Question about 1989 Dodge Dakota 2WD

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Heater in 1989 Dodge Dakota won't heat

Blower works but thermostat will not produce heat. Air conditioner works. Is there a control valve that allows hot water to flow into heater core?

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  • bbellow Jan 20, 2009

    A/C works, when blower is off and you change temp. from cold to hot. It only gets a bit warmer. If you turn on the fan you can't tell it's warm at all.

  • Anonymous Feb 09, 2009

    im haveing the same problem with my 96 and the thermostate whitch is a cheap fix was not the problem check the heater sontrol valve for leaks and then the heater core for a plug

  • Anonymous Mar 29, 2014

    where is it?

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New thermostat

Posted on Dec 12, 2008

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My 2002 Jeep Liberty 3.7 don't throw me heat only cold air


There is something called a blend door in the heater box. This door is what moves to change from cold air to warm air. The part is 86 dollars online. http://www.factorychryslerparts.com/products/JEEP/LIBERTY/ACTUATOR-Blend-Door-AC-and-Heater/4341513/05066519AA.html

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Truck will only heat for a minute then quits


make sure hot water is flowing thru the heater core by feeling both hoses, in and out, both should be hot. if not, maybe the valve is not opening to allow the water to flow. If both hoses are hot then maybe the heater valves are not working and you are just bringing in cold outside air instead of the air flowing thru the heater core and providing heater air. Could also be a sensor in the heater that thinks it is a lot warmer than it really is.

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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.

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I have no heat I have a new thermostat and the heater core dosent leak.


When you say you have no heat is this referring to nothing when control is turned on? Does fan work? or you have no hot air at all.
If no fan could be a blown fuse [blower motor] thermostat could be installed incorrectly or faulty. Could be a faulty heater control valve if you have one not allowing hot water into heater core.

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NOT GETTING ANY HEAT AT ALL, REPLACED WATER PUMP, THERMOSTAT, VALVE TAP ON HEATER HOSE CHECKED VACUM ALL WORKS CAR RUNS WELL NO OVERHEAT PROBS, AND HEATER CORE FLOWING WELL. JUST NO HEAT FROM HEATER AT ALL


Make sure the blower runs, then make sure the heat and ventilation control doors move as they should. If you have hot coolant flowing through the heater core, air flow through the core, and appropriate air flow path, then you will have heat.

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My heater is not working in my 2001 honda civic. Is it my thermostat?


Does the heater blow cold air from the vents or do you mean the there is no airflow from the vents? cold air from the dash vents when the heater control valve is set fully hot could be an air pocket in the cooling system. The radiator sits slightly lower than the engine causing air pockets to get trapped in the engine when you replace the coolant. you'll have to purge the cooling system to restore flow to the heater core. No airflow (blower motor inop) this could be a bad blower motor transistor. pin test the blower motor circuit.

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No hot air from heater, blower runs fine


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

Since you state the 2 things you ruled out, that leaves only the water pump. Is the car running hot? The thermostat may be sticking as well... but im leaning toward the pump.

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I have changed the theromast twice and flushed the coolant system.The heater core is not leaking.. the blower is still blowing cool air.


The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

if the car is not overheating, the thermostat is working fine.... replace or flush the heater core multiple times to try and eliminate sediment build-up.

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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.

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