Ok guys, i have a 1997 ss camaro that i replaced the waterpump on a while back, and now ive started having my bottom rad hose, passenger side, suck shut on me upon cool down process, ive changed the rad cap with one from work, ( Griffin Radiator ) and the hose thinking they could be faulty, NOT THE ANSWER! , ive inspected for blockage within the hose leading to the resrvoir as this can cause this type problem, no blocks, ive bled the system a million times, still sucks shut after driven and up to operating temps, any help would be great im pulling what hair i have left out over this one.

 

Is it possible the rubber hose from the cap/neck to the reservoir is also collapsing under vacuum, preventing the coolant from flowing up the hose? The stock hose is fairly flexible.

It's obviously allowing coolant to flow out of the reservoir as it expands and heats up, but not flowing coolant back into the radiator as it cools down and contracts.

 

Thread closed due to cross-posting.

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