Question about 1999 Dodge Caravan

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Rad hose has air lock how do you get the lock out..

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When a cooling system has been drained, air is allowed to enter the system. Before refilling the radiator, remove a heater hose or the upper radiator hose and thermostat from the engine side. Then, pour the antifreeze / water mixture into the cooling system until it comes out of the heater hose nipple or thermostat housing. The idea is to vent the air from the system at the highest point possible. This way, air is purged form the system and only liquid is contained. When the liquid just starts to run out, replace the hose that was taken off and finish refilling the system. It's easy, it's free, and it works!And, it could save you from thousands of dollars in engine damage.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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I have no heat inside my cab on a 2003 dodge ram 2500. heater core is not blocked


either you have a bad thermostat or you have a air lock in your heater hoses remember your heater is fed by the hose by the upper rad hose return is the hose going to the water pump, to bleed the air out fill rad leave the rad cap off start engine run for 5 min. the check the coolant level,fill to top of neck replace rad cap tight, K-D tools make a special funnel to solve this air lock problem

Aug 09, 2014 | 2003 Dodge Ram Pickup 2500

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Running hot think it is air locked how do you bleed air from it


Loosen the cap on the rad and run the engine up to operating temperature. Make sure the rad is full, and go for a short drive around the block to warm up the engine. Make sure the heater is turned on high and the fan running full. There will likely be some burping and gurgling going on as the air gets forced out. Keep checking and topping up the rad. Eventually it will stop.You should run it for acouple days with the cap loose to be sure all the air is out. After that, make sure the rad is full, close the cap and top up the overflow bucket.

Nov 23, 2013 | Toyota Camry Cars & Trucks

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There's a clunking noise coming out of the lower rad and it's making the hose pulsate. There is no pressure on no hose No heat


is cooling system full of anifreeze..if not it has an air lock in it that clunks like a steam radiator in an old building...need to check level and maybe replace thermostat..

Feb 10, 2013 | Cars & Trucks

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How to change thermostat on 2000 caravan


Follow top rad hose to the housing remove two bolts on housing that the hose attaches to after removing rad hose on engine side, pop housing off and change thermostat. Once changed reverse procedure start vehicle with cap off filling antifreeze watching your temp guage and wait for the fans to come on to work air locks out of system. Once fans have cycled and level has dropped you should have good heat and be able to cap your rad. DONE! Be careful not to get burned!

Nov 21, 2012 | Cars & Trucks

1 Answer

My radiator dumped all the fluid out and now that I've refilled it my heater only blows cold air


You have a air pocket (air lock) in the system, remove the rad cap, add coolant with the heater on, sometimes it takes awhile to get the air lock to move, I have had to remove one of the heater hoses (easiest one) and pour coolant in the hose to remove the air.

Feb 03, 2011 | Dodge Grand Caravan Cars & Trucks

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I have a lincoln ls 2000 I had the heater hose replaced n no w my heat doesn't work and my fan is running slow me or themechanic don't know what it could be do u know


Could be an air lock in your heater core. Sometimes when you change a heater/radiator hose you do not get all the air out of the system. This typically happens in the heater core. Sometimes you can cure this by parking the vehicle on a steep grade with the front towards the top. You have to leave the car there for several hours to allow the air to gravitate to the top. If that doesn't work drain down rad to bellow top heater hose, remove top heater hose and add coolant untill it comes out top heater hose fitting. Put hose on quickly and completely fill rad. It helps if you have a friend fill the rad while you get ready to put hose back on. Good luck

Oct 25, 2010 | 2000 Lincoln LS

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Cooling system air valve


there is a velve in the top hose look at the higest hose in the engine bay you will fine a screw or a nut in one of the hoses take the rad cap off and top the rad up fully run the engine up and undo this screw till the water pumps out it should let the air out first, when only water comes out the engine is bled free of air, keep the rad uped up at all times

Jul 22, 2010 | 2007 Chevrolet Impala LS Sedan New Cars

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Radiator fluid is spewing over the engine block. Have to add fluids continuously, however engine is not over heating.


if its not a split hose or a busted rad, have a "sniffer test" done on the water in the rad,,,,a "sniffer test!"
is slang for a hydrocarbon test,,,its a quick test were they **** some water out of the rad and mix it with a chemical if this chemical changes colour there are hydrocarbons in it,,, if there are any hydrocarbons in the rad water it will show that the cylinder head gasket is leaking or about to blow out or worst there is a crack in the cylinder head,,, if its leaking hot gasses it preshers up the rad water to the point that the rad cap opens so it dont burst the rad open and this is were your getting the water from
you could on the other hand just have an air lock in the system were you let the rad water run very low? to bleed out any air thats traped in the engine block find the water hose with a nut or a screw in it,,its at the higest point above the rad,,, fill the rad to the top and leave the rad cap off,,,start the motor up and undo this screw or nut till water starts to leak out if air comes out first thats the air lock coming out wate till only water come out this bleed velve then close it off,,,top up the rad and run the motor up till its fully warmed up,,,ok,,now iv bored you to death,,,,but did i help you out or not? if so,,was it worth being bored out your skull for all that free info? no? that figers!

Jun 13, 2010 | 2001 Dodge Durango

1 Answer

I get all cold air / no heat when using defrost and all heaters


It is possible that you may have an air lock in the system. You need to drain the rad again and remove the upper most heater hose from the heater core and raise the hose up high . Fill the rad until coolant comes out of the heater core pipe. Carefully reattach the heater hose. Fill the rad slowly allowing trapped air to escape.This may take a while. Once the rad is full put a catch basin on the floor under the rad filler neck.Start the car and let it run to operating temperature.Allow the expanding coolant fall into the basin.Once you see circulation in the rad you can slowly top the rad off.once you do this replace the rad cap and fill the reservoir bottle 3/4 ways to the top. Shut the car off and let it cool off filling the bottle as necessary.Hopefully this will cure your problem. Good luck :-)


Dec 13, 2008 | 1994 GMC Sierra

1 Answer

92 towncar


It is possible that you may have an air lock in the system. You need to drain the rad and remove the upper most heater hose from the heater core and raise the hose up high . Fill the rad until coolant comes out of the heater core pipe. Carefully reattach the heater hose. Fill the rad slowly allowing trapped air to escape.This may take a while. Once the rad is full put a catch basin on the floor under the rad filler neck.Start the car and let it run to operating temperature.Allow the expanding coolant fall into the basin.Once you see circulation in the rad you can slowly top the rad off.once you do this replace the rad cap and fill the reservoir bottle 3/4 ways to the top. Shut the car off and let it cool off filling the bottle as necessary.Hopefully this will cure your problem. Good luck :-)

Dec 09, 2008 | 2000 Lincoln Town Car

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