Engine needs to burp
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Joined: Sep 2011
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Engine needs to burp
After changing antifreeze, there is air in my radiator that I can't seem to get out. I never had this problem before when I changed my antifreeze. With the pressure relieved, there is no water in the upper hose. This causes the engine to over heat until the thermostat opens and then cooling is good. I changed the thermostat thinking this was the problem, it's not. My truck is a 97 F150-4.6 engine. How do I get the air out of my system so my cooling will be normal again?
Thanks, Glen
Thanks, Glen
Hotshot
Joined: Jul 2005
Posts: 11,931
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Park on a good hill with the hood pointed up... air goes toward the radiator.
you can also put a TEE in the heater hose above #3 cylinder and remove the flush cap on the TEE to vent out air and let the antifreeze rise up to the vent.
you can also put a TEE in the heater hose above #3 cylinder and remove the flush cap on the TEE to vent out air and let the antifreeze rise up to the vent.
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Thanks Steve, I did that the other day and thought the problem was fixed. Maybe I'll try some head sealer to see if that helps. After lots of reading here, I could have a small head leak causing my problem.
Lead Driver
Joined: Sep 2006
Posts: 7,907
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The thermostat needs an 1/8" hole in it's rim to pass air.
Take the cap off when cold, start engine and let it run until the thermostat opens.
How you know this is by feeling the upper hose gets hot when the stat opens as well as the feed hose to the heater.
Squeeze the upper hose using it as a pump of sorts to help force air to the tank.
Watch the tank for bubbles and keep it filled to the hot line as the coolant replaces the air in the system..
When it's all settled down put the cap on.
Good luck.
Take the cap off when cold, start engine and let it run until the thermostat opens.
How you know this is by feeling the upper hose gets hot when the stat opens as well as the feed hose to the heater.
Squeeze the upper hose using it as a pump of sorts to help force air to the tank.
Watch the tank for bubbles and keep it filled to the hot line as the coolant replaces the air in the system..
When it's all settled down put the cap on.
Good luck.
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