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Can you hear the blend door moving when you change the temp from cold to hot or vice versa? If not, then you need new blend door actuator. Also check the heater core for any blockage. (2 ways to tell....run the car til normal temp, and turn on the heat and feel the hoses by the firewall...if one is hotter than other, there is a blockage inside the heater core. Or disconnect both hoses at firewall, and put garden hose in one of those 2 open tubes and turn on the water...good flow or weak flow coming out of heater core tube? Weak flow means blockage) If there is a blockage, time to get new one.
It blows cold air with the mode selector in what position. If it is on defrost and you have the temp adjusted to full heat than the a/c will be on to dry the air before it hits the windshield, this helps to remove the fog from the windows. If there is no heat coming out the vents than you need to check to make sure the blend door is working. You should hear a distinctly different sound out the vents when you turn the heat from full cold to full hot. Also check to see if the heater core is plugged. With the engine warm you should be able to feel little difference in the temp of the two hoses that go to the heater core. If one is hot and one is cool than there is a flow issue. Either the water control valve is bad, it is not being opened by the HVAC control head, the is a vacuum leak to the control valve or the heater core is plugged. Your vehicle may or may not have a valve that controls the flow of hot water to the heater core.
Could be several things. First, when car is fully warmed up, open hood and feel your two heater hoses coming out of firewall. Make sure your heater control is on hot, both hoses should feel hot. If only one is hot, your heater core inside heater case is either restricting flow (clogged) or an air pocket is restricting flow in your coolant(need to "burp" system-get all the air out of your cooling system) . If heater core is good, and circulating good, then you may have a temp. control door that is inoperative under dash, and not allowing air to move over your heater core. Good luck.
Look for a sticking heater control head. There is a cable that runs from the lever you are moving to a valve that controls the coolant flow into the heater core. Take it to you local Honda dealer for repair.
You could try flushing the
heater core incase it has a clog or an air pocket but before you spend money
and flush or replace anything, do a little diagnosis before you do a bunch of
work you don't need. It saddens me to see how many people just will not try to
figure out what is the actual cause and will just start replacing things.
Have someone move the temp from hot to cold while
you look at the heat control valve that is near the firewall. You should see
the thing move. If it doesn't move, figure out why. Either there is no vacuum
to make it move or the valve is shot.
Second, while in hot, feel the heater hoses and
see if they are both about the same temp. If they are, then no flushing is
needed. You have flow through the core. If one hose is hot and the other cold,
or much cooler, that doesn't mean you have a plugged core yet. Remove and
inspect the heater control valve to see that the little door inside is actually
moving when the arm moves. If it is, then BACK FLUSH the heater core with a
garden hose, then use a chemical flush kit on the entire cooling system.
If you have flow through the core, then the
problem is in the mix door or mix door controls.
These tests are done while running, with the
blower on full. Let me know what you find.
Make 100% sure before you go and spend more $$$ that (1) you have good coolant flow through the heater core; get engine to operating temp,then with heater fan on high and temp control on full hot carefully grasp heater in and out hoses(i use a in-fared heat gun to diagnose). They should be very close to same temp, if not, core is plugged or if equipped with a flow control valve, its not opening or there is an air lock in system.(2) If coolant flow is good, suspect the hot/cold blend door being stuck in cold position assuming you have good air flow. Its very rare for engine cooling to be ok and heater core coolant flow be bad , caused by a failed water pump! Hope this helps! Please rate me,Thanks!
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case. if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.
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