Problems owners report
Complaints filed with NHTSA about the 1984 Mercury Cougar, by the system named in each complaint. One complaint can name several.
- Electrical system7
- Engine and engine cooling4
- Steering2
- Service brakes, hydraulic2
- Seat belts2
- Vehicle speed control1
- Visibility1
- Unknown or other1
- Fuel system, gasoline1
NHTSA ODI complaints (public domain) · updated 23 Oct 2026 · 0 injuries and 0 deaths reported
Compared with other years
NHTSA ODI complaints by model year
In New Zealand
1 1984 cars are on the New Zealand register; 100% arrived as used imports, 0% were sold new in New Zealand.
NZ Transport Agency Waka Kotahi, Motor Vehicle Register (March 2026) · CC BY 4.0
Recalls in Canada
1 Transport Canada recall for the 1984 Mercury Cougar.
| 1983114 17 Dec 1983 | Not Entered THE UPPER TORSO RESTRAINT D-RING WHICH ATTACHES THE SHOULDER BELT TO THE B PILLAR, UNDER CERTAIN TEST CONDITIONS, SEPARATED FROM ITS ANCHORAGE, AND MAY NOT COMP… |
Transport Canada Vehicle Recalls Database · Contains information licensed under the Open Government Licence – Canada
Recalls
THE BOLTS THAT ATTACH THE D-SHAPED RING FOR THE SHOULDER BELT ARE INADEQUATELY SUPPORTED BY THE MATERIAL IN WHICH THEY ARE MOUNTED. THE ATTACHMENT DOES NOT COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 210, "SEAT BELT ASSEMBLY ANCHORAGES".
Whether a recall was fixed on a particular car is known only to the manufacturer: check the VIN at nhtsa.gov/recalls.
NHTSA recalls · summaries in NHTSA's own words
Service bulletins
What Mercury told its dealers about the 1984 Mercury Cougar: known faults, fixes and updates.
| Bulletin | Summary |
|---|---|
| 623988 | INFORMATION REGARDING TRANSMISSION FLUID USAGE CHARTS. *SLC |
| 601343 | A NEW SILICONE GASKET AND SEALANT. *YC |
| 601290 | INFORMATION ON TIRE COMPANY TELEPHONE NUMBERS FOR CUSTOMER ASSISTANCE. *YC |
| 601238 | INFORMATION ON A NEW TRANSMISSION FLUID USAGE CHART. *YC |
| 601012 | THE USE OF PETROLEUM-BASED GREASE AS A LUBRICANT IN SERVICING DISC BRAKES IS NO LONGER ACCEPTABLE. *YC |
| 51945 | FLUID- TRANSMISSION FLUID USAGE CHARTS. *JD |
| 50940 | WINDSHIELD AND INTERIOR GLASS - FOG/FILM. *TW |
| 50908 | TORQUE CONVERTER - LEAK TEST PROCEDURE - SERVICE TIP. *TW |
| 50905 | WIRING - ELECTRICAL DIODE IDENTIFICATION AND SERVICE REPLACEMENTS. *TW |
| 46478 | THE USE OF PETROLEUM-BASED GREASE AS A LUBRICANT IN SERVICING DISC BRAKES IS NO LONGER ACCEPTABLE BECAUSE IT MAY BE INCOMPATIBLE WITH THE RUBBER MATERIAL USED IN THE DISC BRAKE SYSTEM. IF PETROLEUM-BASED GREASE IS USED TO LUBRICATE ANY PART OF THE DISC BRAKE SYSTEM, IT COULD CAUSE RUBBER PARTS TO SWELL IF LUBRICANT CONTACTS THE RUBBER MATERIAL. |
| 39900 | ROUGHNESS CONCERN DURING BRAKE APPLICATION. *TW |
| 3030300 | UNKNOWN |
NHTSA manufacturer communications (public domain)
NHTSA investigations
PARKING BRAKE FAILURE
SEATBACK FAILURE
NHTSA Office of Defects Investigation