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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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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017


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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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Thermostat housing was replaced but the actual thermostat was replaced also?
If it was replaced you might have issues with the water pump, the impellers of the water pump are made of plastic and some of them might be broken.
Also when the thermostat housing was replaced was all the air purged from the cooling circuit?
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First, you must have a properly installed thermostat that is working correctly. Second, Northstar engines are notorious for air in the cooling system after draining and refilling - keep checking the purge tank level after overheating and after the cooling system cools down. Third, make sure your cooling fans are working correctly (relay, fuse, temperature sensor) - check to make sure both are running when it overheats. If all the above is correct, the problem will probably be blockage in the system (try a flush) or your water pump itself is failing.

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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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1 Answer

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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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