Chuck, having done this last year on my 99' Tahoe I will tell you to check to be sure you have filled the system and purged all the air out of it. Be sure to open the heater wide open (all the way into the red area) to make sure the heater valve is letting water into the heater core..You can park the truck with the nose higher than the rear and that will help purge the system of air also. Sometimes it take a while to get the system completely full of coolant.
No the pump was working when you ran it after the job. It is more likely that when you shut it down the heat in the block produced a hot spot in the cooling system that produced an air lock. Try bleeding the cooling system ( radiator shop will help) and recheck the coolant level at the radiator cap..
SOURCE: heater blows cold air have replaced the thermostat
sounds like the controller went bad use temp checker see what your temp is at inlet of heater core from hose
SOURCE: 1999 Ford Taurus, no heat.
Try checking the two pipes that go into and come out of the heater matrix, is one of them hot? if it is there is an air lock within the matrix, Also is the thermostat opening fully? Sorry i know you said you have changed it twice already but take it out check settings when it should open and close, then boil some water and test the thermostat
SOURCE: I have a 1997 Saturn SL2. I have no heat. We
It is your heater core, there is nothing else left.
The heater housing is usually under the dash, and it must be removed to gain access to the heater core.Procedures for removing a dash, and heater core vary. But for the core:
The heater housing must be removed, and then you
"remove the panels" or "split the case"
(Usually screwed together.)
Remove the coolant hoses, the cable and vacuum control line.
Remove the heater core bracket and clamps.
To install the new heater core, reverse the removal steps.
Core leaks **** because of the core's
location deep within the firewall/ dashboard of the car.
So remember to liquid test your new one before you put it back in, or you could be sorry.
Testimonial: "Thanks for the help. It will really be helpful."
SOURCE: heater blows cold air. I have replaced thermostat,
Not an expert by any means, but i know my ranger.. I had a small leak at the top of my radiator that still cooled the engine but didnt have enough pressure to get to the heater. The heater hoses travel up over the engine and just were not gettin anything to my heater core. That or make sure the heater control valve is operating.
Air
Temperature Control Blend Door Failure No Heat or no AC (dependes on
where door sticks)
In
all modern cars there is a tiny DC electric motor driven gear drive
that moves a plastic door that blends heated and cooled air from the
AC and the heater core, this is called (interestedly enough) the air
temperature control blend door actuator. The motor that moves this
door fails because the door starts sticking from warping, most common
complaint is no heat but it can be no AC as well. To replace these
parts (blend door and blend door actuator) you must remove the entire
dash from the car. Always have this problem confirmed by a dealer or
qualified repair shop as it is a very expensive repair.
Other causes of no heat in the cabin are engine thermostats that are stuck open (engine runs cold) or air bubbles in the cooling system.
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