1993 Cadillac DeVille Owner's Manual - Page 256

1993 Cadillac DeVille Manual

Page 256 highlights

How to AddCoolant to the Radiator 1. You can remove the radiator pressure cap when the cooling system, including the radiator pressure cap and upper radiator hose, is no longer hot. Turn the pressure cap slowly to theleft until it first stops. (Don't press down while turning the pressure cap.) If you hear ahiss, wait for that to stop. hiss means there is still some A pressure left. 2. Then keep turning the pressure cap, but now push down as you turn it. Remove the pressure cap. 1 i 243

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