Question about 1996 Pontiac Sunfire

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Cooling system what is the best procedure for bleeding air out of the cooling system? water pump just replaced, car is still running hot, haven;t replaced thermostat yet. thanks

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  • sarriaga Oct 14, 2008

    i need the procedure of bleeding the coolant system of pontic sunfire 2001, 2.2L

  • Anonymous Jan 03, 2009

    mine is 2002 don't know how to bleed it

  • Anonymous Mar 30, 2014

    replaced all the cooling system runing about 210 to 220 dont know if i put the thermostat seal in right

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I have a 2000 nissian qeust that is overheating and I guess it has some air how do we bleed the system? also it is not blowing air in the front what could be the problem of this major overheating?

Posted on Nov 04, 2008

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Will an air pocket in the coolant system cause it to overheat or over pressurize on a 2001 Nissan Sentra ?


1. The radiator cap if working correctly it will release pressure in the system provided the cap you have is the correct pressure setting. If you are having a problem with pressure then replace the cap with a new radiator cap with the correct pressure setting. Do not use a cap with a pressure setting other than the original equipment pressure spec. So you do not go to the parts store and buy any radiator cap on the shelf that fits because they come with different pressure ratings and some of these will be totally unsuitable for your car.

2. If the pressure valve is stuck in the "old" cap the pressure release system will not work.

3. Overheating
Air pockets in the cooling system can definitely cause overheating and can retard coolant flow through the system. If you are draining the radiator to replace the coolant or replacing the radiator you need to follow the correct procedures for bleeding air out of the system for that particular engine after coolant refilling. Some engines have bleeder screws on the cooling system to assist in the air bleeding procedure and some don't.

There are various causes for overheating so don't assume it will necessarily be solved by bleeding any remaining air from the cooling system and replacing the radiator cap with one that works.

Other causes can be...........
1. Faulty cooling system thermostat. (Replace the Thermostat)
2. Faulty water pump, especially if the impellers have corroded away or have disintegrated in the case of those design genius water pumps with plastic impellers. (Replace the water pump)

3. Cooling fans not working and if so the cause needs to be tracked. Check that your fans are kicking in. If the engine is overheating the fans should be running because they will switch on when the coolant reaches a specific temp and well before the coolant gets excessively hot.

4. A partial blockage in the coolant passages inside the engine but not in the radiator if you have a new one. If the coolant is not changed at the required intervals(frequently the case with many owners) or is over diluted with water you can get a build up of debris. If products like stop leak have been used in the system this can create similar problems with partial blockages inside the engine coolant passages.

5. A compression leak into the cooling system.
If you have bled air from the system and have continuous air bubbles in the cooling system I would suspect a compression leak. In that event a basic leak down test will show if you have compression gasses leaking into the cooling system and from which cylinder(s). The spark plug is removed and compressed air is forced into the cylinder via the spark plug fitting and air bubbles will show up in the coolant of there is a leak into the cooling system.
--------------------------------
Have the problem with overheating addressed immediately. Running the engine with an overheat condition will cause expensive engine damage many times the cost of fixing the overheating issue.

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Dec 29, 2015 | Nissan Cars & Trucks

2 Answers

Dan how do I bleed 2004 Kia coolant car temp is good but sometime at idle heater starts to blow cool hit throttle gets great heat


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.

Jan 11, 2015 | 2004 Kia Sorento

1 Answer

02 ford explorer 4.0 overheating and suddenly blowing cold air, then hot again while engine runs cool but not long


Most likely you have air trapped in your engine, particularly in the heater loop. You need to properly bleed the air out of your radiator cooling system. The hot and cold blasts of air coming from first hot water followed by air.
Read up on how to bleed air out of your radiator system. Some systems are very difficult to bleed.
If after doing a good bleed of the radiator system the problem returns, you may have a bad head gasket or other leak in your cooling system which is injecting air into the cooling system (radiator/water cooling system).

Aug 12, 2014 | 2002 Ford Explorer

3 Answers

Engine overheating i have replaced the radiator has plenty of water


replace thermostat.then bleed coolant system, this is how you do it.fill the cooling coolant system with 50 / 50 dexcool and water to raise boiling point,straight water will evaporate boil away cause engine to overheat catch fire thats why you need 50 / 50 mixture antifreeze and water.to bleed coolant system first fill coolant system until coolant stay at the full cold mark on the the coolant overflow jug,then you start engine allow it to idle,place the heater and ac control in any ac setting except max and the temperature control to the highest setting,run engine until lower hose to water pump is hot. with the engine hot run the engine speed up to 3000 rpm and allow it return to idle, repeat this 5 times. slowly open the bleed valve on the thermostat housing or look for bleed valve at the water pump heater hose.open bleed valve for 15 seconds to expel any trapped air.then top off the coolant as necessary,and when top radiator hose hot thermostat open up.keep adding cooling to overflow until coolant level stop at full cold mark dont over fill coolant.if engine seem like overheating while looking at cooling gauge turn off engine wait a while until cool off add more coolant until coolant level stay stable and dont drop any.when open radiator overflow cap use large rag over the radiator cap to keep from getting scald open radiator cap a little at a time but dont open radiator cap until engine cool down first.replace the radiator overflow cap, thermostat,and engine coolant temperature sensor and check the cooling fans fuses and relays see what happens.

Aug 18, 2012 | 1998 Oldsmobile Intrigue

1 Answer

Cant bleed air out of cooling system


Okay...........best way to actually bleed air out of a Taurus cooling system is to take loose the heater line returning
to the water pump, install a back-flushing tee in the hose, and start the engine while full of antifreeze.
Do this while engine is cool. While engine's warming up,loosen the cap on
the tee and let the air bleed out.KEEP the antifreeze away from the alternator and other components while you do this.
Of course,this will only work if you haven't got a BLOWN HEAD GASKET,letting compression seep into coolant.don-ohio .

Sep 16, 2011 | 2000 Ford Taurus

1 Answer

2001 Aurora water pump replaced but now every time car is started Low engine coolant warning comes on but goes out when reset and doesn't come back on until car is started. Checked and coolant level is...


On the Owner's Manual there's a procedure you have to follow to bleed the air in the cooling system, until you bleed the system for air, the low coolant light will come on every time.

The process is rather simple and quick, all you need is a flat head screw driver.

DO NOT OPEN THE COOLING SYSTEM WHEN HOT.

Good Luck!! Don't forget to rate this post!!

Sep 03, 2010 | 2001 Oldsmobile Aurora

1 Answer

Top hose hot and bottom hose cool...replaced radiator,condenser auxillary fan unit/resistor, replaced harness (spliced) from aux fan unit to temp sensor in the radiator...fan wont work and I dont think...


sounds like your water pump is air bound ( there is a air bubble in your cooling system,or your water pump isn't turning.Bleed the cooling system by jacking car upso the antifreeze fill area is the highest point and run the engineat 1500 rpms add water if it goes down that tell you that the water pump is pulling.Also see if you have a air bleed on the cooling system.Keep the rpms up until you can't add anymore water then put cap back on before returning the engine to normal idle speed.

Aug 09, 2009 | 1994 Volkswagen Jetta

1 Answer

I replaced the water pump and thermostat but now it runs HOT. Any help? 2004 Dodge 1500 Ram Quad- 4.7 motor


did u bleed the air out of the cooling system? follow the service manual procedure to the "T" for bleeding the air of the cooling system.

Jul 26, 2009 | 2005 Dodge Ram 1500

1 Answer

Air pressure in the engine


Sounds like air in system, does the temp guage fluxuwate or run higher than normal? or heater thros little or no heat? Do the cooling fans come one like they always have? thies are all signs of air in cooling system, and needs to be bleed out.

Apr 22, 2009 | 1993 Chevrolet Camaro

2 Answers

Engine overheating


The best way to flush it would be to take off the bottom radiator hose and pump water through the fill nozzle after all the coolent is out you can then hook the hose back up and replace it with new coolant.

Feb 01, 2009 | 2000 Pontiac Grand Am GT

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