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2006 pilot no heat. opened water control valve manually, still no water reaches heater core ,front heat

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You need to check the fluid level. Bleed the the air out. All you need to do is add fluid to your radiator and it around for like a few miles and add more. If the inlet and outlet hoses are not hot then I'd check your water pump. If your inlet hose is hot but your out let is cold then it's your heater core. Clogged or not working.

Posted on Dec 08, 2016


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2 Answers

Put in new thermostat heat is not blowing out like it should what can it be

So there are two systems to consider here. First you have the heated water that would supply the heat for your heater. Water circulates from the engine (hot) through the cooling system (water pump, hoses) regulated by the thermostat and to the radiator to be cooled off. Once the car is warmed up, both heather hoses should feel very hot. If one is real hot and one is luke warm, the water/coolant mixture is not flowing though the heater core. Some heater cores have valves called heater control valves. If the value is closed or stuck, then this could be the fault. If there is no control valve or there is flow after the valve, then the heater core itself is plugged. It is like a small radiator and the area for the water to flow is very small, so they do plug over time.

The other system to consider is simply the ducts in your dash board. When you select cold a flag will close off air flow to your heater core. You should feel resistance with manual levers since they are moving mechanical flaps. Over time the plastic pieces may become brittle. Other valves can be vacuum assisted. If all that ever works is the defroster and you can never get hot air out of the vents, you most likely have a vacuum leak. I always check the small vacuum supply line coming off of the firewall first.

So to recap, check both heater hoses. If they are both equally very hot, water is flowing and you will want to move on to the under dash linkage to see if the door is closed to the hot air supply.

Mar 05, 2014 | 2000 Kia Sportage

1 Answer

Poor heat in opel zafira 2006

You can try flushing the heater core by disconnecting both water hoses goin in from the engine bay. Stick a water hose on any of them to see how it comes out on the other side. Ive had this problem before and 99% of times is a clogged heater core. Also check heater control valve, sometimes the get stucked and not let water go into the core. I hope this helps!

Mar 26, 2013 | 2006 Opel Zafira 1.6

1 Answer

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

1 Answer

1995 jeep cherokee heater problems

Get jeep up to operating temp
Turn on heater to max heat
Hood feel 2 heater core hoses goint into upper passenger side of engine compartment firewall.
They should feel too hot to hold
If it's not hot, could be 6 things
1. heater control valve is bad
2. Vacuum to heater control valve is bad
3. clogged heater core.
4. Bad thermostat
5. Bad waterpump
6. Needs more coolant (check when system is cold)

Do these things:

1. Disconnect vacuum line from control valve and feel under valve to manually move valve to open position. This should let hot water flow through core. If you now have heat inside, replace the heater control valve. Or you can disconnect the plunger on the heater control that is hooked on to the silver bar on the bottom of it. With it disconnected you can manually move it to the open position. It will always remain on.

2. When system is cold, disconnect both heater hoses going to heater core. hook up a water hose to one side of heater core and flush out any gunk. When you get done, the water should run clear. If you see lots of gunk come out, that was probably the problem. Replacement is like $20-30

3. When system is hot and engine running, squeeze the upper radiator hose (using gloves) when you release it you should feel a surge of water. Proves your water pump is working. If no surge, check thermostat. If thermostat checks good, look at the weep holes at the bottom of the water pump for traces of antifreeze. If you see a trace or stream of coolant, indicates bad pump.

4. As far as testing the thermostat, watch as your engine heats up on the gauge. when it gets to a certain point you will see the temperature rise, then lower, then rise again. This means your thermostat opened properly, cooling the system temporarily, then heated it back up. Replacement is around $5

Try these and see how it goes.

Feb 01, 2012 | 1995 Jeep Cherokee

2 Answers

Not blowing hot air until l reach 60 mi. per. hr. , temp. 190% , thermometer control seems to be working switches to leaks at water pump weep hole no wobble in pump pulley ? thought...

your heater core is probably partialy plugged try disconecting both hoses .place a short peice on the connections pour in some c.l.r. and let stand for a couple of minutes flush with water botom to top hosewil probably foam alot so wear protection c.l.r. is an acid may have to do this a couple of times replace heater hoses and test.

Feb 28, 2011 | 1999 Dodge Ram

1 Answer

I just had a new thermostat put in my 2005 pilot because only cold air seemed to be blowing - lukewarm at best. They also fluched and put in new anti freeze. It seems better but not great. Now my center...

Had the same problem on a 2006 pilot LX. Hot from rear heater because it comes from a separate heater core. Front heat low because ball valve faulty that controls coolant flow to heater core. The lever on the valve would move freely but the connection to the shaft of the ball valve was stripped. Ball valve may be located on the firewall under the hood. Ball valve very poor design.

Dec 02, 2010 | 2005 Honda Pilot

1 Answer

2002 Stype no heat changed heater core an D.C.T code

Sounds like you have an Air bubble in the new core stopping the flow from the radiator or the control valve on the supply line is not opening. Check the Control valve on the upper 1" line that runs from the motor to the firewall and heater core area. If that is not opening no heated water is reaching the core. If this is vacuum controlled, most are in the newer vehicles, and it functions manually then start checking your vacuum lines for leaks.

Oct 28, 2010 | 2003 Jaguar X-Type

1 Answer

Engine reaches running temp but no heat in van . have back flushed heater rad and cleaned matric , changed thermostat etc still no heat

You should have 2 water lines coming out of the heater. Without burning yourself, check the 2 lines with your hand while the engine is running. If both lines are hot you have flow through the heater core. This would be good. The lack of heat would be a vent door in the ductwork is not opening.

If only 1 line is hot you either have a control valve that is not opening because of a bad control cable or bad vacuum switch. If the control cables and vacuum switch work, the last bad thing would be that the heater core is plugged.

Jan 26, 2010 | 1998 Ford Escort

3 Answers

Can not find heater control valve 2000 expedition

what year? for 2000, there are no control valves. It mixes a/c air with heater core air to blend the right temp.

SECTION 412-02: Heating and Ventilation 2000 Expedition/Navigator Workshop Manual
DESCRIPTION AND OPERATION Heating/Defrosting The heating and defrosting system has the following features:
  • Controls the temperature and, during A/C operation, reduces the relative humidity of the air inside the vehicle.
  • Delivers heated or cooled air to maintain the vehicle interior temperature and comfort level.
  • Controls the A/C blower motor speed.
  • Cooling or heating can be adjusted to maintain the desired temperature.
  • Uses a reheat method to provide conditioned air to the passenger compartment.
  • The blower motor draws outside air through the A/C recirculating air duct, except for MAX A/C cooling, when recirculated air is used.
  • All airflow from the blower motor passes through the A/C evaporator core.
  • The temperature is then regulated by reheating a portion of the air and blending it with the remaining cool air to the desired temperature.
  • The temperature blending is controlled by the temperature blend door, which regulates the amount of air that flows through and around the heater core, where it is then mixed and distributed.

Dec 01, 2009 | Ford Expedition Cars & Trucks

1 Answer

No heat, heater core is good,blower moter works

Check the operation of the heater control valve. If it doesn't open up no heat. If the cable moves the control on the valve take the valve off and check it manually. The lever may work but the valve still doesn't open.

Sep 30, 2009 | 2002 Mitsubishi Galant

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