2002 Mitsubishi Diamante Engine cooling Problems
- Complaints
- 38about this part
- Share
- 31%of 123 total for the year
- Median mileage
- 70,000miles
- Trend
- StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.
NHTSA recorded 38 complaints about the engine cooling of the 2002 Mitsubishi Diamante, 31% of the 123 complaints for this model year. Where a mileage was given, the median is 70,000 miles. 1 of these say a crash was involved, according to the filers.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“My front windshield was fogging up every time I used the heater and a smell of coolant inside my car--nasty film was left, found out it was a heater core problem. Sometimes the fog would take 20 minutes to clear up with defroster on highest settings. These problems are all over the internet with Mitsubishi diamantes. I am surprised that these have never been recalled for safety reasons.”
NHTSA complaint #10296309, filed 2009-12, 60,000 miles“The heater core. I start smelling an antifreeze smell inside the car then the check engine soon light came on. Also the tcl is on. The dealer said that it is a wheel sensor that will run me $625. The heater core is $1,200. Every one that I talk to on the email sight is having the same problem. Please help! Thanks.”
NHTSA complaint #10230393, filed 2008-06, 63,000 miles“My 2002 Mitsubishi Diamante has o ring failure in the heater coil. I have read many complaints that this is common on this model and would like a recall on these vehicles due to the extreme nature of the issue. With the failure of the o rings come potential anti freeze vapors entering passenger compartment and causing physical damage to all passengers. It may also cause the car to overheat in the middle of heavy stop and go traffic and cause accidents and/or death. …”
NHTSA complaint #10279201, filed 2009-08, 78,000 miles“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!!”
NHTSA complaint #10186998, filed 2007-04, 55,000 miles“I have a 2002 Mitsubishi Diamante with less than 100,000 miles and already I need to replace the heater coil. I guess this is on going problem with Mitsubishi.”
NHTSA complaint #10257278, filed 2009-02, 74,000 milesRelated service bulletins
- 10170074Aug 28, 2015This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170071Jul 22, 2015This is a service newsletter (Tech Talk) that was sent out to dealers.
- 10170086Nov 1, 2012This is a service newsletter (Tech Talk) that was sent out to dealers.
Engine cooling: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2003 | 17 | 30% |
| 2002 | 38 | 31% |
| 2001 | 14 | 18% |
| 2000 | 7 | 14% |
| 1999 | 3 | 13% |
| 1998 | 1 | 4% |
| 1997 | 4 | 12% |
| 1995 | 2 | 17% |
| 1994 | 2 | 7% |
| 1993 | 3 | 10% |
| 1992 | 11 | 26% |
Other parts of the 2002 Mitsubishi Diamante
71 complaintsTransmission and drivetrain
10 complaintsElectrical system
9 complaintsBrakes
5 complaintsFuel system
4 complaintsBody and structure
3 complaintsTires
3 complaintsAir bags
2 complaintsEquipment
2 complaintsOther or unknown
2 complaintsSuspension
2 complaintsWheels
2 complaints
← All problems reported for the 2002 Mitsubishi Diamante
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology