The best way to clean out a heater core of gunk on a dodge neon is unhook the heater core lines from the fire wall after draining all the old coolant and then run a water hose to the heater core, do the top line first and then do the botom one after about a min. while the coolant is out replace the thermoustat.
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have 2002 altima,blower works no heat at idle and very little heat when accelerating.I changed carbon cabin filter,made sure little gear under dash to temp knob wasnt broken,flushed and bled system.Nothing worked so checked hoses to heater core and found inlet hose was hot,outlet hose was not.So investigated this problem and came to conclusion heater core was clogged.An easy way to check is to get car to normal running temp. put on heater and blowers at full.Go under dash on passenger side where counsel meets firewall,this is where heater core core inlet and outlet aluminum tubbing go through firewall,you will be able to feel both tubes one closest to you is outlet, so if this one is not hot and and other is your heater core is clogged.I detached both inlet and outlet hoses to heater core from water control valve.Then I blasted water with waterhose and nozzle set at jet,first through outlet hose to blow gunk out,then through inlet hose until water runs clear.Reatach hoses fill and bled system.heater works great nice and hot!
try flushing the heater core. i had the same problem with my '01. disconnect the 2 heater lines, one on the manifold and one on the water pump. use a garden hose and run water through the core in both directions. use almost full pressure on the garden hose to force the gunk out of the heater core. may also want to use a cooling system cleaning agent to help with the removal of water scale etc.
Flushing the radiator should actually cause your motor to run cooler, because the flushing process removes built up gunk and rust that plugs them. If you are talkin about getting more warmth to the interior of you pick up through the heater. there are a couple things you can do. replace the engine thermostat with a little bit higher temp. or you can try to backflush the heater core itself. if you are not getting the heat through your heater the best bet is the heater core is pluged, this is very common to have happen. Hope this helped you out. Thanks Aaron
Take the heater core hoses off at the firewall and add cleaner/flush directly to the core. Run water through and get the gunk out. Ford has a WYE piping system that will bypass the heater core and not allow it to FLUSH and it will get plugged. The other thing to check is the BLEND DOOR and it is operated by a little motor which you can observe if you have the panel where the radio/heater controls are off. It swings from heat side to a/c side (and in between)as the colors on the knob are rotated. Watch the operation and hope the door has not come off inside the box or the cable.
is sounds like the heater core is clogged up. you can remove the heater hoses, not from the heater core ( the core fittings can be delicate) but from the other ends on the engine and flush it backwards( colder hose) to blow the gunk out, use low pressure air or low pressure water.
There is a potential downside to this, the gunk may be plugging up a leak. take out the gunk and you might have a leak. Also if you over pressurize you may spring a leak. But on the otherhand if you were going to replace the heater core any ways you got nothing to lose. By the way if you do damage the heater core just loop one of the hoses back to the engine fitting. this will keep you on the road until a proper repair can be made. watch out for gunk spraying out of the hose or wear a raincoat and goggles!
Either the coolant is not flowing through the heater core, or the gunk build up inside the heater core has reduced its heat transfer to next to nothing.
If the heater hoses are both warm when the car is warmed up then you have circulation through the core. If one is cold and the other warm, you have a blockage. My **** way to clean a core is to disconnect both heater hoses from the core, they are behind the engine in the firewall. Then I blast water from a garden hose first through one pipe and then the other, back and forth a few times with a good strong flow. Obviously water will come out the open pipe so be ready for that. Sometimes this work, sometimes not, sometimes it blows a hole in the weak area of the core and you have to remove your carpet and get it cleaned after you replace the core.
You should have a heater control valve in one of the heater hoses. Check that when you set the controls all the way up hot that the valve is opening the whole way to allow hot coolant to run thru the heater core. If the valve is working and allows flow, you may have to take it out to check it. Then the problem will be the heater core is most likely clogged and needs cleaned out or replaced.