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if u havent fixed it by now usually it the fan module behind the front left headlight to acess remoce the coolant resivor and the left side turn signl marker their are 2 7mm screw and connectors on each end but u have to remove the sensor input signal wire to se if the fans come on 1st part of the diag do not replace the bcm til u checkl it out 1st usually it is the fan maoule at fault not bcm
I also have a 1995 Deville 4.9L with the same shut down problem. I replaced the ignition module, with no effect on the problem. So, I took it into a Cadillac Dealer who said it was the "hall effect switch" and lower wiring both of which are on the under side of the distributor. To get to this switch, you need to pull out the distributor assembly. If you do this, you have to make sure you mark the position of the gears.. otherwise you will screw up the timing. I didn't want to sink any more $'s into the car, so I sold it for $2K. Hope you have better luck. Zak