IllustrationWINDOWS ARE FOGGING UP DO T A FAULTY HEATER CORE. I REALLY DON'T MIND REPAIRING THE CAR SEEING THAT IT HAS 120K ON IT.. I PURCHASED THE CAR BRAND NEW AND THIS WILL BE THE 3RD HEATER CORE!!! WHAT'S GOING ON! *TR
2001 Mitsubishi Diamante
Owner reports · Recalls · Investigations
Similar to other model years
Owner complaints for the 2001 Mitsubishi Diamante do not stand out strongly from 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
20–25K
1925–50K
2150–75K
1175–100K
4100–150K
0150K+
57 reports with mileage · 21 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 56 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Engine And Engine Cooling. Review the 14 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
- Power Train. Review the 4 owner reports in this category and discuss these concerns during a pre-purchase inspection. Read reports →
NHTSA owner reports · September 18, 2026 snapshot.
0 crash reports0 fire reports3 injury reports
Visibility complaints
56 reportsMITSUBISHI DIAMANTE INFAMOUS HEATER CORE PROBLEM ANTIFREEZE LEAKS INTO INTERIOR OF CAR. HORRIBLE SICKENING ANTI FREEZE SMELL, HAPPENS ON AN ABUNDANCE OF MITSUBISHI CARS. *TR
HEATER CORE IS CAUSING THE WINDOWS TO FOG UP, THE CAR TO SMELL LIKE ANTIFREEZE AND MAY BE DAMAGING THE ECU. THERE ARE HUNDREDS OF POSTS ONLINE ABOUT PEOPLE HAVING THIS PROBLEM OVER AND OVER WITH THIS CAR. IT IS CLEARLY A MANUFACTURERS DEFECT AND CUSTOMERS ARE LEFT PAYING THOUSANDS OF DOLLARS FO THE REPAIR. *TR
HEATER CORE WENT BAD AT 105,000 MILES. THIS SEEMS TO BE A MANUFACTORING PROBLEM AND MITSUBIHI SHOULD ADRESS THE ISSUE. *TR
MY 2001 MITSUBISHI DIAMANTE'S HEATER CORE WENT UP. I HAVE MASSIVE AMOUNTS OF COOLANT LEAKING ON MY PASSENGER SIDE, THICK SMOKE COMING FROM MY VENTS AND A BAD ODOR COMING FROM THE VENTS. I HAVE READ THIS IS A VERY VERY COMMON THING WITH MITSUBISHI'S ESPECIALLY DIAMANTE'S. *TR
JUST RECENTLY STARTED HAVING REALLY FOGGY WINDOWS AND STARTED TO NOTICE SWEET SMELL COMING FROM CAR WHEN HEATER/DEFROST WAS TURNED ON. NOTIFIED DEALER OF PROBLEM AND DEALER QUICKLY IDENTIFIED PROBLEM AS HEATER CORE DEFECT. *TR
TL*THE CONTACT OWNS A 2001 MITSUBISHI DIAMANTE. THE WINDOWS FOGGED UP WHEN THE AIR AND HEAT WERE ACTIVATED. THE PASSENGERS COULD SMELL ANTIFREEZE. THE DEALER STATED THAT THE HEATER CORE FAILED DUE TO DEFECTIVE O-RINGS AND NOTICED ANTIFREEZE LEAKING ONTO THE MICRO PROCESSOR. THE MICRO PROCESSOR AND HEATER CORE WERE REPLACED. …
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TL*THE CONTACT OWNS A 2001 MITSUBISHI DIAMANTE. THE WINDOWS FOGGED UP WHEN THE AIR AND HEAT WERE ACTIVATED. THE PASSENGERS COULD SMELL ANTIFREEZE. THE DEALER STATED THAT THE HEATER CORE FAILED DUE TO DEFECTIVE O-RINGS AND NOTICED ANTIFREEZE LEAKING ONTO THE MICRO PROCESSOR. THE MICRO PROCESSOR AND HEATER CORE WERE REPLACED. THE FAILURE MILEAGE WAS 70,000 AND CURRENT MILEAGE WAS 75,000.
TL*THE CONTACT OWNS A 2001 MITSUBISHI DIAMANTE. THE WINDOWS FOGGED UP WHEN THE AIR AND HEAT WERE ACTIVATED. THE PASSENGERS COULD SMELL ANTIFREEZE. THE DEALER STATED THAT THE HEATER CORE FAILED DUE TO DEFECTIVE O-RINGS. THE HEATER CORE WAS REPLACED. THE CURRENT AND FAILURE MILEAGES WERE 65,000.
2001 MITSUBISHI DIAMANTE - HAVE ANTIFREEZE ODOR COMING FROM AC VENTS. AFTER MUCH RESEARCH I FIND THAT THIS IS A RECURRING PROBLEM WITH SECOND GENERATION DIAMANTES (1997-2004) WITH THE 2001 YEAR MODEL BEING THE MOST EFFECTED. THE ODORS HAVE EVEN CAUSED RESPIRATORY PROBLEMS. I MYSELF HAVE EXPERIENCED SEVERE HEADACHES AND SLEEPINES…
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2001 MITSUBISHI DIAMANTE - HAVE ANTIFREEZE ODOR COMING FROM AC VENTS. AFTER MUCH RESEARCH I FIND THAT THIS IS A RECURRING PROBLEM WITH SECOND GENERATION DIAMANTES (1997-2004) WITH THE 2001 YEAR MODEL BEING THE MOST EFFECTED. THE ODORS HAVE EVEN CAUSED RESPIRATORY PROBLEMS. I MYSELF HAVE EXPERIENCED SEVERE HEADACHES AND SLEEPINESS DUE TO THIS PROBLEM. THE ODOR AT FIRST WAS VERY FAINT BUT BECAME WORSE OVER TIME. WITH AS MANY PROBLEMS THAT HAS OCCURRED AND THE HEALTH IMPLICATIONS RELATED TO THIS OBVIOUS DEFECT, THIS PROBLEM SHOULD BE A MANUFACTURERS RECALL TO RESOLVE THIS POTENTIALLY DANGEROUS AND HEALTH HAZARDOUS ISSUE. *TR
I HAVE A 2001 MITSUBISHI DIAMANTE LS WITH 66,000 MILE AND MY HEATER CORE WENT OUT. I NOTICED MY WINDOW WOULD FOG UP AND YOU CAN SMELL ANTIFREEZE IN THE CAR, TO HAVE THIS REPLACED IS GOING TO COST ME ALMOST $998.00 FOR PART AND LABOR. MOST MECHANICS I HAVE TALKED TO ABOUT THIS PROBLEM SAID THAT I SHOULDN'T BE HAVING THIS PROBLEM …
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I HAVE A 2001 MITSUBISHI DIAMANTE LS WITH 66,000 MILE AND MY HEATER CORE WENT OUT. I NOTICED MY WINDOW WOULD FOG UP AND YOU CAN SMELL ANTIFREEZE IN THE CAR, TO HAVE THIS REPLACED IS GOING TO COST ME ALMOST $998.00 FOR PART AND LABOR. MOST MECHANICS I HAVE TALKED TO ABOUT THIS PROBLEM SAID THAT I SHOULDN'T BE HAVING THIS PROBLEM WITH THE HEATER CORE SO EARLY. I KNOW OF NUMEROUS COMPLAINTS OF THIS DEFECT FOR THIS (NONE OF WHICH I KNEW ABOUT BEFORE I BOUGHT THE CAR) I KNOW THAT IT IS DANGEROUS FOR THE ANTIFREEZE TO BE INHALED, AND WITH ALL THE COMPLAINTS ABOUT THIS OBVIOUS DEFECT SOMETHING SHOULD BE DONE ABOUT IT. THERE IS HEALTH RISKS WITH THE HEATER CORE GOING OUT AND RELEASING THE ANTIFREEZE NOT TO MENTION THE SAFETY CONCERNS WITH THE HEATER CORE BEING SO NEAR IMPORTANT COMPUTER COMPONENTS. *TR
Official recalls
204V428000 · 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.
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.