HEATER LEAKAGE FROM FAULTY SEALS, COMPLAINED OF HEADACHE FOR 3 WEEKS AS SOON AS LEAK WAS DISCOVERED AND FIXED HEADACHES HAVE BEEN GONE. *NM
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.
Engine And Engine Cooling complaints
38 reportsHEATER CORE LEAKING....CHECK ENGINE LIGHT CAME ON....WELL KNOWN AND DOCUMENTED PROBLEM WITH THE DIAMANTE....PAID CLOSE TO 800 TO HAVE REPAIRED...COOLANT LEAKED ON THE COMPUTER AND CAR WENT INTO FAIL SAFE DRIVING MODE. *NM
THIS IS THE SECOND TIME I AM COMPLAINING ABOUT THE SAME PROBLEM. THE END OF JUNE 2006 I DROVE TO WORK AND REACHED DOWN TO PICK SOME STUFF UP OFF THE PASSENGER SIDE FLOOR MAT. IT ENDED UP BEING SOAKED. AT FIRST I THOUGHT SOME WATER HAD COME IN BECAUSE THE PAST FEW DAYS OUR AREA HAD TORRENTIAL RAINS. WHEN I GOT HOME THE NEXT DA…
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THIS IS THE SECOND TIME I AM COMPLAINING ABOUT THE SAME PROBLEM. THE END OF JUNE 2006 I DROVE TO WORK AND REACHED DOWN TO PICK SOME STUFF UP OFF THE PASSENGER SIDE FLOOR MAT. IT ENDED UP BEING SOAKED. AT FIRST I THOUGHT SOME WATER HAD COME IN BECAUSE THE PAST FEW DAYS OUR AREA HAD TORRENTIAL RAINS. WHEN I GOT HOME THE NEXT DAY I TOOK UP THE FLOOR MAT TO DRY IT OUT AND NOTICE ALL THE LIQUID UNDER IT WAS GREENISH YELLOW. IN MY MIND I WENT CRAZY BECAUSE THE SAME THING HAD HAPPENED TO ME A YEAR AND 2 WEEKS EARLIER. ONCE AGAIN THE HEATER CORE BECAME FAULTY AND POURED THE ENGINE COOLANT INTO THE PASSENGER SPACES. WONDERFUL, SINCE MY WIFE WAS 8 MONTHS PREGNANT, GREAT FOR HER TO BE BREATHING THOSE CHEMICALS. I HAVE TO SAY I WAS FORTUNATE THAT IT DIDN'T LEAK ON ANY OF THE COMPUTER COMPONENTS, LIKE HAS HAPPENED TO OTHERS, ESPECIALLY WHILE I WAS DRIVING. WOULD HAVE DEFINITELY CAUSED A SAFETY ISSUE. IT JUST BLOWS MY MIND THAT I HAVE HAD TO PAY FOR THE SAME SERVICE TWICE IN ABOUT A YEAR, ON A CAR THAT HAS LESS THAN 80,000 MILES ON IT. I REALLY HOPE THE NHTSA LOOKS INTO MAKING THIS A RECALL ISSUE, BECAUSE IT IS JUST HAPPENING TO TOO MANY CONSUMERS. JUST IMAGINE ALL THOSE PEOPLE WHO DON'T EVEN KNOW THEY CAN FILE A COMPLAINT. YES, I KNOW THERE WERE NO DEATHS OR INJURIES IN MY CASE, BUT WHEN THE COOLANT LEAKS ON THE COMPUTER BRAIN OF THE CAR, IT COULD BECOME A REAL ISSUE IF DRIVING ON THE HIGHWAY OR NAVIGATING CROWDED STREETS IN TOWN. THE POWER STEARING OR ANTILOCK BRAKES WOULD SHUT DOWN IF THE COMPUTER CRASHED FROM GETTING WET.
I PURCHASED A USED 2002 MITSUBISHI DIAMANTE IN AUGUST 2005. THE CAR HAD 45,000 MILES ON IT. IN OCTOBER WHEN I STARTED TO USE THE HEATER I COULD SMELL AN UNUSUAL SMELL INSIDE THE CAR. IN JANUARY OF 2006 MY BROTHER RODE IN THE CAR AND TOLD ME THE SMELL WAS ANTI-FREEZE. I WENT ON THE INTERNET AND INSTANTLY FOUND OUT THAT THIS MODEL…
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I PURCHASED A USED 2002 MITSUBISHI DIAMANTE IN AUGUST 2005. THE CAR HAD 45,000 MILES ON IT. IN OCTOBER WHEN I STARTED TO USE THE HEATER I COULD SMELL AN UNUSUAL SMELL INSIDE THE CAR. IN JANUARY OF 2006 MY BROTHER RODE IN THE CAR AND TOLD ME THE SMELL WAS ANTI-FREEZE. I WENT ON THE INTERNET AND INSTANTLY FOUND OUT THAT THIS MODEL CAR HAS A PROBLEM WITH THE HEATER CORE O-RINGS FAILING. THE SMELL IN THE CAR GOT REAL BAD REAL QUICK AND I HAD TO HAVE THE LEAKING O-RINGS REPAIRED. I WOULD GET SICK FROM THE SMELL AND HAD NO CHOICE BUT TO HAVE IT FIXED. I BROUGHT THE CAR TO A MITSUBISHI DEALER AND HAD THE REPAIR DONE FOR $650.THE CAR HAD 48,000 MILES ON IT WHEN THE REPAIR WAS MADE. THAT IS ALOT OF MONEY FOR PROBLEM THAT MITSUBISHI SHOULD HAVE CORRECTED. *JB
HEATER CORE (AND POSSIBLE EFFECT ON TRANSMISSION ISSUES) GOING UP BEFORE ITS TIME (AND THIS KNOWN TO BE A PROBLEM ON THE DIAMANTES FOR OVER 3 YEARS OF THE MODEL) AND CAUSING ANTIFREEZE FUMES AND SMOKE TO FILL MY CAR FOR MONTHS UNNOTICED EXPOSING MY FAMILY AND SELF TO NAUSEOUSNESS, HEADACHES, NOT TO MENTION EXPENSE OF REPAIR ON A…
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HEATER CORE (AND POSSIBLE EFFECT ON TRANSMISSION ISSUES) GOING UP BEFORE ITS TIME (AND THIS KNOWN TO BE A PROBLEM ON THE DIAMANTES FOR OVER 3 YEARS OF THE MODEL) AND CAUSING ANTIFREEZE FUMES AND SMOKE TO FILL MY CAR FOR MONTHS UNNOTICED EXPOSING MY FAMILY AND SELF TO NAUSEOUSNESS, HEADACHES, NOT TO MENTION EXPENSE OF REPAIR ON A RELATIVELY NEW VEHICLE. *NM
MY WIFE AND I OWN A 2002 MITSUBISHI DIAMANTE VR-X. THIS PAST JUNE 2005 I STARTED NOTICING THE CAR WAS OVERHEATING WHEN I WOULD STOP AT LIGHTS OR IN TRAFFIC. AT FIRST I FIGURED IT WAS THE REALLY HOT WEATHER WE WERE HAVING. AFTER A DAY OR SO I NOTICED THE ENGINE TEMPERATURE WOULD FLUCTUATE EVEN AT HIGHER SPEEDS, SO I PULLED…
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MY WIFE AND I OWN A 2002 MITSUBISHI DIAMANTE VR-X. THIS PAST JUNE 2005 I STARTED NOTICING THE CAR WAS OVERHEATING WHEN I WOULD STOP AT LIGHTS OR IN TRAFFIC. AT FIRST I FIGURED IT WAS THE REALLY HOT WEATHER WE WERE HAVING. AFTER A DAY OR SO I NOTICED THE ENGINE TEMPERATURE WOULD FLUCTUATE EVEN AT HIGHER SPEEDS, SO I PULLED INTO A GAS STATION AND CHECKED THE COOLANT. IT WAS LOW. I BOUGHT SOME COOLANT AND FILLED UP THE RESERVOIR THINKING I HAD FOUND MY PROBLEM. THE NEXT DAY I NOTICED I WAS HAVING PROBLEMS AGAIN AND CHECKED THE FLUID LEVEL, IT WAS LOW AGAIN. I KNEW SOMETHING WAS WRONG THEN AND I TOOK IT TO MY MECHANIC. LOW AND BEHOLD I COME TO FIND OUT THAT THE ANTIFREEZE, WHICH IS POISONOUS, HAS LEAKED ALL OVER PASSENGER SIDE FLOOR AND WAS TOLD THAT IT PROBABLY HAD BEEN BLOWING OUT OF THE VENTS ALSO. THIS WAS VERY DISCONCERTING NOT JUST FOR THE HEALTH OF MY WIFE AND MYSELF, BUT ALSO BECAUSE WE HAD, AT THE TIME, A FIVE MONTH OLD WHO ALSO HAD BEEN BREATHING THIS POISON. I PRAY WE DON'T END UP HAVING ANY RESPIRATORY PROBLEMS, ESPECIALLY MY DAUGHTER, FROM THIS IN THE FUTURE. WHAT ENDED UP BEING THE PROBLEM WAS THE HEATER CORE CORRODED AND WAS LEAKING INTO THE CAR. MY MECHANIC SAID THIS IS NOT SOMETHING THAT SHOULD HAPPEN TO A CAR WITH ONLY 50K MILES. ACTUALLY, THEY SAID IT GENERALLY SHOULD NEVER HAPPEN TO A VEHICLE. I COME TO FIND OUT THAT THE LEAK IS JUST ABOVE THE CARS COMPUTER SYSTEM. FORTUNATELY THE LEAK DIDN'T AFFECT THESE ELECTRONIC COMPONENTS. I SEE FROM THE HTTP://WWW.MYCARSTATS.COM WEBSITE THAT THIS PROBLEM IS VERY PREVALENT AND I'M SURE IT HAS HAPPEN TO OTHERS THAT DON'T KNOW WHO TO CONTACT ABOUT THE PROBLEM. IT ENDED UP COSTING ME $1300 TO GET IT FIXED. THE PROBLEM LIES BEHIND THE DASHBOARD WHICH ENDS UP CREATING A LOT OF LABOR CHARGES TO FIX THE PROBLEM. I HOPE THAT THERE IS SOMETHING DONE BY THE ODI IN RESPONSE TO THIS COSTLY, UNNECESSARY PROBLEM. *NM
THIS HEATER CORE LEAKS DIRECTLY OVER COMPUTERS WHICH CONTROL THE ENGINE - AND COULD CAUSE IT TO ACT UNPREDICTABLY OR CUT OUT ALTOGETHER WHEN DRIVING. *AK * ANTI-FREEZE CONTAINS ETHYLENE GYLCOL WHICH CAN CAUSE SERIOUS RESPIRATORY DAMAGE * THE LEAKING ANTI-FREEZE CAUSES A FILM TO FORM ON THE WINDSHIELD, WHICH CAN CAUSE THE …
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THIS HEATER CORE LEAKS DIRECTLY OVER COMPUTERS WHICH CONTROL THE ENGINE - AND COULD CAUSE IT TO ACT UNPREDICTABLY OR CUT OUT ALTOGETHER WHEN DRIVING. *AK * ANTI-FREEZE CONTAINS ETHYLENE GYLCOL WHICH CAN CAUSE SERIOUS RESPIRATORY DAMAGE * THE LEAKING ANTI-FREEZE CAUSES A FILM TO FORM ON THE WINDSHIELD, WHICH CAN CAUSE THE WINDSCREEN TO FOG UP SUDDENLY, OBSCURING THE VIEW OF THE ROAD AND POTENTIALLY CAUSING A COLLISION IT WILL COST ME MORE THAN 900.00 TO REPAIR THIS ITEM, PLUS THE COST TO REPLACE MY CARPET AND TO CLEAN THE INTERIOR OF MY VEHICLE. PLUS I DO NOT KNOW IF I WILL EVERGET RID OF THE SMELL AND THIS WILL MOST LIKELY LOWER THE RESALE VALUE COSTING ME EVEN MORE IN THE LONG TERM.I WOULD EXPECT THIS KIND OF THING TO HAPPEN TO A CAR THAT IS MORE THAN 10 YEARS OR OLD. BUT IN A CAR THAT WAS MADE IN 2001 AND HAS ONLY 54,000 MILES AND WAS SERVICED REGULARLY AT THE COMPANY'S OWN DEALER SERVICE CENTER IS ABSURD. I FOLLOWED ALL THE MANUFACTURERS SERVICE INTERVALS AND AM BEING TOLD THAT THIS USUALLY HAPPENS WHEN THE COOLANT IS NOT CHANGED, THIS MAKES ME QUESTION THE DEALERS' AND MANUFACTURERS' COMMITMENT TO SAFETY. I AM SAVING THE PARTS THAT ARE BEING REPLACED AND WILL MAKE THEM AVAILABLE FOR INSPECTION IF NEED BE.
WHILE DRIVING ENGINE CHECK LIGHT WILL NOT ILLUMINATE. VEHICLE STALLED. CONSUMER TOOK VEHICLE TO DEALER, AND WAS TOLD THEY COULD NOT FIX THE VEHICLE BECAUSE THE ENGINE CHECK LIGHT DID NOT ILLUMINATE. ALSO, WAS TOLD THEY REPLACED THE CRANK SENSOR. CONSUMER TOOK VEHICLE TO DEALER THREE TIMES FOR THE SAME PROBLEM. *AK
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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