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Does flushing the heating system clean the heater core. I have everything but no heat. Replaced Heater fuze and thermostat.

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Yes flushing your system will clean out your here core is long as you turn the switches on to activate the heater

Posted on Nov 09, 2014

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2 Answers

Everything seems to work??? still no heat?


dirty heater coil, clean it out so the hot air will travel thru

Dec 18, 2013 | Cars & Trucks

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Heat not working in 2006 mdx acura


The whole system is very simple. There is a valve that opens and closes on one of 2 hoses that come from the engine. If the heater core is not getting water, the valve itself is the problem. If they did the flushing properly they should have checked to see if that valve was fully open to allow the flushing process to clean out the heater core too. If there is sloshing in the heater core (check it by listening under the dashboard when heat is turned on) then there is AIR in the core stopping the antifreeze mix from going through its coils. Remove the heater switch on the heater hose and check it for proper action first. Next have a compressed air test of the heater core to see if it is clogged. If you fix this, try to do regular maintenance on your beautiful MDX!

Jan 12, 2013 | 2006 Acura MDX Touring

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76 COUPE DE VILLE NO HEAT!!! FLUSHED COOLANT SYSTEM REPLACED ANTI-FREEZE, REPLACED THERMOSTAT TO 195 DEGREES, REPLACED A/C THERMO VACUUM SWITCH, HOWEVER FLUID IS CIRCULATING THRU HEATER CORE. THERMOSTAT IS...


Feel the hoses going to heater core, one should be hot and the other warm. If one is cold or both are then heater core is clogged. Make sure heater control valve works and as vacuum to it and or the cable is free.

Jan 16, 2011 | 1976 Cadillac Deville

3 Answers

No heat , replaced radiator , water pump, rad. cap , hoses and flushed system twice.blows cool air.whats left?


Thermostat.? if you haven't? Do it first then try it. While the car is running for a while touch the heater hoses that lead to the firewall. if one is cold and one is hot? You have a blocked Heater core. Follow the hoses back to the engine. Unconnect them both. By using a garden hose flush out the heater core do one side and then reverse by doing the other hose Lots of junk will come out so be care ful. Mistake people make is "Flushing the system" That doesn't mean your flushing the heater core.
Seeing that you have done everything else it could be the thermostat which you didn't list or the heater core being clogged. When you finished installing the thermostat and flushing the heater core out. Replenish the coolant system . If you have a bleeder on the thermostat housing? use it . loosen it and top off the fluid until you see fluid comeout of the bleeder. The system being air bound would cause no heat..

Jan 10, 2011 | 2000 Buick LeSabre

2 Answers

Heater core problems no heat changed thermostat still no heat any ideas


try flushing cooling system could be a blocked heater core.if flushing doesnt work remove and replace heatercore.

Nov 26, 2010 | 2002 Ford Taurus

3 Answers

99 jeep cherokee problem w/ heat I replaced the blower motor, water pump,radiator, thermostat and flushed the coolent system. Still getting little heat. I'm thinking heater core or head gasket... Is there...


It sounds like the heater coil needs flushing out or replacing or the heater valve. Look on the engine firewall and make sure the heater valve is opening. If not open it manually and check the heat level. If that produced heat check the condition of the heater vale cable (or vaccum hose).

Jan 05, 2010 | 1999 Jeep Cherokee 4WD

2 Answers

1999 Taurus-NO HEAT-replaced thermostat,flushed heater core,still NO HEAT,ANY SUGGESTIONS?


Sounds like the problem has to be the valve is not opening and thus not allowing the hot coolant to enter the heater coil. Manualy open the valve (engine firewall) and see if heat is present. If this works check your cable from the dash switch as it isn't working the valve properly and needs replacing.

Dec 29, 2009 | 1999 Ford Taurus

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2001 F250 super duty 5.4 has very little heat. changed thermostat, checked blend door and other diverter doors. all are working. blew the dust from the heater core. still the air is luke warm. anyone have...


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.

Dec 29, 2009 | 2000 Ford F250 Super Duty Crew Cabs

1 Answer

Heater not working (no heat)


If u have issues with heatting may be this will help.

1- If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.Remove it and install a new unit (most radiator shops will not repair a leaking heater core.

1 - If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
  • If flushing fails to remove the blockage from the heater core, the coremust replaced.

Nov 19, 2009 | 2003 Ford F250 Super Duty Crew Cab

2 Answers

Car will only have sometimes and i have replaced


If the car is not providing heat and thermostat is good, then your problem is a faulty heater core. Sometimes when heat cores wear out, they sometimes give off an anti-freeze smell.
You can go to autozone.com and register for full free online repair manual with everything you could need for your car.

Nov 15, 2009 | 1996 Ford Explorer

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