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Since i changed the coolant air bleeder ihave no heat inside the auto

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Bleed system again sounds like there is an airlock

Posted on Mar 26, 2011


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I'm working on a 2002 Pontiac Montana 3400 motor. I changed the heater core to fix the water leak and lack of heat on the inside of the vehicle. and when I crack the vehicle to check for leaks and to check...

You need to bleed the air from the cooling system. The bleeder valve is located just behind the water pump housing. It is a small hex head (7MM) screwed into the coolant bypass tube. Pour coolant into radiator with the valve opened until coolant comes out of the valve. The cooling fans will not come on until the temperature reaches 225 degrees.

Feb 18, 2015 | 2002 Pontiac Montana

1 Answer

Little heat coming out of vents on my 1999 cutlass

You may have air in your lines. Open your radiator, then start your car and let it run for a while, add coolant when it drops low. There are bleeder screws on your car for your coolant. When the car is at normal operating tempature open your bleeders untill coolant starts to come out. On my 3.8L V6 you just have to follow the top coolant hose to where it connects to the intake. You will most likely need a flat head screw driver to open it. Then as the coolant drops again keep adding coolant. You may want to have a drop pan and tarp under the car, coolant will pour out of the radiator at times. Not a ton, but don't be concerned. This may take up to 20-30 minutes to complete. If you open the bleeder and coolant comes out right away it would lead away from air in your lines. Last thing have your heat on in the car the whole time. Hope this helps.

Jan 25, 2013 | 1999 Oldsmobile Cutlass

1 Answer

Car has know heat

Have you recently had any work done on the cooling system? If so, you most likely have air trapped inside the system, and you will have very weak heat until the system is properly bled.

Depending on your car, you may have a bleeder screw somewhere near your overflow tank. You just start the car and let it warm up(park somewhere that the front of the car is higher than the rear) turn your heat on to it's highest settings, on the defroster. now slowly open the bleeder screw until only coolant slowly flows from under it, then retighten it. (be very careful to not open it too fast, the coolant will be extremely hot!!!!!! Only open it enough do the the coolant trickles out). Continue doing this until only coolant comes out as soon as the screw is opened. Check to see if you have heat, if not, go for a spirited drive, while the heat is still blasted, and try to bleed it again.

If you don't have a bleeder screw, the process is essentially the same, except instead of open the screw, you will be massaging the coolant lines. Litterally just squeezing them over and over. Just do the ones you can reach without burning yourself. All you are trying to do, is force the air out of where it's trapped and back into the overflow.

If bleeding the system has no change, it may be time for a new heater core.

Mar 14, 2012 | 2000 Nissan Maxima

1 Answer

I have a 2000 chryler concorde with no heat. I changed the thermostat.I 've checked the coolant. The blower is working but only cold air. Any solutions

if you have changed the thermostat. did you bleed air out of system, if air is trapped in system it will not heat right! drain radiator and flush it good, but when refilling turn heater on high heat. then bleed air out when refilling system. most all cars have a bleeder for air. if in doubt, call any auto parts store to find out where yours is. if air is in system you will see bubbles appear from bleeder. also when flushing engine, make sure you start vehicle so it circulates through engine as well as refilling system. if the upper radiator hose gets hot then check for heat from car if it is ok! close bleeder and make sure radiator is full. I think the biggest culprit is air trapped in system. before starting the flush, be sure its not caused by low coolant in radiator. have a good day!!

Nov 05, 2010 | 2000 Chrysler Concorde

1 Answer

How much coolant do I add to top up if warning light comes on

If the coolant level gets too low, the air gets inside the cooling system and there's no proper circulation. Here's how you can fix it yourself: turn the heater on maximum temperature (inside the car), then start adding BMW coolant (it has to be the BMW coolant) to the overflow tank -cooling reservoir. Some models have a bleeder on the upper radiator house, so you have to loose the bleeder. The fluid will push the air out- also there may be a little of coolant coming out, which is O.K..
Next, tighten the bleeder after the coolant reaches the maximum level,close the reservoir and start the engine and wait till it warms up to the normal operating temperature or in other words, when the cooling fan (the fan is just behind the radiator) turns on and off. One more thing, there should be hot air blowing out of the heater inside your car. If it blows cold air, there's still some air in the cooling system and you should see a mechanic.If you don't, you might over-heat the engine.

Jan 30, 2010 | 2001 BMW 330

1 Answer

No heat changed thermostat flushed engine new coolant

did you release air from cooling system when replacing coolant!! if air is trapped in system it will not heat up proper. turn fan on high heat locate bleeder for cooling system, open bleeder with car running. if there is any air in system you will see it come out of bleeder. keep checking for heat. when you get heat bring coolant to proper level. leave top off of coolant recovery tank while bleeding system. put cap back on when done.

Nov 17, 2009 | 2001 Plymouth Neon

1 Answer

Cold air blows instead of hot once heat is engaged

Check the coolant level in the car first off and make sure it is at the correct level and you have plenty in the reservoir. Find the little bleeder screw on the thermostat housing should take an 8mm wrench to open. Start the car and turn the heat on high while the car is running open the bleeder screw and watch for the air to come out leave it open until it pushes out solid coolant without air bubbles in it. Make sure to keep the coolant level up while doing this, the heat should start working. Once all the air comes out shut the bleeder screw.

Oct 04, 2009 | 2000 Oldsmobile Silhouette

2 Answers

Dakota 4.7 liter engine heating

run the engine when warm, open bleeder screw slightly. air should come out, wait for steady stream of coolant. Then lock down bleeder screw.

Jul 26, 2009 | 2000 Dodge Dakota Quad Cab

1 Answer

I used the bleeder screw to release the air pocket on my 2002 PT Cruiser but the air pocket keeps forming again.

fill coolant with bleeder open until the coolant comes out of the bleeder. if it still over heat and has air in the system replace the head gasket. hope this helps

Jul 01, 2009 | 2002 Chrysler PT Cruiser

2 Answers

Cant find bleeder valve foe coolant system on 96

dr_greg is incorect. The bleeder valve is on the thermastat housing near the intake manifold. Follow the hose from the top of the radiator to the the engine. Look for something that looks like a 12mm head nut with a metal nipple comming through it. If you change your coolant but do not open this valve untill coolant flows from it you may cause an air pocket to remain in your engine, possibly causing your car to over heat.

Apr 08, 2009 | 1996 Honda Accord

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