This 1987 Cadillac Seville factory service and repair manual covers the Base Sedan 4-Door, with the specifications, wiring diagrams, and repair steps Cadillac published for this exact model year.
Engines covered
- 4.1L V8 (250 cu in) — OHV, naturally aspirated, gasoline
Body styles covered
- 4-door sedan
Trims covered
- Base
Known issues on the 1987 Seville. Two recalls are on federal record for this model year. The first covers a replacement fuel filter connector that was not manufactured to spec, so the O-ring may not seat correctly on the fuel line, creating an inadequate seal that can lead to a fuel leak and, near an ignition source, a fire. The second covers the Twilight Sentinel potentiometer, whose electrical contacts can cause an intermittent circuit that suddenly cuts the headlights and instrument panel lights, reducing driver visibility and risking a crash without warning. Owners have filed 13 complaints for this model year, and no technical service bulletins are logged. The factory diagnostic and repair procedures for both systems are included.
Whether you're tracing an intermittent headlight fault or replacing a fuel filter connector correctly, this manual keeps you on the OEM procedure and the correct specification for your 1987 Seville.
THE TWILIGHT SENTINEL POTENTIOMETER (THUMBWHEEL CONTROL) MIGHT HAVE BEEN MANUFACTURED WITH ELECTRICAL CONTACTS WHICH COULD RESULT IN AN INTERMITTENT HEADLIGHT CIRCUIT.
WITH THE TWILIGHT SENTINEL SYSTEM ON, THE INTERMITTENTCIRCUIT COULD CAUSE HEADLIGHT AND INSTRUMENT P
INSTALL A NEW PART IN ONE OF THE VEHICLES CONTROL COMPUTERS TO PREVENT THIS CONDITION FROM OCCURING.
P300 020 ; CONSUMER WAS TRAVELING ABOUT 59MPH ON A HIGHWAY AND HEARD A POOPYING NOISE. SHE WAS ABLE TO PULL OVER TO SHOULDER AND NOTICED THAT PASSENGER'S REAR BACK TIRE TREAD SEPARATED. TREAD WAS IN
THIS VEHICLE HAS A BAD HEADLIGHT SENTINEL THAT CAUSES ERRATIC OPERATION OF THE HEADLIGHTS, THEY COULD SHUT DOWN WITHOUT WARNING. DEALER HAS BEEN CONTACTED. *AK
THE PLASTIC COATING ON WINDSHIELD IS RIPPLED AND WAVY; VISION IS OBSTRUCTED, PARTICULARLY IN SUNLIGHT, AND CAR CANNOT BE DRIVEN AT NIGHT AT ALL. *AK
REAR SEAT BELTS ARE TOO SHORT. WON'T GO AROUND A 38" WAIST. *AK
ENGINE FAILED.
Showing the 5 most serious of 14 complaints filed with NHTSA.
