I believe you are correct - the radiator is probably plugged, but you should also check the water pump.
SOURCE: 94 4.6 deville coolant hot,eng hot ,limp mode
pull codes from on board diagnostics turn key on not running press and hold hot button on temp and off at same time till dash lights up write down codes respond with all computer codes i will help you determine prodlem and try to fix
SOURCE: 1993 cadillac sedan deville security
take the fuse it is a 30 out , its near the battery happened to me this morning.good luck
SOURCE: how to reset oil life
To reset the engine oil life, do this: push info button till oil life comes up, then push inforeset, to reset to 100%
To reset the transaxle oil life do this: early models; press off and rear defrog button simultaneously.
later models; press info till the oil message shows up then, press and hold info reset.
Some models have both, but my 94 Deville only monitors the transaxle
SOURCE: 63 cadillac sedan deville heater core removal and installation instructions
I do think you have to pull he dash, for that you will need a manusl, try ebay for used factory manuals, I have had good luck getting them there for all my cars.
SOURCE: 1992 Cadillac Sedan Deville power steering leak
Replacement reservoir o-rings are available to correct the problem
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