1996 Cadillac Deville Problems

What owners report

Owners of this model year most often describe fuel leaks and gasoline odors traced to the plastic fuel rail tubing and lines, power steering that drops out in wet weather, and coolant loss leading to head gasket repairs. Complaints cluster between roughly 25,000 and 115,000 miles on the fuel and steering items, while brake reports tend to arrive at higher mileage.

1. 1
   Fuel system

   Fuel leak and gasoline smell from fuel rail lines

   Mentioned in 22 of 60 sampled complaints

   Complaints describe a strong gasoline smell inside the cabin or at the vents, sometimes with fuel visibly spraying or dripping near the fuel rail or the plastic lines feeding it. Several owners say the tubing cracked with age and that only part of the assembly was replaced, with the smell or leak returning afterward. A few reports describe the fuel pump losing pressure and the engine stalling, and some note dealers had trouble getting parts or declined to reimburse earlier repairs. Mostly reported between about 25,000 and 160,000 miles, often noticed at startup, during fueling, or as a smell in the cabin while driving.

   Recall 04V110000

   What to check: Ask whether recall 04V110000 was performed and exactly which parts were replaced, then look and smell around the fuel rail and the plastic lines with the engine running.

   2 excerpts from owner complaints in NHTSA records

   “One day I could smell gas fairly strong, and then I stopped at a friends shop, opened the hood and you could see gas spurting out. As I was looking up this part and then spoke with someone that informed me that yes there had been a recall on the fuel rail and that it was closed. Of course I had to park it to keep it from catching on fire.. It's a 1996 Cadillac Deville and it's in mint condition. I am asking for some help in getting this repaired/replaced.”

   NHTSA complaint #11164233, filed 2018-12, 250,000 miles

   “Injector ( plastic) gas lines were spraying vaporized gas over the engine. Why this didn't ignite is beyond belief! Our certified Cadillac mechanic said that most cars have metal gas lines not plastic. The plastic hoses are molded into the fuel injection system so when they crack with age, they have to replace the whole system not just the plastic lines. How would anyone know that this is a problem - only because the fumes became more intense did I take it in. …”

   NHTSA complaint #10021485, filed 2003-06, 79,000 miles
2. 2
   Steering

   Power steering drops out in rain or when wet

   • 48 complaints (22%)
   • median 66,500 mi at 7.5 yrs old (4 state mileage, few)
   • 1 mention a crash, fire or injury
   • filed 1996–2008

   Owners describe the steering suddenly becoming very heavy or the wheel feeling locked, typically while driving through rain or splashing through a puddle, and sometimes it returns to normal on its own. Several say a dealer blamed the serpentine belt getting wet and slipping; one owner reports a belt tensioner was replaced without fixing it, and others describe pump replacement or a broken casting. Reported across a broad mileage range, often from about 60,000 to 100,000 miles, and in several complaints specifically during rainy conditions.

   What to check: Inspect the belt and tensioner for glazing or looseness and ask whether the pump or belt has been replaced; a wet-weather test drive is worth attempting if possible.

   2 excerpts from owner complaints in NHTSA records

   “Front wheels passed through a puddle and water splashed into engine compartment while I attempted to make a turn. There was a complete loss of power steering and the turn could not be completed. The effect was momentary but scared me quite a bit. This has happened three times on different rainy days with the car.”

   NHTSA complaint #10250966, filed 2008-12, 70,000 miles

   “1996 Cadillac concours Deville. 1. Events leading to failure: power steering fails during rain events. 2. Failure & consequences: unable to safely steer vehicle. 3. Belt tensioner replaced; did not correct the problem.”

   NHTSA complaint #10186276, filed 2007-03, 63,000 miles
3. 3
   Vehicle speed control

   Engine races or accelerates on its own

   • 17 complaints (8%)
   • median 90,201 mi at 9.0 yrs old (7 state mileage, few)
   • filed 1996–2010

   Owners describe the engine speeding up without accelerator input, sometimes with the A/C cutting out as rpm rise, and in some cases the car pushing forward at a stop light. Several say restarting clears it temporarily before it returns unpredictably, and a few report the dealer could not reproduce the fault or attributed it to a computer chip. Reported from about 38,000 to 180,000 miles, usually intermittent and without warning.

   What to check: Ask whether the throttle body or engine control module has been serviced, and watch the idle in park and at stop lights for surging.

   2 excerpts from owner complaints in NHTSA records

   “On a 3000 cross country trip the car accelerates uncontrollably while turning the A/C off, giving it more horsepower. I originally thought it was a cruise control problem until I discovered that the car will idle beteen 3000 and 4000 RPM when this condition exists. I have seen it accelerte through 80mph. Turning the car off then recranking it causes the problem to go away temporarily. The local Cadillac dealer has refused to repair it or even diagonse the problem. …”

   NHTSA complaint #10078467, filed 2004-06, 180,000 miles

   “My 1996 Cadillac Deville concourse has developed a defect whereas it will accelerate on it's own, shutting down the A/C for more horsepower while it does it. I have seen it accelerate through 80 MPH once. The condition goes away temporaily when the engine is shut off and recranked, returning at unpredictable intervals. My local Cadillac dealer refused to repair the problem, giving me a go away and never come back speech advising me strongly to junk the car (it's in almost perfect condition otherwise). …”

   NHTSA complaint #10078413, filed 2004-06, 180,000 miles
4. 4
   Engine cooling

   Coolant loss, overheating and head gasket repairs

   • 14 complaints (6%)
   • median 85,575 mi at 12.8 yrs old (7 state mileage, few)
   • 1 mention a crash, fire or injury
   • filed 2000–2012

   Complaints describe having to refill coolant repeatedly, coolant mixing with the oil, and the engine running hot soon after startup, with shops diagnosing a blown head gasket or a cracked block. Owners report the repair requiring engine removal and costing several thousand dollars, and several note it happened on a well-maintained car. One owner describes coolant entering the cabin through a failed heater core. Reported from about 17,000 up to 160,000 miles, with several cases under 90,000 miles.

   2 related service bulletins

   What to check: Check the coolant level and color, look for a milky residue under the oil cap, and ask whether the head gaskets or intake gaskets have been replaced and whether a coolant pressure test was done.

   2 excerpts from owner complaints in NHTSA records

   “My father purchased a 1996 sedan Deville brand new. He passed away in april 1998. My mother drove the car until this year. She gave me the car. The car has approx 17,000 miles. I just found out the car has a blown rear head gasket. I realize the car is 15 yrs old but I feel this should not have happened with such low mileage. The car was never abused and still smells new inside. Do I have any recourse with GM?”

   NHTSA complaint #10396042, filed 2011-04, 17,000 miles

   “Loss of engine coolant on my 1996 Cadillac Deville. Took car into dealer and they diagnosed blown head gaskets. Repair called for engine removal and cost approx. $3400. I have heard of a number of other GM northstar engines having this same type of failure. My car has been dealer maintained since new and with only 85,000 miles on this car and the number of other similar failures reported, I consider this a manufacturers design fault.”

   NHTSA complaint #10109827, filed 2005-02, 85,575 miles

Buying note. Before buying, have a shop check the fuel rail and lines for leaks and confirm whether recall 04V110000 was completed, and check coolant and oil for signs of head gasket trouble. It is also worth confirming normal power steering assist in wet conditions and asking for brake service records.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.