Hello,
Tested my SCA's(supplemental coolant additives) in the coolant at the radiator petcock drain and they are a little low. Bought the pint size bottle of concentrated DCA that was recommended by Cummins to add to bring the levels back where they should be. Per Cummins add straight in to the radiator. Problem is I can't see a radiator cap directly on the radiator. Only way I can see to add is through the coolant resevoir. Anybody know if there is a cap on the radiator itself. Took the back engine hatch off from inside and got a mirror to shine in up around the housing but still didn't see a radiator cap. Had to stand on my head to see as much as I did.
Guess I'll just add it to the resevior unless someone can point me in the right direction.
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04 HR Ambassador 38 PDQ ISC 330 Cummins,
2016 Chevy Colorado crew cab Z71
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