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: I need the firing order on a 1996 Cadillac Sedan Deville
Firing order 1-2-7-3-4-5-6-8 ..............1-3-5-7 back of engine near fire wall...........2-4-6-8 front of near radiator
SOURCE: Firing diagram for 1990 caddy sedan deville front wheel 4.5?
To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only
one orientation, it could have been removed previously and rewired. The
resultant wiring would hold the correct firing order, but could change
the relative placement of the plug towers in relation to the engine.
For this reason it is imperative that you label all wires before
disconnecting any of them. Also, before removal, compare the current
wiring with the accompanying illustrations. If the current wiring does
not match, make notes in your book to reflect how your engine is wired.
4.5L and 4.9L EnginesEngine Firing Order: 1-8-4-3-6-5-7-2 Distributor Rotation: Counterclockwise
Hope helped with this (remember rated this help) Good luck.
SOURCE: fuse box diagram picture for 1990 cadillac deville
your best bet is to go to your choice of auto repair store and purchase a Haynes Repair Manual for GM it covers the Cadi, Olds Toranado and the Buick Rivi 86-92, its located in the back section of the book youll have no problem locating it.
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