Having same problem with mine. I am replacing the thermostat tomorrow to see if that works. Put a piece of cardboard in front of the radiator. Drive down the highway a few miles in the cold weather. If heater warms up, replace the thermostat and you should be good to go.
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You may have to replace your heater core . Heater cores are kinda like you outside ac unit and if you stand by it you can feel all the hotter air blowing from it to the cooler atomosphere!!!! So basicly your heater core are alumminum fins that your blower pushes recycled heated motor air through', and into the cab . Maybe the blower is weak . Check your fuses and hoses!!!!
You probably have air in the system. Take off the radiator cap and start the engine. Turn the heater on hot. Let it warm up and fill the radiator as the level drops. Make sure the thermostat opens and coolant is flowing in the radiator. Continue to add coolant until the level stops dropping. Also check for any bleed ports on the hoses or housings where they attach. If you see any bleed ports, crack them open and let any air out. Put the cap back on and see if the heater is working. If this doesn't work, please get back to me.
Try spraying into the latch with a lubricant like WD-40. Also spray a little into the key hole itself. Don't be shy when you do the latch and move the nozzle around to reach different areas in the latch. Hope this helps.
WELL IS YOU COOLANT LEVEL RIGHT AND IF SO WHEN TRUCK IS WARMING UP CHECK THE RAD HOSE'S AND SEE IF THE LOWER ONE IS GETING WARM ARE NOT OR IF THE TOP IS COLD BUT I WOULD START WITH THERMOSTAT IT'S SOUNDE LIKE IT IS COUSE FLOW ISUSSE HOPE THIS HELPS BUT IF BOTH HOSE ARE HOT AND YOU TOUCHE HEATER HOSE ONE HOT THE OTHER IS NOT THEN IT COULD BE HEATER CORE ISUSES
sorry but its not that simple my good fellow!!
you need to get aan auto electrician to sort out where the fault is in the wiring loom!
& then can you will needa new ECU swell so expect a hefty $$$$$ cost due to labour [hourly rate]
& ECU,s are expensive
does the heater core get hot, check the coolant hoses going to the core to see if both are hot, if they are U have a air temperature control blend door problem, most likely the actuator for the door has failed.