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Redthunder
New User
Nov 3, 2006, 11:55 AM
Post #1 of 7
(1826 views)
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I have an 87 Ford Mustang 5.0 that keeps pushing the antifreeze out. Only happens when you really get on it. Never gets hot and if you drive it conservative it's fine. The instant you stand on it the antifreeze will poor out of the over flow. I have replaced the head gasket and manifold gasket thinking that was the problem but it didn't work. Mechanic has been messing with it for a week and told me to pick it up because he can not find any problems? The heads have been plained and they did not notice any cracks when they replaced the head gasket.
Anyone have any idea's?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 3, 2006, 12:27 PM
Post #2 of 7
(1823 views)
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Cooling system should be pressure tested and radiator cap must be working properly too and a new one wouldn't hurt, T
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Redthunder
New User
Nov 3, 2006, 12:56 PM
Post #3 of 7
(1822 views)
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We did put a new 16lb cap on the radiator and a pressure test was done, also checked for exhaust, didn't detect anything. They said they couldn't find a crack in the heads but I am begining to think thats what it is?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 3, 2006, 6:28 PM
Post #4 of 7
(1815 views)
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From here I would test for exhaust gasses in the cooling system right after this happens. That would prove that a gasket or crack is at fault.
One more -- if there is no spring in the lower radiator it could be collapsing under high rpm and the water pump is overwhelming the pressure of the cap.
That comes from my school days and I never had a problem with regular cars but always check that they have them. I used to keep a couple as some hoses don't come with them and could only find them in junkyards. Squeeze that hose and see if it's there, if not put one in. They don't come in all original hoses or aftermarket either. So many times I pulled the old one out and put it in the new one They did use them for a reason. That just may be it! T
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Redthunder
New User
Nov 19, 2006, 3:39 PM
Post #5 of 7
(1793 views)
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Well I have done a lot more testing on the car. Replaced the radiator cap (no help), checked the radiator for exhaust (non found), pulled the plugs out to check for any water (non found), No smoke out the back of the car when started or running, let it idle for 2 hours to see if it got hot and it didn't. The shop I have been taking it to has given up on it and doesn't want to go further. They really don't know what is wrong with it, they want to tear it down and replace the heads but don't really know if that is the problem? I would hate to rack up another $1,000 in replacing the heads and that not help, any other idea's?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 19, 2006, 4:03 PM
Post #6 of 7
(1791 views)
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It's been a while but the upper intake or plenum involves antifreeze. That just a shot in the dark as a possibility which has never happened to me, T
PS: If throwing parts start with the cheap stuff..........
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Redthunder
New User
Nov 27, 2006, 7:38 PM
Post #7 of 7
(1773 views)
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Crazy but I think I fixed the problem! I parked the car so the front end was up hill, took the radiator cap off while it was running and turned the heat on. I ended up adding over a gallon of anti freeze after I thought it was full. It was very foamy when I started adding (air was in the system) and by the time I had all the fluid in the foam had disolved. Appears that the problem was a very large air pocket in the system! After 2 months of messing around and countless $'s I think I pinned it down. Thanks for the thoughts.
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