NHTSA — Visibility: Defroster/Defogger System: Windshield: Heater Core Problems

2003 Mitsubishi Diamante (Page 2 of 2)


definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
40,837 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2003 Mitsubishi Diamante accessories - exterior problems

accessories - exterior problem

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2003 Mitsubishi Diamante Owner Comments (Page 2 of 2)

« Read the previous 20 complaints

problem #4

Jan 202006

Diamante 6-cyl

  • Automatic transmission
  • 52,000 miles


Steering wheel began to shake and visible fumes began entering vehicle through air vents. There was a strong stench of anti-freeze. Check engine light was on and vehicle became hard to control. After taking car to local dealership, I was immediately told, even before an inspection was done, that the heater core on vehicle had a slow leak that over the course of "several months" that eventually leaked on to the transmission electric box and shorted out the entire system. It seemed obvious that this was a familiar issue with this particular vehicle. I was originally given an estimate of $3,300, being that the vehicle was past its warranty period. After several calls to owner of dealership and doing research on this vehicles complaint history, the price was reduced 3 separate times, finally costing me $880. Apparently, Mitsubishi headquarters picked up the cost of the parts, leaving me to pay labor charges. The mechanic handling the repair stated that due to "poor design" on this particular vehicle, and even with our regular maintenance checks at the dealership, this problem cannot possibly be recognized or diagnosed in its early stages until it has caused extensive damage. Needless to say, this will be my last mitsubushi.

- New Orleans, LA, USA

problem #3

Mar 062006

Diamante 6-cyl

  • Automatic transmission
  • miles
Mitsubishi 2003 Diamante. Defroster/defogger : heater core windows were not clearing properly with defroster. Windows seemed to frost up and strong smell like burning wires. Found out that antifreeze was leaking into the passenger side of the car and heater core and seals need to be replaced. $900 to repair with 75% of this amount in labor! apparently this is a problem with these cars since 1998. The smell in the car can't be good for you and I feel nauseated and dizzy while driving. Have to keep the windows open in 32 degree weather in order to use the car. Dealer says the smell will remain for at least 2 weeks. Seems the manufacturer should do something about this ongoing problem.

- Pompton Lakes, NJ, USA

problem #2

Jun 152005

Diamante 4WD 6-cyl

  • Automatic transmission
  • miles
About a month and a half ago I noticed an odd smell in my car. Not realizing what it was I continued to drive my car. Then a week ago my car started to over heat because I didn't have any coolant. I also noticed a film on my windows. I have a mat under the car and haven't noticed anything leaking on to the ground. My car is a 2003 Mitsubishi Diamante with 59,0000. After having my car looked at further it is apparent my heater core has failed.

- St. Louis Park, MN, USA

problem #1

Feb 102005


  • Automatic transmission
  • 47,773 miles
Vehicle experienced a problem with the heater coil. Anti-freeze was getting into vent, and the vapors fogged up the windows, interrupting the visibility. Owner contacted the manufacturer, who refused assistance because the vehicle was out of warranty.

- Nashville, TN, USA

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