Most common 2000 Mitsubishi Diamante problems
Share of the 51 complaints; one complaint can involve more than one system. "~" is the median mileage when the problem started.
Mitsubishi Diamante complaints by model year
Best Diamante years: 1995, 1999, 1998. Years to avoid: 2002, 2001, 2003, 2000. Compare all years →
2000 Mitsubishi Diamante recalls (3)
Equipment › Other › Labels
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.
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.
Equipment › Other › Owners/service/other manual
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.
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.
Parking brake › Driveline › Hydraulic
Vehicle description: passenger vehicles. The head of the screw that holds the retaining clip for the parking brake shoe can become brittle and break off.
Remedy: Dealers will replace the retaining clip screw and in the process inspect the rear brake system of any possible related damage. Any related damage that May be found will also be repaired.
What 2000 Mitsubishi Diamante owners say
A/C & heater all 24 →
For several weeks it was becoming increasingly difficult for me to clear the windshield on my car and I attributed it to hot, humid weather. Coming back on the freeway one evening it suddenly became much worse and my husband and I tried many different combinations of cool/warm/fresh air to be able to see out of the window, but it never fully cleared. It was dangerous to drive under those conditions, but we made it home. There was a whitish film beginning to form on the window, visible in daylight. What was in the fumes that formed the film I am afraid to imagine. Several days later as I was driving my son to school we both noticed a white, cloudy smoke coming from the vents directly in front of us. We kept the windows down to avoid breathing in the fumes. The next day I took my car to the dealership and was told the gaskets adjacent to the heater core had failed. …
For over 2 years now I have had problems with an odor in my 2000 diamanti and the defogger never seemed to work on the windows. A couple of weeks ago I saw something leak onto the passenger side rug but didn't' t guess that this could have something to do with the heater core. Upon taking it to my dealer I was told this was hole in the heater core that had to be fixed immediately because it was dangerous and hazardous to my health to breath the fumes that were coming out of the core. The cost would be approximately $1200. I noticed I often had headaches when I drove long distances but was very concerned when my grandchild became very car sick (which had never happened before) upon riding in my car. I still didn't associate the heater with our problems. I think this is very dangerous and something should be recalled on these. …
Engine & cooling
The fumes of antifreeze fogged up the windows severely, reducing visibility of the driver. It was raining one night and my windows all of a sudden got foggy. I turned on the defroster, which made my windows even foggier. The poor visibility caused me to run off the road into the grassy median. I was out of town when this occurred. In doing research on this problem I found that it was common all diamantes (92 -2001). In many cases, the driver is not aware that this is a severe problem. The antifreeze will started leaking on the passenger?s side area. Causing more strong smell of toxic antifreeze. I believe this to be a safety issue.
My wife and I noticed antifreeze odor coming in through vents. When our windows would fog, our defroster wouldn't work. Then our passenger side floor was soaked with antifreeze. We took the car to the dealer, our heater core was leaking. Cost was $1300 to repair. Mitsubishi should be held responsible!! Too many complaints.
Windows, wipers & sunroof
My wife and I noticed antifreeze odor coming in through vents. When our windows would fog, our defroster wouldn't work. Then our passenger side floor was soaked with antifreeze. We took the car to the dealer, our heater core was leaking. Cost was $1300 to repair. Mitsubishi should be held responsible!! Too many complaints.
The heating system on this vehicle has failed repeatedly on this vehicle. Ususally this is only a minor inconvenience. There have been two instances where it was dangerous. Once was in a heavy rain, where the defroster failed, the other was just recently in a rain/snow mix. The interior of the windshield completely fogs up making vision to the road and oncoming traffic very poor. I have had a "chip" replaced twice under warranty and will try again.
2000 Mitsubishi Diamante engines & fuel economy
| Engine | Transmission | Drive | MPG city / hwy / combined |
|---|---|---|---|
| 3.5L 6-cyl | 4-speed automatic | FWD | 16 / 23 / 18 |
EPA ratings. Class: Midsize car.
Frequently asked questions
Is the 2000 Mitsubishi Diamante a good car?
Based on 51 owner complaints filed with NHTSA, the 2000 Diamante rates use caution: 1.6× as many complaints as a typical year of the Diamante at the same age. It is one of the Diamante years we suggest avoiding. Complaint counts don't account for sales volume or individual maintenance, so have any used car inspected before buying.
What is the most common problem with the 2000 Mitsubishi Diamante?
The a/c & heater — 24 complaints, 47% of all complaints for this model year, most often about defroster/defogger/hvac system › heater core. Next are the engine & cooling (7) and windows, wipers & sunroof (4).
How many recalls does the 2000 Mitsubishi Diamante have?
There are 3 recalls for the 2000 Mitsubishi Diamante, the most recent from September 1, 2004 (labels). Recall repairs are free at any authorized dealer — check whether yours has been done with the VIN recall check.
What are the best and worst years of the Mitsubishi Diamante?
The best years by complaints, compared at the same age, are 1995, 1999 and 1998. Years to avoid or approach with caution: 2002, 2001, 2003 and 2000. See the full Mitsubishi Diamante years comparison.
At what mileage do 2000 Mitsubishi Diamante problems happen?
The median mileage reported in complaints is about 60,000 miles; 36% of problems with a recorded mileage started before 50,000 miles.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.