Problems owners report
Complaints filed with NHTSA about the 1999 Monaco Coach Diplomat, by the system named in each complaint. One complaint can name several.
- Visibility3
- Equipment2
- Tires2
- Fuel system, gasoline2
- Service brakes, hydraulic1
- Power train1
- Electrical system1
- Unknown or other1
- Fuel system, diesel1
- Structure1
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
Recalls
MONACO IS RECALLING CERTAIN MOTOR HOMES EQUIPPED WITH NORCOLD REFRIGERATORS. A FATIGUE FAILURE IN THE SECTION OF THE COOLING UNIT WHICH CONTAINS THE REFRIGERANT COULD ALLOW THE LIQUID SOLUTION TO SLOWLY LEAK.
ON CERTAIN MOTOR HOMES, THE FEDERAL IDENTIFICATION TAG ON BOTH 36' AND 38' MODELS WAS INCORRECT. THE INITIAL TAG SHOWS THE PSI AS 90 LBS. FRONT AND 100 LBS. REAR. THE CORRECT PSI IS 105 FRONT AND 115 REAR. ALSO, THE FEDERAL IDENTIFICATION TAG ON CERTAIN UNITS INCORRECTLY STATES THAT THE UNIT WAS BUILT WITH A TAG AXLE.
ON CERTAIN MOTORHOMES, FIFTH WHEELS AND TRAVEL TRAILERS EQUIPPED WITH NORCOLD REFRIGERATOR COOLING UNITS MODEL NUMBERS 1200LR AND 1200RIM, THESE REFRIGERATORS CAN EXPERIENCE LOW CYCLE FATIGUE FAILURE WHICH CAN LEAD TO THE LIQUID SOLUTION SLOWLY LEAKING FROM THE SEALED, PRESSURIZED COOLING UNIT THROUGH A SMALL CRACK.
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 Monaco Coach told its dealers about the 1999 Monaco Coach Diplomat: known faults, fixes and updates.
| Bulletin | Summary |
|---|---|
| 614825 | CONCERNS WITH THE OVERHEAD TELEVISION CABINET TRIM RING NOT SECURED PROPERLY. *TT |
| 603242 | CONCERNS WITH DASH A/C COMPRESSOR IN ENGINE COMPARTMENT: ADJUSTMENT MAY LOOSEN. *YC |
| 603241 | CONDITIONS WITH THE STEERING COLUMN OFF CENTER. *YC |
NHTSA manufacturer communications (public domain)