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Kirk Morgan · 04-17-2019, 07:06 AM

If your cooling system is working properly the system will go from positive pressure to negative pressure as the coolant expands and contracts from temperature. Your problem could be as simple as a defective radiator cap or the wrong radiator cap. If you have the factory by pass hose i cannot see how you would get a air lock.

04-17-2019, 07:06 AM	#11
Kirk Morgan Member Join Date: Jan 2009 Posts: 230 Likes: 1 Liked 81 Times in 45 Posts	Re: Radiator under constant pressure? If your cooling system is working properly the system will go from positive pressure to negative pressure as the coolant expands and contracts from temperature. Your problem could be as simple as a defective radiator cap or the wrong radiator cap. If you have the factory by pass hose i cannot see how you would get a air lock.