Full Floater Posted November 17, 2023 Share Posted November 17, 2023 Seems as most older Macks use a 10psi 2-5/8'' neck rad cap. Has anyone ever put a lower psi rad cap on, for reduced strain on old cooling systems? Or even a 0 pressure cap. I have done this on SEVERAL old vehicles including diesels (wet sleeved and parent bored) and have never had any negative results and very few cooling system related issues and no blow outs of things like hoses and heater cores and such....which is what im concerned about. Yes, I realize that lowering the psi also lowers the boiling point of the coolant, which is fine by me as I drive with 1 eye on the gauges and never let it get anywhere close to hot. Any thoughts? Cavitation? Hot spots? Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/73551-7psi-rad-caps/ Share on other sites More sharing options...
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