general problems of the 2002 Mitsubishi Diamante

12 problems related to engine and engine cooling have been reported for the 2002 Mitsubishi Diamante. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Mitsubishi Diamante based on all problems reported for the 2002 Diamante.

1 Engine And Engine Cooling problem

Failure Date: 11/25/2010

The heater core is an extremely dangerous problem. The windows in the car fog up so bad I couldnt drive the car. . . Had to pull over and wipe the windows down. But the thing is. . . I didnt know what the problems was. . . Until I realized the windows werent just being fogged by the cold, ect it was a toxic mist from a heater core problem. . . I pulled over 2 times because I got sick. . . I noticed a mist coming out of the vents. . . . So all in all I called Mitsubishi and they refuse to do anything about this. This heater core problem can lead to accidents, sickness, and othe expensive problems in the car! the fumes are extremely toxic!!! there are 1000's of complaints and blogs about this problem. . . I'm sure there are 100,000+ complaints abpout this problem. And Mitsubishi refuses to help or do anything about this. I told them, is this gonna take a fatal accident for them to do something?" they replied, "im not answering that!" I told them that they should have recalled this problem. They replied, "sorry but your warranty is up we can't do nothing about it. " this heater core problems leads to faulty transmission problems, electrical problems, hazerdous problems, sickness, interior of the car can be ruined because anitfreeze leaks through the dash board. . . Where Mitsubishi placed the heater core. Made no sense to place a heater core above the electrical component of the transmission. They really messed up here and will not do anything about this. I think that the media should get involved because they probably wont do anything about if someone doesnt speak up!.

2 Engine And Engine Cooling problem

Failure Date: 10/15/2009

Heater core and o rings.

3 Engine And Engine Cooling problem

Failure Date: 09/19/2009

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.

4 Engine And Engine Cooling problem

Failure Date: 02/28/2009

Windows fogged up, smell of antifreeze and carpet is wet on front passenger side.

5 Engine And Engine Cooling problem

Failure Date: 02/02/2009

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.

6 Engine And Engine Cooling problem

Failure Date: 11/15/2008

The heater core of the 2002 Mitsubishi Diamante needs to be recalled and/or redesigned by Mitsubishi. As it is, just about every single post I see online about this car has the exact same problem. The heater is positioned directly above the car's computer , or ecu , and therefore causing problems with the engine, transmission, suspension, etc. . Read more...

7 Engine And Engine Cooling problem

Failure Date: 10/01/2008

There should be a recall, own a 2002 Mitsubishi Diamante. I just found out that the anti-freeze smell and the smoke coming through the vents is because the heater core has gone bad. The quote I received was for $1100. My antenna just stopped working on me also. It doesn't go down anymore, but the motor still sounds like its working. We are all having too many of the same problems. The company should be liable.

8 Engine And Engine Cooling problem

Failure Date: 09/19/2008

Heater core is leaking car only has 82,000k on the dash. As I have gone through various car forums and have come to realize this is a very common problem.

9 Engine And Engine Cooling problem

Failure Date: 08/08/2008

I bought my car used from the dealership, and drove about 200 miles before I realized the antifreeze smell as well as my windows began to fog. After reading the vast amount of heater core problems in the Mitsubishi Diamante, I decided to file a complaint. Antifreeze in the cab of the car cold lead to health issues and the consistent fogging of the windows can lead to little to no visibility. The windows will randomly become intensely greasy with antifreeze backup, this can happen at anytime when I am driving. I am extremely concerned about getting into an accident due to my visibility, and am getting my eyes checked out just incase the antifreeze has affected them. Thank you.

10 Engine And Engine Cooling problem

Failure Date: 08/01/2007

Just like everyone else with a 2002 Mitsubishi Diamante, I have had heater core problems. Antifreeze leaking/smell and windows fogging up. Cost to repair exceeds $1000. If every one of these vehicles has this same issue, why has it never been recalled? and why does Mitsubishi get away with all cars having this defect? and why has this investigation not resulted in action? is there another agency that can get recall action from Mitsubishi?.

11 Engine And Engine Cooling problem

Failure Date: 04/03/2007

Noticed faint smell of anti freeze approximately 9 months ago. Had problems with defroster clearing windows. Also, seemed to get better (or maybe I got used to the smell). Now noticed passenger side floor carpet is soaked with anti freeze. Obviously a problem with the heater core or the hose(s) which connect to it are leaking. Car has 92000 miles, and is well main.

12 Engine And Engine Cooling problem

Failure Date: 12/28/2005

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.


Other Engine And Engine Cooling related problems of the 2002 Mitsubishi Diamante


Fuel Economy of Diamante Vehicles
Diamante Service Bulletins
Diamante Safety Recalls