1990 Mercury Cougar Problems

What owners report

Owners of this model year most often describe electrical trouble — engine-bay fires, ignition switch failures after the recall work, and dash lights and instruments going dead — along with sudden unintended acceleration complaints tied to the throttle linkage. A second cluster involves the motorized automatic shoulder belts failing to latch, retract or move, and 3.8L head gasket failures that show up as overheating. Reports span from low-mileage cars to ones past 200,000 miles, so condition appears to matter more than age alone.

1. 1
   Electrical system

   Engine-bay and ignition-switch electrical fires

   • 8 complaints (9%)
   • median 75,400 mi at 26.1 yrs old (2 state mileage, few)
   • 5 mention a crash, fire or injury
   • filed 1997–2017

   Complaints describe smoke and flames from under the hood or at the firewall, sometimes while the car is parked with the ignition off and shortly after it was driven. Several owners link the trouble to the ignition switch, including one who says the recalled switch was replaced and the starting trouble or failure returned. Others describe alternator or fuse-box area fires that destroyed the vehicle. Some mention a burning smell, an electrical shock when touching underhood parts, or repeated ignition switch replacement. Reported across a wide mileage range, from roughly 60,000 to 89,000 miles in the complaints that list mileage, and often after the car had been driven and then shut off.

   Recall 96V071000

   What to check: Ask whether recall 96V071000 (ignition switch) was completed and whether the switch has been replaced more than once since. Look for scorched wiring or a burnt smell around the ignition switch, fuse box and alternator.

   2 excerpts from owner complaints in NHTSA records

   “After starting vehicle flickering on off of dash lights,panel completely out and now will not come back on,creating an issue driving,unable to see speed,milage gas usage,when checking under hood I was given an electrical shock,the motor was running,immediately turned off motor”

   NHTSA complaint #11024160, filed 2017-09, 61,800 miles

   “Two years ago the consumer received a recall letter NHTSA # 96v071000. Dealer replaced the ignition switch. One year later the recalled component failed and this time an independent shop replaced the ignition switch. Once again the ignition switch needs to be replaced. The dealer has been notified.”

   NHTSA complaint #10080252, filed 2004-07
2. 2
   Seat belts

   Automatic shoulder belt won't latch or move

   • 13 complaints (15%)
   • median 235,000 mi at 28.7 yrs old (1 states mileage, few)
   • 1 mention a crash, fire or injury
   • filed 1995–2018

   Complaints describe the motorized front shoulder belt stuck in the down position, not retracting, hanging loose, or failing to hold an occupant, and some say the manual lap portion does not work either. Owners report the track or motor as the cause and note that the belt can be unusable when the door does not close or latch properly. Dealers are described as removing debris from the track or not resolving the problem. Reported on cars of varying age, with no mileage given in most of these complaints.

   What to check: Buckle and unbuckle both front belts and run the shoulder belt through its full travel with the door open and closed; check that the belt locks when pulled sharply and that the lap buckle holds.

   2 excerpts from owner complaints in NHTSA records

   “I just want to know who I can take it to repair the front seat belt. Its the manual lap part that is not working properly. I would greatly appreciate your help. Thanks for your time and attention.”

   NHTSA complaint #720218, filed 2000-03

   “Getting into vehicle, no lever to close from inside. Dropped off hinges that were worn & out of alignment. Automatic shoulder belts do not activate due to door not being able to close. Have to hold it close. At dealership now.”

   NHTSA complaint #818878, filed 1997-10
3. 3
   Vehicle speed control

   Sudden acceleration / throttle sticking

   • 11 complaints (13%)
   • typically at 6.8 yrs old
   • 4 mention a crash, fire or injury
   • filed 1995–2000

   Owners describe the accelerator dropping to the floor or the engine revving on its own, sometimes with cruise control off and at highway speed, and brakes that did not bring the car to a stop. In several accounts the only way to slow down was shutting off the engine. Dealers are reported to have replaced the throttle control valve and cleaned the throttle body, or to have been unable to duplicate the problem. Reported at highway speeds around 60-65 mph as well as at 30-40 mph, with no clear mileage pattern in the complaints.

   What to check: Have a mechanic inspect the throttle linkage, cable and cruise-control servo for binding or slack, and ask whether the throttle body has been cleaned or the throttle valve replaced.

   2 excerpts from owner complaints in NHTSA records

   “The incident occurred twice. First time at 65mph. Cruise control was suspected as problem so it was disconnected. The second occurrence was on 5/7/99. Speed 30mph. In both cases, the acclerator suddenly went to the floor & the vehicle shot forward at a very high rate of speed. The only way to stop it was shutting down the engine.”

   NHTSA complaint #707698, filed 1999-06

   “While driving the vehicle at 65mph the accelerator went to the floor by itself and would not come up, no accidents occurred. Continuing a couple of miles further, the vehicle totally stopped. The key would not turn the car off. The vehicle was towed, dealer cannot duplicate the problem.”

   NHTSA complaint #826502, filed 1998-08
4. 4
   Engine cooling

   3.8L head gasket failure and overheating

   • 6 complaints (7%)
   • typically at 8.6 yrs old
   • filed 1997–2001

   Owners describe blown head gaskets on the 3.8L engine, with overheating, coolant loss and the engine shutting itself off while driving. Some report the repair was done at their own cost at an independent shop, and one notes the repair involves different torque specs and larger bolts than factory. Complaints also mention overheating alarms in traffic alongside dead dash lights. One owner reports the failure at about 75,000 miles; another at around 60,000 miles describes repeated overheating in heavy traffic.

   What to check: Check coolant level and condition and look for milky oil or coolant residue on the engine; ask whether the head gaskets have been replaced and by whom.

   2 excerpts from owner complaints in NHTSA records

   “Heads/head gaskets had caused vehicle to over-heat as well as shut itself down during motion. Problem were brought to the attention of howard pontiac dealership as well as president, the following day used car manager dean schulatz had offered to make another even trade with me to a oldsmobile acheiva so he could put the vehicle I were currently operatting back in service and do the repair work needed to make it a safe vehicle for the road, but upon finding out that I have put this vehicle in a private repair shop he had declined to come …”

   NHTSA complaint #740927, filed 2001-02

   “Reporting a blown engine head gasket on a 3.8l engine, which was repaired by a independent repair shop at consumer's cost. Asking NHTSA to look into this matter. Too many complaints & report on this blown head gaskets for 3.8l engine. We are calling for help.”

   NHTSA complaint #851306, filed 1999-10
5. 5
   Exterior lighting

   Headlights cloudy, flickering or cutting out

   • 6 complaints (7%)
   • median 148,400 mi at 28.3 yrs old (2 state mileage, few)
   • filed 1997–2018

   Owners report the plastic headlight lenses turning cloudy yellow, reducing night visibility to the point that high beams are needed. Others describe headlights flickering and then going out entirely, with bulbs and grounds checked without finding the cause; one notes the lenses were only sold as part of a full lighting kit. Mostly described on cars that are well into their service life, including one report at about 235,000 miles; no single mileage pattern otherwise.

   What to check: Inspect both lenses for yellowing or crazing and check that the lights hold steady with the engine running and the switch in each position; ask whether the headlight switch or wiring has been replaced.

   2 excerpts from owner complaints in NHTSA records

   “The headlights flickered on a few occassion and then later they went off and on. This was very dangerous because you couldn't drive the car for fear the lights would go out and you would create or be in an accident. The problem went away for a few months until my brother borrowed the car for a week and the problem returned . It was very bad that week. The lights went out at least once everyday. I changed the headlight bulb and checked the grounds, the wiring system for loose wire. I couldn't find anything. …”

   NHTSA complaint #720869, filed 2000-04

   “Seat belt doesn't stay locked and latch broke, automatic head lights don't work the digital instrument cluster don't work and as soon as is gets so hot it vaper locks a lot”

   NHTSA complaint #11112292, filed 2018-07, 235,000 miles

Buying note. Check the ignition switch recall history and underhood wiring closely, and test the front belts and throttle response on a drive before buying. Overheating or coolant loss on a 3.8L car is worth a compression and coolant check before purchase.

Summary written with AI from a sample of 46 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.