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Air in cooling system

How do i purge the air out of cooling system after changing water pump ?

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You need to 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.It's a lot to do,but it works for me every time :-)

Posted on Dec 13, 2008

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Posted on Jan 02, 2017

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Are you sure you have purged all the air out of the cooling system? That would be the most common issue.

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How do i purge the cooling system after changing the thermostat

I assume you mean purging the system of air?

Many cooling systems are well designed and are self-purging. A few need to be carefully refilled and sometimes a hose or two needs disconnecting. Sometimes there are strategically placed cooling system bleed screws.

These days there are clever tools available to help avoid the fiddling about needed to bleed air from troublesome cooling systems. Basically it is a vacuum pump that evacuates the air from a cooling system before allowing atmospheric pressure to charge the system with coolant from a reservoir.

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How do i purge cooling system for 3.5 intrepid 2002?

Start by repeatedly squeezing all of the coolant hoses you can access. While doing this you should see bubbles coming up through the radiator cap opening. After doing this for awhile, top up the coolant and drive for a bit. After the car cools down you may want to repeat the process. Keep checking it for awhile as properly "burping" a coolant system can be a pain and take awhile. You know you're done when there is no more air at the top of the rad cap after driving (and letting it cool down)

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Well Michael put your hand on radiator upper hose and then the lower hose right after car warms up and just starts overheating is there a temperature difference if so one of two things is going on thermostat not opening even though it is new or there is still an air bubble in the cooling system if nthere is no difference and still overheating might have to explore headgasket being blown

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Just replaced water pump on 94 Nissan quest still getting hot just need to know how to purge it with out a purging screw Thank You

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1999 cadillac 4.6L keeps overheating. Changed thermostst, water pump, no leaks, heater not blowin, oil not milky. What could it be?

Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.

Air locks in the Northstar engine shouldn't be a problem as the system is self purging.

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1994 Toyota Spacia

Are you using a TOYOTA thermostat? The OEM 'stats have what we refer to as a "wiggle valve", and the 'stat should be inserted with this valve point straight up to 12 o'clock. This allows air to be purged from the cooling system. If everything is good, you may just have a "air blockage"; the system will not pump air in the cooling jacket, the water pump will just cavitate the air, resulting in your overheat condition...

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