1993 Buick Regal Owner's Manual - Page 199
1993 Buick Regal Manual
Page 199 highlights
7 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...-, x 8 ir How to Add Coolant to the Radiator Turn the pressure cap slowlyto the left until it first stops. (Don't press down while turning the pressure cap.) If you heal- a hiss, wait for that to stop. A hiss means there is still some pressure left. 197
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