Structure Problems of Mitsubishi Diamante

I have a 2002 Mitsubishi Diamante. I have kept regular maintenance. I am submitting this form because of a heater core issue I am having. However I have had the following problems with this car. All these problems seem to be recurring problems that happen to many people with this model. At least that is what I find when I search the issues on the internet 1- vibration in steering wheel --this happened multiple times after taking car back to dealer-it appears there is a known issue with the rotors in this car. After having the rotors cut twice by the dealer with no long lasting success. I had to have the brakes and rotors replaced by a mechanic ( car had less the 10,000 miles when issue started happening) 2- rusted muffler--not sure if this issue happens often but after 23,000 miles I had to have my muffler replaced because there was a hole rusted through the top of it-I was told this could happen for not using the car very much in the winter time( road salt can cause the rust) 3- heater core- I know have a heater core problem in this car. I have antifreeze leaking in passenger compartment. I have an antifreeze smell in the cabin of the car. My windows fog and the defroster will not clear the windshield ( makes it worse). I am low in antifreeze because of this. My service engine light has now come on and I am told this can be caused by leaking antifreeze onto the computer which is positioned under the heater core. This issue is widely reported on the internet in many forums and seems everybody with a Diamante will eventually have this problem. I am being told this repair can cost over 1,000 dollars 4-I have had to replace 3 sensors in the engine 2 egr and 1 idle sender (cost around 1,500 dollars). This may or may not be because of the heater core issues causing the cars computer to fail.

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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.

For the past two years our car has had a very pungent fowl smelling odor when the air conditioner or heater is engaged that has gotten progressively worse. I took the car for repairs prior to the termination of the warranty and was told (by the dealership) that they did not notice a smell, and there was no problem. Six moths ago the car began to run hot and I took the car to our neighborhood mechanic. Under pressure he noticed a small leak in the coolant piping and replaced a section of pipe ($150. 00). I asked if this could be causing the odor (as mentioned earlier and he stated maybe, or it could be the heater core). Within the past two weeks the 'check engine soon' light has come on and upon checking the message and inspection of my car I've been told the heater core needs to be replaced. My neighborhood mechanic was at a loss because told me it was very odd for the heater core to fail so early in a car. I've checked the internet and have come across hundreds of people in the same situation (with Mitsubishi's). I am very upset with the fact that the Mitsubishi dealer may have lied to me (when the car was under warranty). I asked for multiple items to be fixed (under warranty) and they refuted every request. The heater core will be replaced within two weeks.

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The paint on the roof and trunk deck of my 1997 Diamante is fading with white patches. The hood and body paint looks good as new. I waxed my vehicle at least 3 times a year. Is this a defect from the factory I have notice several similar models with the same problem. What should I do about the problem?.

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