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Old 08-27-2017, 07:41 PM   #1
Carmine

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Default Puking out the overflow hose

Hi everyone. What makes a car puke out antifreeze through the overflow hose?? I had my '71 GTO out today for a 40 minute ride. Ran well. Temp. stayed pretty much at 190-195. Shut the car off to get ice cream and a few minutes later, the overflow hose was puking out antifreeze. Loss maybe a quart of antifreeze if that. A few days ago on a previous ride, the day was even hotter and I had a longer ride. Car temp. ran about the same. Drove the car home and shut it off. Nothing on the floor overnight. I did notice previously that the radiator was quite full. Have to wonder why it did it today, and under almost identical circumstances, it didn't do it last week. Any ideas/suggestions would be appreciated. Thank you, Carmine.
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Old 08-27-2017, 07:49 PM   #2
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several possible causes. 1 being a weak rad cap. I use a 16# cap on cross flow radiators. 2 you need a recovery tank to catch vented fluids and allow them to be sucked back in.
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Old 08-27-2017, 07:49 PM   #3
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check the cap sounds like its getting weak.
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Old 08-27-2017, 07:55 PM   #4
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Thanks guys. The cap is brand new but that doesn't mean it isn't defective. I can buy another one if need be. It's rated at 15lbs. which I believe is factory, Carmine.
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Old 08-27-2017, 07:59 PM   #5
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Quote:
Originally Posted by Carmine View Post
Thanks guys. The cap is brand new but that doesn't mean it isn't defective. I can buy another one if need be. It's rated at 15lbs. which I believe is factory, Carmine.
If your car didn't originally have an overflow tank then the radiator had a "full cold" line on the tank about 3" down from the top so it wouldn't puke out. If you are filling it to the top that is your problem, Let it seek its level and you should be good to go.
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Old 08-27-2017, 08:10 PM   #6
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If your car didn't originally have an overflow tank then the radiator had a "full cold" line on the tank about 3" down from the top so it wouldn't puke out. If you are filling it to the top that is your problem, Let it seek its level and you should be good to go.
No original overflow tank to my knowledge. I do believe it was pretty full. Don't know how that happened because I like it to be down some from the top. I will check it in the morning to see how far down it is. Guess I will leave it at that level and see what happens. Thanks Bruce. See you Friday, Carmine.
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Old 08-27-2017, 08:27 PM   #7
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No original overflow tank to my knowledge. I do believe it was pretty full. Don't know how that happened because I like it to be down some from the top. I will check it in the morning to see how far down it is. Guess I will leave it at that level and see what happens. Thanks Bruce. See you Friday, Carmine.
Sounds good, We will be in our usual spot.
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Old 08-27-2017, 09:25 PM   #8
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Quote:
Originally Posted by TheHotrodHandyman View Post
If your car didn't originally have an overflow tank then the radiator had a "full cold" line on the tank about 3" down from the top so it wouldn't puke out. If you are filling it to the top that is your problem, Let it seek its level and you should be good to go.
Exactly, hot water expands, you had it filled too much. Installing a over flow tank does help some, with a over flow tank you purposely fill the radiator to the vary top, must touch the radiator cap cold, then it will expand into the overflow and get sucked back in as it cools.
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Old 08-28-2017, 08:10 AM   #9
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Sounds like you are filling the radiator to the top when cold. You need to leave space for expansion. Most likely you will be at the correct fill after the puke
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Old 08-28-2017, 09:06 AM   #10
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Installing an overflow tank on any car is easy, and would be the best solution. It will keep the air out of your radiator, and full to the top all the time, and not make a mess. Plus you can visually see your coolant level in the recovery tank without needing to remove the radiator cap all the time to check. If it never had a tank originally, it should have.
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