Question about 1999 Dodge Intrepid

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Car over heats and have changed everything but water pump. Heater gets hot then turn cold

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Hi, Try stopping ona steep incline--does the heater stay warm? If yes, what you have is anair bubble that hangs at the heater hose until pressure from the water pumpblows thru it as the engine speeds up. Park on an incline, open theradiator cap, run the engine until the thermostat is open, turn the heater on, crackopen any/all bleed ports to release any trapped air, and fill the radiator tothe neck. Wait until the level stops dropping and make sure bubbles don'tcontinue to come up. If they do, you may have a blown head gasket thatwill keep forming these bubbles until you change the gasket. Please let me know if you have anyquestions and thanks for using FixYa.

Posted on May 19, 2011


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Posted on Jan 02, 2017


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My 2006 Nissan sentra will not put out heat. I replaced the thermostat and no difference. I removed the heater hoses from the block and ran the engine. Water just trickled from the hose. What am I missing?...

The first thing I would do is drain all of the fluid from the cooling system (check to see if there is an engine block drain and open that too) and replace it with water. Turn the temperature setting to full hot and run the car. Leave the radiator cap off when you do this since the fluid level will go down as the car warms up. Add more water as necessary. Now does the temperature gauge on the dash reach the middle setting? Any heat coming from inside the car? Listen to the engine do you hear any noise from the belt side? Possibly a bad water pump? Turn the car off and let it cool down for about thirty minutes. Drain the water out of the radiator (you can remove the lower radiator hose if necessary) and engine block. Notice any sludge coming out in the water? Close off all the drain cocks. Now start the car and add water to the radiator and start the process all over again. The car must be running as you add the cold water to a slightly hot engine to keep the engine block from cracking. Let the car run, watch the temperature gauge, keeping filling the radiator, check for heat inside. Any better? Wait for the temperature gauge to hit the middle point between hot and cold (normal running position). Any heat on the inside? Turn the car off and let it cool again for about thirty minutes. If there is no change then let it cool off for about an hour (engine cool to the touch) and drain the system again. Pull off the hoses that go from the engine block to the firewall (heater hoses). Turn on your garden hose and place it over one of those heater hose openings. Do not turn the water on full blast you may have a leak in the car and I don\'t want you to have a flood. How much water comes out from the other hose (be careful it could be hot)? I have even blown air through one of these hoses to get any water out of the heater core. It sounds to me like you may have some sort of blockage in your cooling system. When you pull off the heater hoses take out the thermostat again and put the garden hose in the engine block to get water flowing through the entire system (all drains and hoses are off to allow the most flow). When was the water pump changed on the car? One other thing that is critical is the possibility of a regulator valve inside the car connected to the temperature setting on the dash. Some cars today do not have any way to regulate the water going through the heater core (flows freely) but if your car has one of these valves it could be bad (frozen shut). Once everything is working correctly remember to fill the cooling system with 50% distilled water / 50% anti-freeze solution.

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could be you fitted the thermostat in the wrong way around ,or the plastic impeller on the water pump with a steel drive shaft has failed they end up with the drive shaft spinning but the impeller is not turning ,go for the thermostat first though .

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1 Answer

No heat, lincoln town car, new heat control valve, new radiator, new water pump, new heater coil

It looks like you changed everything involving the hot water. When the engine is warm, you should be getting hot water going through the heater core. By holding each hose from the heater core you should feel heat from both hoses. I did not see a new thermostat listed.

You need to also have the ductwork under the dash moving correctly. If you find that the water lines from the heater core are both hot, then you need the (doors) or flaps in the ductwork to route the heat inside. I do not see that anything was looked at under the dash.

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first in this problem you need to look for cheapest things to do which is start with you thermostat abd make sure its open and close by how much temp inside the eng. then u need to feel the input hose and the output hose which they come from the heater core they should have closely same temp . if there is non of them have any heat thats mean the water pump blower is broke and u have to replace the water pump, if one of the heater core hose hot and the other cold the problem in the heater core , about the A/C light is on the A/C comprasser shoul work with the heat becuase hot air + cold air = dry air which u need for ur front DEF

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the thermostat is stuck open. Youv'e got a little rust in the coolant, right?

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