FOGGY SPOTS ON FRONT WINDSHIELD, SYRUP LIKE SMELL, AND VAPORS BLOWN THROUGH FRONT VENTS. HEATER CORE GASKET LEAKED COOLANT FLUID INTO CAR DRIPPING ON PASSENGER SIDE, FOUND FLUID UNDERNEATH CARPET. MITSUBISHI DEALERSHIP REPLACED HEATER CORE. *AK
2002 Mitsubishi Diamante
Owner reports · Recalls · Investigations
More warning signs than most Diamante years
Owner complaints for the 2002 Mitsubishi Diamante are substantially higher than the model-year median of 31.5.
About this comparison →How this year compares
Owner complaints by model year
Compare all Diamante years →Counts vary with age, sales and reporting. They are not failure rates.
What owners reported most
All reported categories
Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
92 reports with mileage · 31 unknown
NHTSA’s mileage field refers to the reported incident, not necessarily the filing date. This shows report counts, not the likelihood of a failure.
What to inspect
Issues worth paying extra attention to based on owner reports.
- Visibility. Review the 71 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Engine And Engine Cooling. Review the 38 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 10 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
What owners actually said
123 reportsRECENTLY THE WINDOWS KEEP FOGGING UP IN MY 2002 MITSUBISHI DIAMANTE. I HAVE FOUND THROUGH COMPLAINTS WITH YOU AND OTHER INTERNET SITES THAT THIS IS A COMMON COMPLAINT AND VERY EXPENSIVE TO REMEDY. IS THERE NOTHING BEING DONE BY NHSTA TO MAKE THE MANUFACTURE FIX THIS DANGEROUS PROBLEM? EVERY DAY IT GETS WORSE. SO FAR I HAVE NOT N…
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RECENTLY THE WINDOWS KEEP FOGGING UP IN MY 2002 MITSUBISHI DIAMANTE. I HAVE FOUND THROUGH COMPLAINTS WITH YOU AND OTHER INTERNET SITES THAT THIS IS A COMMON COMPLAINT AND VERY EXPENSIVE TO REMEDY. IS THERE NOTHING BEING DONE BY NHSTA TO MAKE THE MANUFACTURE FIX THIS DANGEROUS PROBLEM? EVERY DAY IT GETS WORSE. SO FAR I HAVE NOT NOTICED A COOLANT LEAK, BUT FROM WHAT I HAVE READ, IT IS FORTHCOMING IS A VERY DANGEROUS PROBLEM THAT NEEDS TO BE SOLVED!! *AK
HEATER CORE FAILURE. *JB
NOTICE THICK RESIDUE ON FRONT WINDOW AND WAS NOT ABLE TO REMOVE IT WITH DEFOGGER. NOTICE LOSE OF ANTIFREEZE WHICH CAUSED OVER HEATING AND POTENTIAL ENGINE CEASING. THEN NOTICED PASSENGER SIDE CARPET WAS FULL OF ANTI-FREEZE. AFTER INTENSE CLEANING AND ATTEMPTS TO FIX THE PROBLEM, IT STILL EMITS A MAPLE SYRUP ANTI FREEZE TOXIC FUM…
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NOTICE THICK RESIDUE ON FRONT WINDOW AND WAS NOT ABLE TO REMOVE IT WITH DEFOGGER. NOTICE LOSE OF ANTIFREEZE WHICH CAUSED OVER HEATING AND POTENTIAL ENGINE CEASING. THEN NOTICED PASSENGER SIDE CARPET WAS FULL OF ANTI-FREEZE. AFTER INTENSE CLEANING AND ATTEMPTS TO FIX THE PROBLEM, IT STILL EMITS A MAPLE SYRUP ANTI FREEZE TOXIC FUME
HEATER CORE PROBLEM. WINDOW FOG. ANTI FREEZE SMELL IN SIDE OF CABIN. EXTENDED WARRANTY IS NOT COVER.ONLY 28800 MILES 2002 DIAMANTE. *JB
LEAKAGE OF ANTIFREEZE ( ENGINE COOLANT) INTO THE PASSENGER COMPARTMENT OF VEHICLE. THE COOLANT SMELL WAS APPARENT WITHIN THE CAR. *NM
WINDOWS WILL NOT DEFROST AND ODOR COMING FROM VENTS. ALSO PUDDLE OF ANTI-FREEZE ON PASSENGER FLOOR. DID NOT THINK PROBLEMS WHERE RELATED BUT THEY ARE. HEATER CORE GASKET LEAKING AND CAUSING THE PROBLEMS. $1 GASKET AND $700+ LABOR. THIS IS A SCAM FROM THE DEALERSHIP, EXPLOIT A UNSAFE DEFECT AND THEN CHARGE AN ARM AND A LEG T…
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WINDOWS WILL NOT DEFROST AND ODOR COMING FROM VENTS. ALSO PUDDLE OF ANTI-FREEZE ON PASSENGER FLOOR. DID NOT THINK PROBLEMS WHERE RELATED BUT THEY ARE. HEATER CORE GASKET LEAKING AND CAUSING THE PROBLEMS. $1 GASKET AND $700+ LABOR. THIS IS A SCAM FROM THE DEALERSHIP, EXPLOIT A UNSAFE DEFECT AND THEN CHARGE AN ARM AND A LEG TO GET IT FIXED. NEXT THEY WILL CHARGE FOR THE AIR WE BREATHE. *JB
HEATER LEAKAGE FROM FAULTY SEALS, COMPLAINED OF HEADACHE FOR 3 WEEKS AS SOON AS LEAK WAS DISCOVERED AND FIXED HEADACHES HAVE BEEN GONE. *NM
NOTICED ANTI-FREEZE SMELL WITHIN THE VEHICLE. WINDSHIELD FOGGING UP AND HEATER WAS NOT WORKING PROPERLY. TOOK TO DEALERSHIP AND WAS TOLD O-RINGS NEEDED REPLACED. ADVISED WORK WAS COMPLETED, CHARGED $652.97, AND THE NEXT DAY STILL EXPERIENCING THE SAME PROBLEMS. CONTACTED THE DEALERSHIP. THEY ARE GOING TO INVESTIGATE FURTHER…
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NOTICED ANTI-FREEZE SMELL WITHIN THE VEHICLE. WINDSHIELD FOGGING UP AND HEATER WAS NOT WORKING PROPERLY. TOOK TO DEALERSHIP AND WAS TOLD O-RINGS NEEDED REPLACED. ADVISED WORK WAS COMPLETED, CHARGED $652.97, AND THE NEXT DAY STILL EXPERIENCING THE SAME PROBLEMS. CONTACTED THE DEALERSHIP. THEY ARE GOING TO INVESTIGATE FURTHER. *JB
I AM FILING THIS COMPLAINT WITH THE NHTSA DEPARTMENT ON BEHALF OF MYSELF AND OVER 40 OTHER OWNERS OF THE 2002 MITSUBISHI DIAMANTE AUTOMOBILE. THE BACK GROUND ON ALL OF THESE COMPLAINTS CAN BE VIEWED AT WWW.MYCARSTATS.COM . IT IS MY FEELING THAT THESE MITSUBISHI CUSTOMERS WERE UNDER THE IMPRESSION THAT FILING A COMPLAINT ON MYC…
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I AM FILING THIS COMPLAINT WITH THE NHTSA DEPARTMENT ON BEHALF OF MYSELF AND OVER 40 OTHER OWNERS OF THE 2002 MITSUBISHI DIAMANTE AUTOMOBILE. THE BACK GROUND ON ALL OF THESE COMPLAINTS CAN BE VIEWED AT WWW.MYCARSTATS.COM . IT IS MY FEELING THAT THESE MITSUBISHI CUSTOMERS WERE UNDER THE IMPRESSION THAT FILING A COMPLAINT ON MYCARSTATS.COM WAS THE SAME AS FILING ONE WITH THE NHTSA. IF YOU WOULD TAKE THE TIME TO VIEW THE VARIOUS STORIES UNDER THE COMPLAINTS SECTION, SUB HEADINGS ENGINE COOLING SYSTEMS AND VISUAL SYSTEMS, YOU WILL SEE THE MAGNITUDE AND THE SIMILARITIES OF THE PROBLEM. YOU WILL ALSO FIND A SIMILAR COLLECTION OF COMPLAINTS UNDER OTHER VEHICLE MODEL YEARS, AS MITSUBISHI BUILT THIS VEHICLE WITH THE SAME PROBLEM, FOR MANY YEARS. THE MAIN PROBLEM IS IN THE FAULTY DESIGN OF THE O RINGS THAT WERE TO SEAL THE ENGINE COOLANT FROM LEAKAGE AS IT ENTERS THE CABIN HEATER CORE. THIS IS A PROBLEM THAT MITSUBISHI RECOGNIZED AND ACTUALLY ISSUED A SERVICE BULLETIN ADVISING DEALERS OF A REPAIR KIT DESIGNED TO ELIMINATE THE LEAKS THAT ARE SURE TO DEVELOP. AS YOU WILL LEARN FROM READING THE COMPLAINTS OF THE MANY OWNERS ON THE WWW.MYCARSTATS.COM WEB SITE, THIS LEAKING PROBLEM HAS CAUSE THESE OWNERS TO SPEND IN THE AREA OF $800 TO $1200 IN REPAIRS ON VEHICLES WITH RELATIVELY LOW MILES. IN MANY CASES THE MILES ARE AS LOW AS 40,000. THE LOWER COSTS OF REPAIR ARE USUALLY FOUND AT INDEPENDENT REPAIR SHOPS WITH THE HIGHER COSTS NORMALLY ATTRIBUTED TO MITSUBISHI DEALERSHIPS. MOST COMPLAINING OWNERS ONLY MENTION THE ACCUMULATION OF ANTI-FREEZE VAPOR ON WINDOWS AND THE SATURATION OF THE VEHICLES FLOOR COVERING. SOME ALSO REPORT DAMAGE TO THE VEHICLES COMPUTER SYSTEM. I ASK ONLY THAT YOU VISIT THE WWW.MYCARSTATS.COM WEB SITE AND REVIEW THE EXTENSIVE LIST OF ALMOST IDENTICAL COMPLAINTS. I FEEL THAT AFTER DOING SO YOU WILL FEEL, AS I, THAT MITSUBISHI OWNS THEIR CUSTOMERS REIMBURSEMENT FOR THE PROBLEMS THEIR FAULTY DESIGN HAS CAUSED. *JB
Official recalls
304V428000 · Equipment:other:labels
Sep 1, 2004
CERTAIN PASSENGER VEHICLES FAIL TO CONFORM TO THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 208, 'OCCUPANT CRASH PROTECTION.' THE BILINGUAL ENGLISH/SPANISH REMOVABLE AIR BAG WARNING LABELS AFFIXED TO THE DASH AND TO THE SUNVISOR DO NOT MEET THE SIZE REQUIREMENTS OF THE STANDARD.
Consequence & remedy
Consequence: THIS DOES NOT MEET THE REQUIREMENTS OF THE STANDARD.
Remedy: MITSUBISHI CARIBBEAN WILL MAIL A CUSTOMER NOTIFICATION LETTER CONTAINING A WRITTEN DESCRIPTION AND A GRAPHIC OF THE BI-LINGUAL DASHBOARD AIR BAG WARNING LABEL. IN ADDITION, ALL CURRENT 2000-2004 NATIVA OWNERS WILL ALSO RECEIVE REPLACEMENT AIR BAG ALERT LABELS FOR THE SUN VISORS. THIS RECALL IS EXPECTED TO BEGIN DURING MARCH OR APRIL 2005. THE NOTIFICATION TO THE NATIVA OWNERS IS EXPECTED TO BEGIN DURING APRIL OR MAY 2005. OWNERS SHOULD CONTACT MITSUBISHI CARIBBEAN AT 1-787-251-8715.
04V067000 · Equipment:other:owners/service/other Manual
Feb 11, 2004
CERTAIN SPORT UTILITY AND PASSENGER VEHICLES FAIL TO COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 225, "CHILD RESTRAINT ANCHORAGE SYSTEMS." THE OWNER'S MANUAL DOES NOT CONTAIN A STEP-BY-STEP DESCRIPTION FOR HEADREST ADJUSTMENT WHEN INSTALLING A CHILD RESTRAINT SYSTEM (CRS) TETHER STRAP.
Consequence & remedy
Consequence: IF THE TETHER STRAP IS IMPROPERLY INSTALLED TO THE TETHER ANCHOR, THE CHILD SAFETY SEAT MAY NOT BE SUFFICIENT RESTRAINED. IN THE EVENT OF A CRASH, THE CHILD COULD BE INJURED.
Remedy: A LETTER OUTLINING THE PROBLEM WILL BE SENT TO OWNERS ALONG WITH A STICKER CONTAINING THE CORRECT INSTRUCTIONS AS WELL AS INSTRUCTIONS ON WHERE TO AFFIX THE STICKER IN THE OWNER'S MANUAL. THE RECALL BEGAN ON MARCH 29, 2004. OWNERS SHOULD CONTACT MITSUBISHI AT 1-888-648-7820.
02V100001 · Electrical System:wiring:front Underhood
Apr 7, 2002
ON CERTAIN PASSENGER VEHICLES, THE MAIN UNDER HOOD ELECTRICAL WIRING HARNESS MAY HAVE INSUFFICIENT CLEARANCE BETWEEN THE ENGINE CONTROL HARNESS AND THE EXHAUST HEAT SHIELD. AS A RESULT, THE HARNESS COULD COME IN CONTACT WITH THE HEAT SHIELD, WHICH COULD RESULT IN MELTING OF THE HARNESS INSULATION.
Consequence & remedy
Consequence: THE MELTING OF THE HARNESS INSULATION COULD RESULT IN GROUNDING OF THE CRANK ANGLE SENSOR WIRING, CAUSING THE ENGINE TO RUN ERRATICALLY OR STOP SUDDENLY, INCREASING THE RISK OF A CRASH.
Remedy: DEALERS WILL INSPECT THE HARNESS FOR DAMAGE AND, IF NONE IS EVIDENT, WILL TIE THE HARNESS BACK TO PREVENT THE HARNESS FROM EVER COMING INTO CONTACT WITH THE HEAT SHIELD. ANY HARNESS THAT SHOWS EVIDENCE OF DAMAGE WILL BE REPAIRED AS NECESSARY AND THEN TIED BACK TO PREVENT FUTURE DAMAGE. OWNER NOTIFICATION BEGAN MAY 13, 2002. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT MITSUBISHI AT 1-800-222-0037.
Model-level recall history does not show whether a particular VIN is affected or has received a repair. Check a VIN with NHTSA ↗
NHTSA investigations
0No exact-year investigations in this snapshot.
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