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Test pressure for C2 heater core

Old 12-06-2018, 06:01 PM
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Nalrops
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Default Test pressure for C2 heater core

i searched a few other posts but couldn't find a specific test pressure. I'm wanting to go higher than the 13# cap pressure. Testing my heater core before I put it back in, tearing it out once is enough.

does anyone know what the maximum test pressure is, or perhaps a pressure higher than 13# that won't exceed what it can tolerate? Wanting to take it higher than 13# to be sure there are no leaks.

thanks guys,
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Old 12-06-2018, 06:13 PM
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Nowhere Man
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big block cars used the same core and they had a 15 PSI cap
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Old 12-07-2018, 01:10 AM
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Dave Tracy
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I just replaced my heater core while rebuilding my a/c//heater box. I had a new core checked and it leaked, the 2nd one was bent and the 3rd was satisfactory. The radiator shop checked the cores with 20 lbs air pressure. Also had additional solder placed around the inlet and outlet fittings
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Old 12-07-2018, 01:19 AM
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Thanks Dave. I can test, I just don't want to over pressurize so good to that 20 psig is what a radiator shop would test at.

thanks again
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Old 12-07-2018, 03:59 AM
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Westlotorn
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I know that some have used a water hose to test without thinking about the fact that a water hose can have 45-75 PSI and they blow out a good core.
The system will never see more than 15 PSI cap limited so why expose it to any higher pressure as a test. I would think 20 PSI as mentioned is a good Maximum test pressure.
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