Question about 1989 Cadillac Seville

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1989 cadillac seville!!! cooling fan fault ???

I have had this problem for 10 years, I had to hook up a manual cooling system by conecting two wires one from the batterie two grounds going to both cooling fans wired to the cabin of the car.I would love to eleviate this problem. I have changed two coolant sensors, control fan modual, checked all wires and conectors,fans motors are working properly when i overide in dash computer diognostic and have replaced all most every thing under the hood, and thousands of dallers later ,I still have a cooling fan fault display on my computer.I dont want to bring it in for a diognostic but i may have to... And im a do it your self person

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  • Greg Bernett
    Greg Bernett May 11, 2010

    Yeah....what a bummer...but, like you, I would take it in.....especially if you have done all that! No suggestions, soory.



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I have one of these cars that had that problem. I fixed mine with a new fan control module. The fan wires can be hooked up backwards to the module when you replace it too. I have a service manual on this car and can answer most questions as I have helped a lot of people with this year model. I will look at which fan should be pluged into where later. You should never straight wire a cooling fan as this will result in other problems because the engine will not come up to normal temperature resulting in poor fuel mileage. This could result in a exhaust converter and o2 sensor failure due to a rich fuel mixture. Reply and I will get back to you asap.

Posted on Jul 01, 2009


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1 Answer

I have 91 cadillac seville that keeps overheating

have you changed the thermostat, check the rad cooling fan operation, checked coolant circulation, check for coolant leak, checked for head gasket problem, checked for a restriction in the cooling system. you don`t say what if anything you have done to eliminate a cause.

Aug 20, 2015 | 1991 Cadillac Seville

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No air flow for heat and A/C

It would be unlikely that a heater core - a/c blower would be running or supposed to run a 30amp fuse, a 10 amp would be sufficient for that curcuit, or it could overheat the wiring in a fault.

Trace the wiring back, check for power from the fuse and trace it down to the fan, to check the fan run power into it and see if it operates.

Check the fan resistor.

Feb 26, 2018 | 2002 Cadillac Seville

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Hey, my 1989 cadillac seville has te codes: b120, b121, b122, b441, b552. What do these mean?

b120 121 & 122 are a twilight delay & panel dimming codes. Probably a problem with the switch. b 441 is a cooling fans problem. b 552 is caused when the battery cables have been disconnected or power loss to the ECM. Keep alive memory error.

Aug 29, 2011 | 1991 Cadillac Seville

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I have a 1989 Cadillac Seville. I've had the car for 6 years. The other day my DIC told me "Engine Hot AC Compressor Off" In the entire 6 years of owning this vehicle the A/C has never worked,...

251 degrees is way too hot-so it's basics time, how long has it been since you have replaced the thermostat, or changed the antifreeze? At that temp, you could do major damage to the heads, head gasket and even the engine, so you really want to have the entire cooling system gone over-you coolant fan may be failing, or an engine control (like a relay for the cooling fans, even the engine computer)-it should be gone over sooner than later since overheating is the worst thing you can do to an engine.

Mar 14, 2011 | 1989 Cadillac Seville

1 Answer

1993 cadillac seville sts 4.6 litre keeps heating up not the thermostat what else could it be?

It can be that the cooling fans are not coming on from air in the cooling system,or a bad coolant sensor or cooling fan relay,or a bad water pump,or radiator.

Aug 21, 2010 | Cadillac Seville Cars & Trucks

1 Answer

DIC displays "cooling fan fault". I know it could be the fan, but also i know it coudl be the wiring on the fan, and or the fuse that works it may be out...there fore im looking for the driagram to show...

I would use a 'fuse tester' that will light up if the ignition is on and the fuse is bad, while installed in the fuse block.

Otherwise, you can individually pull out each fuse and look at each one physically to see if there is a blown one.

Sometimes, there are 'fusible links' which come off of the starter which are multi colored and will 'stretch' when pulled on with about 5 lbs. of pulling force. When you find a 'stretchy' wire near the starter, it means the fusible link blew on it (like a fuse would blow).

If the DIC says cooling fan fault, it detected an open in the system somewhere.

Aug 13, 2010 | 1989 Cadillac Seville

3 Answers

98 cadillac seville 4.6 overheating

are your fans or fan working if not it will get hot. I assume you have electric fans or fan if so make sure when it starts to overheat the fan or fans come on if not check the fuse for the fans or relay, breaker, wiring itself.

Sep 03, 2009 | 1998 Cadillac Seville

1 Answer

Vacume diagram for a 1989 cadillac seville that shows where the vacume reservior is located

Its under the battery, you can see it from underneath car. What is wrong with car? I have a service manual.

Apr 25, 2009 | 1989 Cadillac Seville

1 Answer

My 95 cadillac sevile sls is overheating. radiator

check cooling fan sensor,which tell the fans to come on

Apr 16, 2009 | 1995 Cadillac Seville

3 Answers

Cooling fan fault on 1989 Cadillac Seville

Replace coolant fan module. Its underneath the hood lock. It fixed mine. Be sure to hook up the fans correctly because you can get them mixed up. Never wire the fans up where they will run all of the time. The car will use more fuel and it will not heat up quickly, this will damage oxygen sensor. Also the ac will not work right as all of this is controlled through the BCM.

Mar 12, 2009 | 1989 Cadillac Seville

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