Question about Dodge Ram 1500

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My heater worked great until I had the thermostat changed as it was starting to get hot. I then had the water pump changed as it was leaking. I just replaced the radiator as the drain plug was leaking,the radiator was only 2 and a half years old. I now have hardly any heat.What do I have checked now.

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The heater core could be partially blocked with scale/rust buildup. flushing the system might do the trick. good luck, hope this helps!

Posted on Nov 06, 2010

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Posted on Jan 02, 2017

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I agree with your logic. Attached vid addresses bleeding. Sounds like at low rpms, not enough flow to transfer the heat. So bubble or maybe a partially obstructed core. There are a couple of vids on clearing a core... GOod luck, let us know if you figure it out.

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I have had a new radiatorput in and a new water pump put in my jeep liberty 2002 I still have to put antifreeze in because of a leak and my heater does not work any suggestions? they said there was a...


You did not say you replaced your thermostat Change the thermostat. Sometimes new thermostats stick. Test the new one before installing by putting it in hot water and watch to see if it opens or closes.

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Suspect you have a loose clamp on a radiator hose or the oil change guy made something leak. There is a tool which is similar to a a bicycle pump in that it pressurizes the water system and your engine does not have to run or be hot to test. Some major auto parts stores may have a loaner.

Its going to stay hot and lose pressure until you fix the leak.

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have your heater core pressure checked. it maybe clooged even though you had system flushed. additionally did you buy the correct thermostat? the computer is a sensitive thing and alot of other components are activated because of the temperature. the opening temp is 188-195 degrees. so you should have bought the 185 degree thermostat. i had same problem and bought the higher temp thermostat. i couldn't believe that such a small change would make a big difference. good luck.

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Remove and raise upper hose at thermostat end and remove lower rad hose.
Fill rad with a hose and watch for flow from bottom rad hose and/ or bottom rad hose connecton.......water should fall though rad easily.
Honda rads are cheap.....any restriction....replace rad.

Remove thermostat....fill thermostat housing with hose and watch for water flow at bottom rad hose.
Flush good.

Remove heater hoses.......flush back and forth until a good flow is present "With heater control set to hot" if no or poor flow....replace heater core.

Stop leak can plug everything.

Also.......not likely causing over heating....but ....at your mileage,if you do not know if the timing belt has been changed.....CHANGE IT NOW!
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Thermostat?


It actually sounds to me like you're low on coolant. My Jeep leaks coolant and whenever it gets low the temp gauge will go real high and then drop, and the heater doesn't work well. This is because the cooling system of your car is supposed to be a closed system, full of coolant and no air. When coolant leaks out, the space it used to occupy is now occupied by air, which does not transfer heat well. When 'air' is passing through your cooling system, no heat can be transferred from your engine to the heater and radiator, resulting in a hot engine and no heat at the heater. Then when a pocket of water passes through the system, the temperature gauge quickly falls as the water absorbs the heat from the engine. The hot water that cools the engine is where the heater gets it's heat from as well, so when water passes through the heater core, the heater works, but when it's filled with air, it doesn't.

Hot water runs through the heater core regardless of whether or not your thermostat is open or closed. That's why your heater works in the winter even before the engine is at normal operating temperature. The fact that the heater stops working is a good sign that the thermostat is probably not the culprit.

As for the water pump. If the water pump was bad, your temp gauge would go into the red and stay there. Water pumps generally don't work intermittently. Either it's good and ot works, or it's bad and it doesn't.

However, if you are in fact low on water, as I suspect, it means you probably have a leak somewhere. The leak could be in the water pump housing gasket, so depending on where you take it for repairs, they may try to sell you a new water pump anyhow. So just beware of that.

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