Question about 2003 Dodge Durango

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NO HEAT THE CORE IS NOT PLUGED UP WITH ANY JUNK JUST NOT CIRCULATING

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Make sure your coolant level is correct - turn the engine on, turn the defrost, heat, and blower on high, open the coolant cap and rev the engine up for a little bit. Do this at a cold start. Check the level while doing this and make sure it is full. Another possibility is the blend doors are not functioning properly. Make sure the actuators are not binding up that control the blending.

Posted on Mar 15, 2011

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1 Answer

How can i troubleshoot my heater core


It's just a simple small radiator. Coolant circulates through it, and the cores' fins give off heat that is picked up by the blower motor.
When the engine is at normal operating temperature, feel the two heater hoses. Both should be hot, verifying coolant is circulating through it. If only one is hot, the core may be plugged or have an air block. You can take off the core outlet hose and observe stream flow when engine is running and heater on high heat-flow should be slow but steady. The outlet hose will run from the firewall to the front of the engine into a fitting near the water pump. Some cars have a water valve in one of the hoses-make sure it is open, for coolant to circulate.

Mar 22, 2013 | 1999 Ford Windstar

1 Answer

I have 2000 astro van and I'm not getting heat, I changed thermo stat and flushed heater core. Still no heat, whats the next step?


Feel your heater hoses. If both are hot, the core is circulating. If only one is hot-poor or no circulation of the core.
If the heater core is circulating, the temperature blend door may not be working to let blower air pass across the heater core, and into the vents. If vacuum operated, watch the vacuum valves as you move heater controls-you may spot the problem. Check that the vacuum line from the engine to the control switch is working and still connected. If not operated by vacuum, the controls may have cables to the heater case or may be electrically operated. You'll just have to scope it out. Good luck.

Nov 24, 2012 | Chevrolet Astro Cars & Trucks

1 Answer

2001 Nissan Sentra, 1.8 litre engine - Intermittent heat, no obvious leaks, coolant ok. Temperature gauge indicates normal. Heat will come on for a short period of time (approx. one to two minutes) then...


The reply would have been with your question if it got answered.
Your problem is very typical of low coolant, but since you said that is not the problem, well maybe something else. It doesn't sound like coolant circulation is the problem either, unless you got some blockage in the heater core. Might be hard to diagnose that, but when you have no heat for an extended time, then feel both heater hoses-both should be same hot feel. If only one is hot, then circulation of the heater core is the problem , you would need to flush the core out. Try doing it by shooting water from a garden hose in one hose, and let the other hose drain it-watch for junk or stuff to come out.
If it is not a circulation problem in the heater core, then maybe your heater case is the problem, the doors to let blower motor air past the heater core may not stay open. These doors are either vacuum operated servos or small motors that open and close doors.

Apr 08, 2017 | Cars & Trucks

1 Answer

Heater will not blow out hot air in my 1988 ford F250. Thermostat and hoses are all good. Is there a sensor that may be causing the problem and where is it located?


Hello! There isn't a sensor that would disallow heated water to circulate through the heater core...If the temperature gauge rises to normal...And the upper radiator hose is hot along with the lower hose ...I can conclude water is circulating through the block...Question then becomes; Is it circulating through the heater core? And the answer to that is, I don't think so...With the heater control turned on high feel the outlet heater core hose (facing engine it's the one on the left) if it feels cold or not as hot as the inlet then one of two items are at fault...#1...The Plenum assembly, which the heater core sets in has an open vacuum line...#2...The heat control valve cable or the valve itself is not opening...See picture of valve below...It is on the firewall...Let me know if heat is passing through the heater core...If hot water isn't passing through the core and the valve is opening than the core itself is blocked...send a comment...Guru...Saailer

saailer_214.jpgMOTORCRAFT Part # YG229...$20

Oct 09, 2011 | 1988 Ford F 250

2 Answers

Will my coolant not circulate if my heater core is out? If my heater doesnt work does that mean the heater core is out?


change out your thermostat, heater core will leak inside of car if damaged and another thing the water pump is what circulates the coolant thru out engine

Feb 23, 2011 | 1997 Pontiac Sunfire

1 Answer

Heater core is pluged , no heat going to car


Flush or replace the heater core if it is plugged up and no heat going into the passenger area of the vehicle.

It could also be a bad blend door actuator if the heater core is hot and there is no heat inside the car circulating.

Jan 12, 2011 | 2004 Audi A4

2 Answers

1997 Chevy Cavailer Heat stoped working


Check your coolant level. If it is low and there is no obvious signs of a leak do a compression check on the engine (possible blown head gasket) or the fan / thermostat is not working properly.

Nov 23, 2008 | 1997 Chevrolet Cavalier

1 Answer

No heat,ch.thermostat,water is circulating,blower goin strong .


Check the 'heater control valve'. This valve opens when u turn on the heat switch on the dash, so the hot coolant will flow thru the heater core and provide heat. So although the coolant is circulating in the engine, the valve controlling the flow to the heater core is stuck closed, or not working.

Nov 15, 2008 | 2000 Ford Focus

1 Answer

Heater in 1998 Ford Taurus


When u flushed the radiator, what did u find? Was the old coolant dirty, rusty, sediment in it? What u describe sounds like the core is plugged up w/ junk. This would be my 1st choice of the problem, especially if the coolant was rusty, cruddy, as described above. It wouldn't be an air pocket (after a couple of years). Some cars do have a valve that opens and closes to allow the hot coolant into the core for heat, or a flap door that opens to allow the fan to blow air thru the core for heat, but the fact that this started when u flushed the system leads me to believe it's a plugged up core. U could try to flush the system again, make sure the heat is on when u do, so u have circulation tthru the core to help flush it out. let me know how u make out. good luck!

Oct 23, 2008 | 1998 Ford Taurus

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