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: heater blower install for 1997 cadillac eldorado
The solution is more than likely a new blower motor. Replacing this blower motor is no small task. I am in the process of doing it, but there is so little wiggle room that I suspect that if a cadillac mechanic does this job, they will jack up the engine/transaxle to make room. The motor itself is not cheap either, a replacement Delco is well over $200. I will let you know if my new motor install works.
SOURCE: 1999 cadillac deville air wont work
There's a blower motor (fan) under the hood and up against the firewall near the center of the car that takes some work to remove. It has gone out in the last 2 of my 4 Cadillacs. Turns out if you're not real careful with the positioning of the spark plug wires they will brush up against it, and if one of them gets cracked or brittle it will "arc" and short out the blower motor. The a/c compressor should still come on (you'll hear a click when it engages) but you won't get any air blowing into the cabin, hot or cold.
The part was like $200 stock (year 2000 prices) and it took about an hour to remove it. My Caddy at that time had this damn strut bar going across the engine bay which we eventually removed to get to the blower motor.
SOURCE: 1999 Cadillac Deville Heater Blower motor has
make a jumper cable up from lamp cord (from any Hardware store) and power up the blower motor from the battery
SOURCE: how to replace heater core
well the dash will have to be removed from the car perhaps take the car to a certified shop for repair.This is a big job even for a pro 5-6 hours???
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