Question about 2004 Dodge Ram 1500

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How to bleed an air pocket out of a heater line

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There should be bleed screws where the rad hoses join to water pump,thermostat housing ,also run engine with the heater turned to full heat when doing the bleeding as can get air pocket in heater matrix

Posted on Apr 22, 2014

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2006 jeep commander overheated replaced leaking heater line and thermostat. Now I have no heat even after the engine warms up.


Good chance you have air pockets in the cooling system. You may need to bleed the air out and add more coolant.

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Sounds like it was not flushed properly and bleed of air pockets. Many engines have bleed screws to bleed all the air out when refilling.

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My 2002 Oldsmobile Silhouette keeps overheating. We replaced the thermostat and flushed the system by adding new antifreeze. The air blows cold from the heater when the car starts to overheat. Once


there can be air pocket somewhere you need to bleed system properly. rais the front let is idle bleed it thru bleeding screw. be sure that bubbles are over.

air pockets prevent coolant travel inside system. so it may not reach to radiator, or cabin heater or both.

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Old methos id to leave the raditor cap off and squeeze the coolant hoses to get the air out.

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Bleed your cooling system. You have a air pockets in your system. Don't forget to run your heater full blast when doing so. Usually help to unplug your heater hose and flush out the heater core then work on getting it filled and getting all the air out of your system.

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Do you have a sloshing sound in your dash? You may have an air pocket in your coolant lines that you need to bleed. I had this problem about 6 months ago in my '05 Impala

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1 Answer

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first of all I would make sure the car has proper amount of coolant and you are right it is very possible you have an air pocket in the system also ask your self did you change the thermastat after you did the heater core when the car is cold make sure there is coolant at the cold mark on the reservior bottle because you might not have enough coolant then start the car and get it up to temp and if the coolant goes not go up to the hot mark when the car gets to temp you do not have enought coolant just keep adding coolant and you will see the bubble after the thermastat opens

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1 Answer

My heater is blowing just air, but no hot air?


Check to make sure that hot water is making it to and from your heater core. There are usually two lines that direct water (coolant) to and from the firewall from the engine (not the A/C) system. These lines are usually heater hoses.
If both of the lines are hot, there's a problem with the blend door, or an electrical fault in the controls or wiring. If one line is hot and the other one cool, your heater core is either plugged or had an air pocket. The latter will require bleeding the cooling system and the former will require replacing the heater core, (not a job for the faint of heart). Also, check the thermostat to make sure it didn't fail in the open position.

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