not be enough to fill the heater core, and you wont get any heat. If your heat is not blowing that should be the first thing you check.
There might be a bad fuse causing the heater to not work. Check the fuses if they are all ok you may have a bad blower motor. when you turn the heater on and no air is blowing then it is your blower motor.
If you are saying the heater is blowing out cold air you need to change the heater core which is located inside the dash
bypass valve not opening
Check your coolant. Is it thick and gunky?
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.
my heater fan in front of my 2004 chevy venture van wont work
sell it
you replaced speedo, so try replacing speed sensor
hi i had the same problem and after taking it to the garage they told me my head gasket was on its way out, hope this helps