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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Posted on Jan 02, 2017

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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.
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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

2 Answers

Overheating


Well one hot and one cool hose means the coolant is not flowing thru the radiator. That could be from a defective pump, closed thermostat, air in the system, or a blockage in the radiator. You might try running the engine with the thermostat out to check flow.

May 30, 2013 | Chrysler Cars & Trucks

2 Answers

I have a 89 pontiac firebird Trans Am "GTA" 5.7L tuned port injected. My engine gets hot somehow and my car has a quick start but lower power afterward. What could the problem be?


Fix the radiator cooling problems. You will damage the engine if you keep running the car in an overheated condition.

1. Replace the thermostat in the cooling system
2. Replace the water pump
3. Flush the cooling system thoroughly and re-fill with the correct coolant. Bleed any air out of the system otherwise you will have problems with air blockages and thus poor coolant flow.

You probably do not know how to do any of this so take it to a reputable workshop or cooling specialist to have it done.

Dec 25, 2012 | 1989 Pontiac Firebird

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

2 Answers

My car said "engine hot


Full coolant level does not mean your engine cannot overheat. You need to fix the problem as overheating will destroy the engine if not addressed.

The radiator cooling fans must be working, as must the water pump. The thermostat must also be working properly.
There must also be no air in the cooling system as air locks will impair water flow. When cooling systems are drained fully or partially and re-filled air in the system must be bled out using the correct bleeding procedure for the particular engine/cooling system. Failure to do this properly will lead to overheating.

If you ONLY see the overheating warning when running your aircon you need to check that the electric radaitor fans are kicking in at idle when you switch on and run the aircon and the engine has been warmed up some. If they do not start operating when the a/c is running you will get an overheating condition in normal driving conditions.

If the radiator fans are operating normally and you still get an overheating warning when the aircon is on or off the most likely culprit is a faulty thermostat in the engine's cooling system which will need to be replaced.

If you have either a faulty thermostat or if the water pump in the cooling system fails you will get continuous overheating whether the aircon is on or off.

Sep 05, 2011 | 2006 Chevrolet Impala

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

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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