2

I'm stumped, it doesn't effect the car and no overheating or mechanical issues. Lower one is pressurized but not the top? 06 Impala police package. Do the police versions have bigger radiators and coolers?

  • How do you know the upper radiator hose doesn't carry higher-than-ambient pressures? Have you measured it? Similarly, is there are repair/maintenance question here? Does it concern you that you believe it's unpressurized? – Hari Ganti Mar 16 '17 at 2:30
  • Well, I did pressure test the coolant system with same results. No pressure. – Noah Mar 16 '17 at 2:32
  • How are you testing for pressure in the upper radiator hose? – Hari Ganti Mar 16 '17 at 2:34
  • Attaching the pressure tester to the radiator neck and pressurizing the system. Hose isn't leaking or in bad shape. (No store sells these hoses as they are police package) The upper one goes directly into the engine so I'm guessing it carries the coolant into the engine and lower one circulates it – Noah Mar 16 '17 at 2:37
  • If you are only reading pressure at the radiator cap, then you aren't necessarily reading the pressure of the upper radiator hose. I ask because I actually can't think of a convenient way to specifically measure it. Also, you have it backward. The upper radiator hose received hot coolant from the engine and feeds the radiator. If the upper hose feels warm after driving, it's doing its job. Also, I don't really see how this is a maintenance/repair question, so I am voting to close as off-topic. – Hari Ganti Mar 16 '17 at 2:42

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