Question about Jeep Grand Cherokee

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Air trapped in heater core, can not "burp" it out

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  • bisco1996 Feb 05, 2009

    I think i may have the same problem, i put a new radator and thermastist but still not much heat. Tried to flush the heater core but still doesnt work as it should. I can hear some gurggly sound after i shut the engine off so it probably has air. I would like to have some solutions to try before i decide to buy a new heater core and then find out that wasnt the problem.

  • Anonymous Feb 13, 2009

    I hawe

  • young_queen_ Mar 12, 2009

    if its a limited 5.2 liter, dont waste your time trying to fix it & the same with your air conditioning. it will go out again and soon. The best way to fix it is to get a plug in heater for added support my wife found that if you have it on vents first and then defrost it will give a little more heat she claims.

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I had the same problem with my 2000 and had to replace the blend door

james
G3Reseller.com

Posted on Nov 15, 2009

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1 Answer

Front heat blowing out cool air. Just flushed the system yesterday and got the air out and still nothing


With the vehicle up to operating temperature feel of the heater hoses going to the front heater core. if only one hose is hot then you either have a plugged up heater core or an air bubble trapped in it not letting water circulate. You might try loosening the top hose and try to burp the air out of it. Of might have to remove the hoses and try to blow compressed air through it backwards to free up the blockage.

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Could be air trapped in the heater core, flush your cooling system and burp it of all the air in the system by running it at idle until it's hot you will see bubbles come up to the radiator cap, install cap, then drive car, next day refill coolant. OR it could be a bad heater core in which case it's an expensive repair that costs more than the car is worth.

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I don't believe you have air in your system. It sounds like a sticking thermostat to me. But you better figure it out quick those neon motors don't like big temp changes. Your playing with cracking or warping the head. Any way here's what i know about burping.
When you drain & refill a cooling system air is often traped in places like the heater core. If so the coolant level will appear full before it really is. To burp you need to add coolant till full or just over. Adjust the heater control to MAX heat. This will let full force of water pump to push air out of heater core. Fan speed dose not matter. Next start the motor & let it idle. As it warms up the thermostat will begin to open and close. This is when you should see fluid level drop as trapped air is pushed from system ( add fluid as needed). If this is working right you should fell quite hot air coming from heat vents. If air doesn't seem hot enough adding RPM by pulsing gas pedal should do the trick. And that should do it.

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1 Answer

Burp cooling system how is this done


When you drain & refill a cooling system air is often traped in places like the heater core. If so the coolant level will appear full before it really is. To burp you need to add coolant till full or just over. Adjust the heater control to MAX heat. This will let full force of water pump to push air out of heater core. Fan speed dose not matter. Next start the motor & let it idle. As it warms up the thermostat will begin to open and close. This is when you should see fluid level drop as trapped air is pushed from system ( add fluid as needed). If this is working right you should fell quite hot air coming from heat vents. If air doesn't seem hot enough adding RPM by pulsing gas pedal should do the trick. And that should do it.

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The heater core is not usually the place to get trapped air out of the coolant system. But if you suspect an air block in the heater core. pull off the heater outlet hose loose at the engine, while the car is running. Before you start the car, loosen the hose clamp and have the hose ready to pull off. Start the car with the heater on high heat setting, then pull the hose off and watch for a slow steady stream of coolant from the hose. When you have a steady stream flow, you have no more air in the heater core. To purge any remaining air in the system, leave the radiator cap off with engine running until the car has reached normal operating temperature. Then shut off the car, top up the coolant in radiator and overflow tank, and put the radiator cap back on.

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Look on the thermostat housing for a bleed valve to let out trapped air. What I would do is take off the heater outlet line and run engine till coolant starts to flow out in a steady stream. It should only take a moment. Which is the outlet? The inlet will come off top of engine, either a cylinder head fitting or the intake manifold, and go to heater. The outlet will likely rout to near the water pump and enter engine there.

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1 Answer

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may have air trapped in your heater core or even just your thermostat is stuck open causing the engine to run cold replace thermostat and burp air out of heater core

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1 Answer

My 1999 mercury villager heater is not blowing hot air


you have air trapped in the heater cores, front and back. You need to burp system or take to a shop and have them flush cooling system and use their vacuum system to purge the air. Should cost $60. Make sure they have vacuum system.

Or go to our site and read file on how to burp air from cooling system.

http://groups.yahoo.com/group/villagerquest/

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when you changed the therm you let air into the system and it will usually cause a air bubble in the heater core you probally should try to burp the system there is usually a plug or a relief valve check with your dealer fro instructions on how to burp the air out of the system try that first befor4e trying to replace the heater core

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1 Answer

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The Number 1 issue with no heat, is AIR. Air can get trapped in the heater core resulting in no heat. when Cold, open the system and run it at a high idle... about 1500rpms, driving it a short distance will also work, with the cap loose so it can burp any air trapped, then top off the coolant. A pint low is all it takes.

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