How to flush heater core with air and wa - How-To Section - Tech Section

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Posted: Wed Dec 25th, 2019 11:08 am

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sheltonfilms
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Turns out adding compressed air to the mix gets more crud out.

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Posted: Wed Dec 25th, 2019 11:36 am

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4.0power
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Not to uproot anyone here but seems like that'd be a easy way to cause the core to leak using compressed air but then again if rust/corrosion comes out it's probably time for a new core anyways lol

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Posted: Wed Dec 25th, 2019 11:51 am

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sheltonfilms
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4.0power wrote:
Not to uproot anyone here but seems like that'd be a easy way to cause the core to leak using compressed air but then again if rust/corrosion comes out it's probably time for a new core anyways lol
I definitely see people concerned about using air. The gates commercial version of the tool says to set air pressure to 75-200 psi. I only had mine in the 40-50 PSI range. This pressure is not the pressure the core will see because it's not fully plugged. Pressure builds when there is a restriction and pressure is max when the restriction is at max. If you set a regulator to 50 psi and attached a high flow air gun to it and pull the trigger you will notice that the pressure drops like 10-15 psi or more and that's just from opening the blow gun. Also think of the heater core as a pressure vessel. When you release compressed air into a vessel it takes time to build to the set pressure. Like filling a portable air tank from an already filled tank.

A compressed air vessel will burst at it's weakest point. In this case the clog.

The high air pressure is safe on a free flowing heater core. A restricted heater core will allow higher pressure to build but will become safe after the clog is ejected.

As far as the debris coming out, it's not from the aluminum heater core but from other elements in the system. In my case I had rusty water pump impellers. Compound that with a iron block and head.

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Eddie Money

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Posted: Thu Dec 26th, 2019 08:51 am

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mhoward
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I was always afraid I would blow the radiator or heater core apart by applying compressed air. Kind of reminded me of a hydraulic ram. I just don't trust myself to NOT over-do it!

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