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| Josh | What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Guru
 
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I pressurized the cooling system in my 91 with a coolant system tester. The system dropped from 19 PSI to 12 PSI in one hour. There are no visible leaks. Should I be worried about an internal leak?
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Posted on: 2010/5/19 4:33
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"Have ya paid your dues, Jack?" "Yessir, the check is in the mail." - Jack Burton |
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| Fluff | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Senior Guru
 
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Hi Josh,
I don't know the answer (still working on my own ac problem), but Dan directed me to a site with loads of info and a forum with plenty of FAQ's. Perhaps it might help http://www.ackits.com |
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Posted on: 2010/5/19 14:10
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93 LT1 Coupe. |
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| Vetron87 | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Elite Guru
 
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Quote:
As coolant absorbs heat from the engine it expands the coolant thus causing pressure. As the coolant cools pressure will drop. This cooling process has variables: outside temp, humidity, and efficiency of the cooling system The boiling point of the coolant is lowered by pressurizing the system by heating and circulation via the water pump. Hope this helps! I think your OK! with no visible signs of leaks or smell of coolant. |
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Posted on: 2010/5/19 14:25
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Bone stock 87 conv. |
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| BillH | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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The Stig Moderator
 
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Generally with the testors, you're looking for a couple psi drop in like 5 min.
If your car had been run at all before the test, the drop in one hour is possible (like Ron said). |
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Posted on: 2010/5/19 14:43
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Every man dies but not every man lives. |
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| Josh | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Guru
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The car was stone cold. It had sat overnight, so the temperature of the coolant didn't change throughout the test.
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Posted on: 2010/5/19 14:49
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| Vetron87 | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Elite Guru
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Quote:
If you have a standard 16psi cap and you pump 19 psi your going to loose psi when cap opens to relieve pressure into the overflow tank. 12 psi is normal for that lenght of time. My tester will relieve pressure @ 14psi |
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Posted on: 2010/5/19 14:53
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Bone stock 87 conv. |
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| CentralCoaster | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Senior Guru
 
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Doesn't sound right to me. I'd try again but not start above the cap rating.
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Posted on: 2010/5/20 3:11
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| LT4BUD | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Quote:
FWIW the instructions that came with my Stant tester specify a two minute evaluation period.... |
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Posted on: 2010/5/20 18:47
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| Josh | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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I put the tester on my daily driver and the same thing happened. For the time being I'm going to treat it as normal.
I left the tester on it over night, and after 24 hours the system still had 6 PSI in it. |
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Posted on: 2010/5/21 2:15
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| vis_croceus | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Senior Guru
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Isn't the cap sitting on the garage floor during the test? |
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Posted on: 2010/5/22 19:22
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| Josh | Re: What is an acceptable rate of pressure drop when testing the cooling system? | ||
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Quote:
Yes. |
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Posted on: 2010/5/24 5:26
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