Tap a category to read its complaints. One report may name several components.
When problems were reported
Mileage at the reported incident
Limited mileage data: 13 of 27 reports include usable mileage. There isn’t enough coverage to show a useful chart.
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 15 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
Service Brakes, Hydraulic. Review the 3 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
Vehicle Speed Control. Review the 3 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
1 crash reports0 fire reports2 injury reports
What owners actually said
27 reports
171,000 miles · May 11, 2015
Visibility/wiper
THE HEATER CORE HAS FAILED (ONCE AGAIN) I AM NOT SURE OF ANY COMPANY THAT HAS REALEASED THEIR CARS WITH SUCH A MAJOR FAILURE WITHOUT TAKING SOME KIND OF RESPONSIBILITY TO RECALL THIS ITEM IN THE CAR. NEARLY ALL OF THE HEATER CORES FROM MITSUBISHI DIAMANTES THAT I HAVE SEEN ARE ALL BAD. LEAKS ONTO THE ECU AND CAUSES A WHOLE HECK …
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THE HEATER CORE HAS FAILED (ONCE AGAIN) I AM NOT SURE OF ANY COMPANY THAT HAS REALEASED THEIR CARS WITH SUCH A MAJOR FAILURE WITHOUT TAKING SOME KIND OF RESPONSIBILITY TO RECALL THIS ITEM IN THE CAR. NEARLY ALL OF THE HEATER CORES FROM MITSUBISHI DIAMANTES THAT I HAVE SEEN ARE ALL BAD. LEAKS ONTO THE ECU AND CAUSES A WHOLE HECK LOAD OF PROBLEMS. PLEASE DOT HAVE MITSUBISHI RECALL THIS. AS TO THIS CAUSES IMMENSE DAMAGES AND PEOPLE LIKE ME DRIVING AROUND WITH THIS FAULTY PIECE ARE BREATHING IN THE FUMES AND DRIVING WITH NEARLY FULL FOGGED WINDSHIELDS CAUSING REALLY POOR VISIBILITY WHICH IS AN EXTREME HAZARD TO OUR ROADS AND FELLOW PEDESTRIANS PLEASE I URGE YOU TO TAKE THIS COMPLAINT SERIOUS AND USE YOUR DOT POWERS TO MAKE THIS MANUFACTURER DO WHAT IS RIGHT! THANKS FOR YOUR TIME
NHTSA ODI #10715681
31,385 miles · Sep 28, 2008
Vehicle Speed Control
WE JUST CLEARED CANADIAN CUSTOMS AT BLAINE WA, PACIFIC CROSSING, AND WERE ACCELERATING TO SPEED LIMIT ON I 5 FREEWAY WHEN THE CAR ACCELERATED TO NEAR 100 MILES AN HOUR. THE TACH AT SOME POINT WAS 7500 AND INCREASING. THE ACCELERATOR WAS STUCK AND EVENTUALLY WE WERE ABLE TO GET TO THE EMERGENCY LANE AREA AND TURNED OF THE IGNIT…
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WE JUST CLEARED CANADIAN CUSTOMS AT BLAINE WA, PACIFIC CROSSING, AND WERE ACCELERATING TO SPEED LIMIT ON I 5 FREEWAY WHEN THE CAR ACCELERATED TO NEAR 100 MILES AN HOUR. THE TACH AT SOME POINT WAS 7500 AND INCREASING. THE ACCELERATOR WAS STUCK AND EVENTUALLY WE WERE ABLE TO GET TO THE EMERGENCY LANE AREA AND TURNED OF THE IGNITION KEY. FULL PRESSURE ON THE BRAKES WOULD NOT SLOW IT DOWN MUCH. *TR WE WERE TOWED 21 MILES TO DAVIS AUTOMOTIVE IN BELLINGHAM, WA, WHERE A REPLACEMENT THROTTLE CABLE AND ASSOCIATED STRUCTURE WAS SEVERELY BENT AND THE CABLE HAD CUT THRU IT AND STUCK. *MEC THE CONSUMER HAD THE VEHICLE TOWED WHERE A REPLACEMENT THROTTLE CABLE WAS INSTALLED. UPDATED 10/10/08. *JB
NHTSA ODI #10243812
132,000 miles · Sep 17, 2008
Visibility
THIS IS THE SECOND TIME THE HEATER CORE HAS STARTED TO LEAK. IT WAS REPLACED 40K MILES AGO AND I WAS CHARGED $ 1,000 FOR REPAIR COSTS. HAVING RESEARCHED THIS, IT IS DUE TO FAULTY HEATER CORE GASKETS WHICH MITSUBISHI REPLACED THE DEFECTIVE GASKETS WITH A REDESIGNED ONE. THE CAR IS UNDRIVABLE DUE TO THE TOXIC FUMES FROM THE E…
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THIS IS THE SECOND TIME THE HEATER CORE HAS STARTED TO LEAK. IT WAS REPLACED 40K MILES AGO AND I WAS CHARGED $ 1,000 FOR REPAIR COSTS. HAVING RESEARCHED THIS, IT IS DUE TO FAULTY HEATER CORE GASKETS WHICH MITSUBISHI REPLACED THE DEFECTIVE GASKETS WITH A REDESIGNED ONE. THE CAR IS UNDRIVABLE DUE TO THE TOXIC FUMES FROM THE ETHYLENE GLYCOL COMING OUT OF ALL THE VENTS AND I DO NOT HAVE THE MONEY TO GET IT REPAIRED. MITSUBISHI REFUSES TO DO ANYTHING ABOUT IT, AND NEARLY EVERY DIAMANTE ON THE ROAD HAS HAD THIS HAPPEN. THE CARPET IS RUINED FROM THE COOLANT LEAK AS WELL, AND MANY HAVE HAD THE ECU FOR THE TRANSMISSION FAIL DUE TO COOLANT LEAKING ON IT. *TR
NHTSA ODI #10242656
900,000 miles · Apr 26, 2008
Electrical System
WILL NOT PASS EMISSION THERE ARE NO READINESS CODES STORED IN COMPUTER. *TR
NHTSA ODI #10225765
Mileage unknown · Nov 9, 2007
Visibility
EVERYTIME THE HEATER IS SWITCHED ON, I CAN FEEL A WEIRD SMELL WHICH WILL LAST FOR ABOUT 10 MINS. THIS SMELL SEEMS LIKE SUFFOCATING AND HAVE TO OPEN THE WINDOWS FOR THE FRESH AIR TO ENTER. THERE IS SOME KIND OF LEAK IN THE ENGINE COMPARTMENT, I AM NOT SURE WHERE THE LEAK IS FROM. I AM BIT WORRIED ABT THE SMELL. THANKS *TR
NHTSA ODI #10208520
131,000 miles · May 1, 2006
Visibility
FAILURE OF HEATER CORE GASKETS RESULTING IN FUMES INSIDE THE CAR FROM ANTI-FREEZE; THIS IS THE 2ND TIME THIS HAS HAPPENED WITH THIS VEHICLE IN THE LAST 35,000 MILES AND THE REPAIR LABOR IS ESTIMATED AT 6 HOURS, WHICH IS AROUND $1,000. *JB
NHTSA ODI #10156551
74,000 miles · Jan 5, 2006
Visibility
1998 MITSUBISHI DIAMANTE HEATER CORE LEAKING FOGGING WINDSHIELD DURING FREEWAY TRAVEL. HAZARD TO HEALTH WITH WHILE OPERATION AUTO. *NM
NHTSA ODI #10147032
50,000 miles · Mar 24, 2005
Visibility
WHILE DRIVING CONSUMER SMELLED A BAD ODOR COMING FROM THE HEATER CORE. HEATER SYSTEM WAS LEAKING COOLANT. THIS HAPPENED THREE TIMES. THE SEAL HAD TO BE REPLACED. *AK THE VEHICLE'S HEATER CORE AND REFRIGERANT WERE REPLACED. *NM
NHTSA ODI #10109306
78,000 miles · Feb 23, 2005
Visibility
WINDOWS FOG UP AND CANNOT BE CLEARED BY THE DEFROSTER. VERY STRONG SMELL OF ANTI-FREEZE INSIDE THE CAR. SMOKEY VAPORS COME OUT OF THE HEATING VENTS. I'M HAVING DIFFICULTY BREATHING WHILE DRIVING MY CAR, AND BELIEVE THE CAUSE OF MY NAUSEA AND HEADACHE IS DUE TO BREATHING ANTI-FREEZE VAPORS. STAIN ON PASSENGER SIDE OF CARPET. ALL …
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WINDOWS FOG UP AND CANNOT BE CLEARED BY THE DEFROSTER. VERY STRONG SMELL OF ANTI-FREEZE INSIDE THE CAR. SMOKEY VAPORS COME OUT OF THE HEATING VENTS. I'M HAVING DIFFICULTY BREATHING WHILE DRIVING MY CAR, AND BELIEVE THE CAUSE OF MY NAUSEA AND HEADACHE IS DUE TO BREATHING ANTI-FREEZE VAPORS. STAIN ON PASSENGER SIDE OF CARPET. ALL THESE SYMPTOMS INDICATE A HEATER CORE PROBLEM.*AK
NHTSA ODI #10112060
58,000 miles · Nov 30, 2004
Engine And Engine CoolingUnknown Or OtherVisibility
I OWN A PREOWNED 1998 MISTUBISHI DIAMANTE LS. WHEN THE CLIMATE CONTROL, PARTICULARLY THE HEATER IS ENGAGED, THE SMELL OF ANTI-FREEZE BECOMES QUITE APPARENT. DEALER CLAIMED 2 YEARS AGO WHEN I BOUGHT IT THAT IT WAS THE SMELL OF THE CHEMICALS USED TO CLEAN THE CAR DURING "MAKE-READY." ETHYLEN GLYCOL FUMES ARE TOXIC AND THIS IS A…
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I OWN A PREOWNED 1998 MISTUBISHI DIAMANTE LS. WHEN THE CLIMATE CONTROL, PARTICULARLY THE HEATER IS ENGAGED, THE SMELL OF ANTI-FREEZE BECOMES QUITE APPARENT. DEALER CLAIMED 2 YEARS AGO WHEN I BOUGHT IT THAT IT WAS THE SMELL OF THE CHEMICALS USED TO CLEAN THE CAR DURING "MAKE-READY." ETHYLEN GLYCOL FUMES ARE TOXIC AND THIS IS A REOCCURING DEFECT IN THIS MODEL CAR FROM POSTS I HAVE SEEN ON VARIOUS WEBSITES. I WAS LATER TOLD THAT TO FIX THIS PROBLEM WILL COST CLOSE TO $1000 SINCE THE CAR IS OUT OF WARRANTY. MITSUBISH ISSUED A TSB ADDRESSING THIS PROBLEM, OBVIOUSLY THEY ARE AWARE OF IT. IN ADDITION, THE WINDSHIELD IS COVERED WITH A FILM THAT CANNOT BE WASHED OFF FROM THIS LEAK. A RECALL SHOULD BE ISSUED FOR THIS PROBLEM, I AM NOT THE FIRST PERSON TO FILE THIS COMPLAINT ON YOUR WEBSITE. THANK YOU.*AK
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.
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
0
No exact-year investigations in this snapshot.
1998 Mitsubishi Diamante Problems, Complaints & Recalls | Skip That Year