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1989 Cadillac Sedan DeVille Questions & Answers
Fuel Data Center and Electronic Climate Control not funtioning
This is defenetly the BCM, I had a 1990 with all of the same problems. Buy a rebuilt and install it behind the clove box. Remember that you must install you memory prom into the new unit as they don't come with any in them (it is what is memorizing your miles driven.) You will get off pretty easy on this one as they are available and not too expensive.
How to change the drier acumulator tank
This is not something that you should do. It requires special tools and equipment. You need to remove the Freon and capture it. Also remove the oil that is in the system. Then you check the Orifice tube and replace the part. You then put the oil back in and vacuum the air out of the system for several hours. Then you put the Freon back in.
Digital cluster not working
I had same problem with my 89 cad. deville , I changed the BCM and since then no problems and everything works great now for over a year
Need to see a video on installing in tank fuel pump
Youtube must have thousands of them, well hundreds anyway. Well, a whole lot anyway. One probably like or similar to your '89 model.
Pretty sure you have to drop the tank to replace pump. In later years, makers began putting access panels under the rear seat or trunk area to access the fuel pump assembly, without removing the gas tank.
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