Question about 1988 Cadillac Sedan DeVille

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88 Cadillac Deville cooling fan runs continuously

I own a 1988 Cadillac Deville that other wise runs great. My wife came home from work one night and parked it as usual but when she turned off the car she heard the engine cooling fans continue to run. We live in Wisconsin and it very cold out side so she thought it would quit as the engine cooled off. That is not normal for the fans to run when ever I turned off the car in cold weather. So later she went to start the car to run an errand and the battery which was bought new on 01/16/09 was completly dead. I put a battery charger on the battery and found that the fan ran as soon as the power was applied. Whats going on?

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I have a 1990 Cadillac Fleetwood and the cooling fans will not shut off....what is the problem?

Posted on May 29, 2009

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You have a bad fan swtich in the block or the therostat housing its an easy fix

Posted on Jan 26, 2009

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1 Answer

Engine fans run after car is shut off


it will do it will keep going till engine cools its surposed to do this it will shut when its cool , if it still does it after its cool then u need to replace temp sencor it on side of rad

Nov 08, 2013 | 1988 Cadillac Sedan DeVille

1 Answer

I hav a Cadillac deville running hot what too do


how long has it been since the thermostat has been changed.is the cooling fans working at the radiator if not you could have a bad fan motor or a cooling fan relay.it could even be a bad sensor that the computer monitors to turn on and off the cooling fan.this is a different sensor than the one that works the coolant gage or light on the dash.

Feb 09, 2012 | 1996 Cadillac DeVille

1 Answer

My cadi 1988 is running ruff and quit running feels like over heating but no leaks, just smells


REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.MAKE SURE COOLANT NOT LOW.IF ALL IS GOOD CHECK FOR LEAKING WATER PUMP WEEP HOLE IF LEAKING REPLACE WATER PUMP.MAKE SURE COOLING FANS RUNNING.IF ENGINE RUNNING HOT WHILE SITTING LONG TRAFFIC LINE AND COOLANT NOT RUNNING.CHECK COOLANT FAN RELAYS AND FUSE.IF ALL IS GOOD HOT WIRE MAKE SURE COOLING FAN MOTOR GOOD IF COOLING FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD.IF FAN MOTOR OKAY AND FUSE RELAYS GOOD YOU HAVE FAULTY COOLING FAN WIRING.YOU COULD HAVE BAD ENGINE COOLANT SENSOR OR FAULT IN ECM CODE SCAN TO CHECK THEM BOTH.CHECK ENGINE OIL.LOOK LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF OIL LOOKS OKAY.YOUR ENGINE BLOCK, RADIATOR AND HEATER CORE NEED FLUSHING.

Sep 20, 2011 | 1988 Cadillac Sedan DeVille

1 Answer

Parking lights and tail lights will not work, turn lights work, brake lights work and head lights work.


CHECK THE FUSE LOCATED ON LOWER PART OF INSTRUMENT ON DRIVER SIDE BETWEEN S/W AND DOOR

Aug 21, 2010 | 1988 Cadillac Sedan DeVille

1 Answer

Can I program the automatic headlights to always shut off when the ignition is shut off - day or night?


I have a 1997 cadillac deville that has both 'daytime running lamps' when put into gear and 'twilight sentinel' which turns the headlamps and parking lamps on at night, and goes off during the day or when it is bright enough.

There is an adjustable delay for the twilight sentinel to turn the headlights off after the ignition key is removed and it is night time.
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I had the 'daytime running lamps' installed on a 1990 Cadillac Deville that turns the headlamps only on when the ignition key is switched to on with an aftermarket module. The headlamps are about 70% or so as bright as the regular twiilight sentinel headlamps and parking lights and are designed to go on during the day.

The twilight sentinel overrides this feature when it gets dark outside.

I had the daytime running lamps installed by an auto electric shop that specializes in electrical systems, alarms, stereos, etc.

Does this help?

Jul 10, 2010 | 1998 Buick LeSabre

1 Answer

Car is stuck in park. Wife drove home last night


TRansmission went on the car you may have to buy a new transmission

Mar 19, 2010 | 2001 Pontiac Grand Am SE

2 Answers

88 deville wont shift into 3rd gear,im wondering if it is the pressure switch.


Possibly in a "Safe" or "Limp home" mode. If so, have a look at the wiring harness on the transmission. I'll bet that the seal around the lid on it is failing. Clean the harness up, and reseal the lid on. If this does not fix it, have a mechanic look at the shifter linkage.

Jan 07, 2010 | 1988 Cadillac Sedan DeVille

1 Answer

1988 sedan deville cadillac runs good until


Sounds like the battery is weak or the alternator isn't providing enough amps to keep the engine running and power the lights at the same time.

Dec 04, 2009 | 1988 Cadillac Sedan DeVille

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