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Old 22 Dec 2010, 02:31 pm
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Default WHY DOES THE HEAT NOT WORK IN MY 2000 HONDA ACCORD?

THE CAR HAS ANTI-FREEZE IN IT AND THE HEAT STILL DOESN'T WORK. WHEN I TURN THE TEMP KNOB TO COLD AND THEN BACK TO HOT IT BEGINS TO WORK BUT DOESNT GET EXTREMELY HOT LIKE IT USE TO.
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Old 22 Dec 2010, 02:46 pm
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bad thermostat is probably the cause...































could also be bad heater control valve...































bad heater hoses....































clogged heater core....































bad gasket on heater door....or bad vacuum pump for door...































bad heater door.....
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Old 22 Dec 2010, 03:01 pm
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If it's suddenly changed in how the heat works that means that you have to check the level, quality, and mixture of the coolant and test it with a anti-freeze tester.The whole engine, rad , heater-core hoses, water pump, coolant lines need to be checked for any possible leaks or parts then require changing.If there's any odd odours or if any gunk that almost looks like grease is building up on the interior windshield with the heat on full and with the engine fully warmed up.















I'd be double checking the coolant level and testing the coolant being sure that it's mixed 50/50 and that it's good for a good -40c, then I'd want to make sure that the thermostat is working properly.One way you can do this is to squeeze the thermostat hose when the engine is cold started and with the blower and heat off, after a few mins the engine should warm up , keep an eye of the temperature gauge's reading when it's cold starter and how much it moves once fully warmed up.The hose should force your hand to open unless it's a special type of hose that you may not be able to squeeze , if so then try feeling the heater-core hoses at least one of them should be getting hot.































Once you know that the thermostat hose is working due to the hose pressure or the heater-core hose , try having the engine warmed up fully and turning the blower motor/heat on full and touch the heater-core hoses check to see if both are fairly equally hot.If neither hose did get hot that tell you that the thermostat isn't opening and that it requires replacing.































Sometimes the rad will rust or corrode or clog internally and the rad or coolant system might require flushing/replacement.If you do change the rad it's best to at least flush and change the coolant but I'd stronly recommend hat the thermostat and any weak or old hoses are replaced at the same time.Plus if it's a 2000 it more then likely could use a new thermostat and that's when you really should change the coolant unless the coolant was replaced recently.































Also once I knew that the coolant system had the proper levels/quality/mixture is all okay and that perhaps both the heater-core hoses might be getting hot but still not enough heat I'd remove either the rad/over flow cap with the engine cold and then let it run stand back watch the temperature gauge and the coolant should start to over flow forcing the air out of the system.Shut it off then allow cooling time and then top the coolant off a few times and recap it, start it up allow it to warm up and try the heat again.































If you know no odd scents exist or gunk on the windshield, plus the heater-core hoses are hot and system was air beld but still no proper heat levels, be sure that the vents are working fully , and that all the blower motor levels are okay.Then you should try bleeding the heater-core or flushing it with a full coolant system flush or try switching the two hoses around , allow it to warm up awhile running idling, then shut it off , allow it to cool down and switch the hoses back around and top it off again , then try starting it and allow time for it to fully warm up and try the heat again.































































Hope that helps and best of luck.By the way if you do lots of driving and tend to keep that vehicle awhile and none of the hoses or rad or coolant system fluids where changed in some time I'd highly recommend that you look over that whole vehicle and perhaps change the hoses and rad maybe even with a U Pull auto wreckers used rad, new rad hoses/clamps.































There should be quite a few Honda parts stores and some that specialize in Honda parts that will have fairly good prices on their parts but for sure either way wrecking yards or parts stores all have lots of accessible parts for that vehicle.
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