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Air vents leaking glycol
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- Check the glycol concentration with a refractometer. Adding water can dilute it, reducing boiling point. Top up to proper concentration if needed.
- Inspect the cap and seal on venting valves. Tighten cap or replace valve if worn out and not sealing properly.
- Make sure the system pressure does not exceed the vent’s pressure rating, causing glycol to leak out. Lower pressure if over.
- Check that air vents are installed properly at system high points. Move to higher locations if placed incorrectly.
- Look for loose pipe connections allowing glycol seepage. Tighten fittings or replace leaky gaskets or seals.
- Flush the system to remove sediment buildup that could be holding open automatic air vent valves internally.
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