Back flush heater core itself. Burp system.
If both heater hoses are hot but only warm air is produced it is unlikely an airlock is the problem and almost certain the cooling system flush has not been effective.
In that case ideally the heater matrix should be replaced or dismantled and cleaned but it is possible a different type of flushing would be more effective.
It is a kill or cure method but an air and water flush can reach the parts other types of flush can't reach. The heater is disconnected and water run through it until full and then compressed air is blown into it which causes a violent reaction and everyone gets wet. The process is repeated several times in each direction.
It is very possible that there is air in the Heater hoses and it needs to be "Burped". With the engine COLD, remove the radiator cap and locate the Heater core hoses (there will be 2 hoses close together - In and a out). It is also possible the thermostat could be installed backwards.
SOURCE: 2002 jeep liberty has very
sounds like a head gasket problem. A minor leak there will pump compression into coolant and force it out of heater core. Any unusual steaming from tail pipe? Also: if radiator was flushed "in car" sometimes debris does not come out. Try flushing with it out of the vehicle. Jeep radiators are notoriously small for their application if not at at least 90% they will not work correctly.I'd look at the hg first though otherwise, your symptoms seem to be contradictory.
SOURCE: 99 VW Beetle blows warm air when you start air conditioner
your condensor fins could be blocked by leaves or other debris on the outside. this component is located right behind the radiator. there could also be an overcharge or under charge in the system. make sure that when you charged the system that you used a good set of gauges to check the system pressures. Also check and make sure that there is not a blockage somewhere in the lines, Usually if there is there is a fine layer of ice surrounding it.
SOURCE: 2000 VW Beetle air conditioner stopped working
FUSES ON TOP OF BATTERY.FUSES AT THE LEFT END UNDER THE DASH OF THE INSTRUMENT PANEL.LOOK FOR BLOWN 30 AMP FUSES.
Testimonial: "Found the fuses! There are 3 on top of the battery and I cannot get the one out! Suggestions? Thanks!"
SOURCE: 2001 FORD EXPEDITION XLT 4.6L V8 BLOWING MILD WARM
You hot air comes from the water circulated through the heater core. It is like a miniture radiator with water flowing thru it constantly. So by opening the "Blend Door" you are permitting so much of this hot air to pass thru.
Seems like for some reason your heater core is plugged up. Just like a radiator can be. So water may be passing through your heater core but not passing through fully. Your heater core gets hot from water passing throught it from the engine. Then your doors open up, in proportion to how much air is permitted to pass over the heater core.
Suggest to remove the heater core and replace it. Seems the blend doors are working properly but again, if you have a non working heater core then no air can pass over the "Hot Core" for you to recieve hot air.
If you are not mechanically inclined, then go to a local parts store and you can buy a car manual, such as Chilton's or Hane's Car manuals, for your year and make to show you how to replace it. Then you can also have it for any other problems that may arise.
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possibly air in the system. run the car with the radiator cap off and keep it full allowing all bubbles to come out. look around for any bleed ports in the cooling lines or the thermostat housing and open them with engine running to release air.
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