Thread: radiator hoses have no coolant in them when motor is cold??
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Old Feb 26, 2016 | 11:14 AM
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onehundred80
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Default Re: radiator hoses have no coolant in them when motor is cold??
Originally Posted by Sweet2002
I noticed this today. I was not too surprised when the top hose was without coolant when I popped the hood when I first went out to the car this morning but then I checked the lower and it too was "flat"? Any observation of this phenomenon? I do have the heat exchanger cutoff but for this start I opened both valves and when warm/hot the hoses were pressurized.
For the hose to flatten there is air in the system as you know. I'd say run it with all systems open until the tank will take no more coolant. It is amazing how much air gets trapped in that system.
The hoses will collapse because of the low pressure in the system, normally it would take coolant from the overflow tank to balance the pressure out, separated systems may not have access to the tank.
But you know all this.
 
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