really awful
Typical Repair Cost:
Average Mileage:
119,350 miles
Total Complaints:
8 complaints

Most Common Solutions:

  1. not sure (5 reports)
  2. Mitsubishi TSB 09-55-002 (2 reports)
  3. replace heater core (1 reports)
2004 Mitsubishi Endeavor AC / heater problems

AC / heater problem

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2004 Mitsubishi Endeavor Owner Comments

problem #8

Jul 072018

Endeavor Limited 3.6L

  • Automatic transmission
  • 161,000 miles


Driver side floor board is SOAKED!! I thought I hear like a slight squish sound as I am getting out of my 04 Endeavor but, I chose to blow it off. About a week or so later I notice the driver side floor board looks wet. I look and OH NO..... it's soaked. I also now hear a motor humming sound every time I start my vehicle.

- nmariscal, Bradshaw, US

problem #7

Jun 102015

Endeavor L 3.8L V6

  • Automatic transmission
  • 79,000 miles

Began noticing in summer of 2015 - driver side floor carpeting was very wet - progressively got worse throughout summer when A/C was being used - floor was now soaked most of time - sopping soaked. Brought to a dealership - not Mitzubishi - and they said it was heater box clogged w/debris - needed to be cleaned out and that would solve problem - they completed job - next day when I used A/C driver side carpeting was soaked again!

Called that dealer and told them they did not fix problem - service mng would not make good on it - said they did their job and cleaned out debris. Would never use them for service ever again. Then I called the Mitzubishi Dealership - service mng was very familiar w/this problem - said many owners of my vehicle were all having same problem - they figured a way to fix it by drilling holes in heater box? They said it would stop the water from coming into vehicle. They said they were using this method as a solution to the leaking problem on all these vehicles. So brought it in to Mitzubishi to repair - they said they cleaned heater box again and drilled the holes - STILL NOT FIXED! Worse than ever now - it's a year later and now it's driver floor AND passenger floor are both soaked ALL THE TIME! It stinks like mold in my car. Now it is Jan 2017 - paid twice to have this repaired and it is still NOT FIXED! Now windows are always fogged out w/condensation from the extreme water leaking into car and carpets are actually icing up! So mad - will NEVER EVER buy another Mitzubishi product. We have had major problems w/this vehicle - we have found out many many owners of the 2004 Endeavor have had all the same issues - these should have been recalled repairs!

- seiferts, S.Dartmouth, MA, US

problem #6

Jun 272016

Endeavor 3.8L

  • Automatic transmission
  • 142,000 miles

Really sucks pool of water on driver floor side, my job now is to use a bath towel to get rid of but i have to buy more for this problem any solution pliz advice, Recall pleaz i am getting frustrated.

- Thomas M., Topeka, KS, US

problem #5

Jul 012015

Endeavor XLS 3.8L V6

  • Automatic transmission
  • 200,000 miles


So after a failed attempt at renting a car I had to break and use my damn endeavor to travel down to Disney world. Had a great time myself but my car seemed to hate it. On our way back I noticed a sickening sweet disgusting odor and my floorboards were soaked on both sides. My girlfriend put a bag on the floorboard and it had a brown stain on it. Talked to my mechanic when I got back and realized it was the heater core. This thing is literally leaking antifreeze all over my car and you can now hear and see the flow of antifreeze sloshing around. Finally getting it fixed after $750 later. It's not really the cost of the part itself but the cost for the labor. You literally have to take apart the dash. Leave this to the pros or junk it.. I think it's time to sell or junk this piece of sh*t off the side of the earth. I'm over this damn car. I'M OVER IT!!

- Travis D., Corydon, IN, US

problem #4

Feb 042013

Endeavor LImited 3.8L

  • Automatic transmission
  • 80,000 miles

Just of the blue my car starting smelling like old water and a few days later when I got it it was like stepping in a puddle of water. After sucking it out I figured it was a one time thing but then a few days later when trying to press brakes my foot slips from the floor beening wet again.

- Peter L., Prairieville, LA, US

problem #3

Jul 172013

Endeavor AWD 3.8L

  • Automatic transmission
  • 117,000 miles

Well if you made it this far and are reading this then the chances are you have water leaking into your drivers side floor boards. I have been around various car problems however this one was the most baffling. Anyway if you are not convinced of the problem here are the symptoms. You will notice a "swooshing" sound of water when you stop and accelerate as this is the water running back and forth underneath the floor boards. In addition, over time the water level will rise and you will notice your rugs underneath the drivers side having standing water. In my case I noticed the swooshing noise several months before the issue became apparent with actual water soaking the rugs. In doing what your doing right now (reading blogs, complaints, etc...) I found several sites that posted similar issues among Endeavor owners. In my particular case the water leaks even when the air condition is not running. I think that is due to so much water already retained from running the air condition that by now tank or whatever is holding all the water is overflowing and the blower is just forcing whatever water is in the tank out into the interior. The sad thing is it seems as if there is no easy fix. There are several TSB on this from Mitsubishi and it seems that depending on your make or model it will determine if this is a $50 fix or a $1000 fix. Apparently the AWD models configuration may not allow easy access to the drain hole so that it can be snaked free of debris or cleared with pressure. But each mechanic is different and you may get lucky. If not then it means taking apart the dash and disassembling the HVAC unit. It is just extremely frustrating that along with the financial burden the health and safety risks that this problem has not been addressed via a recall. To this point I was fortunate with this car and was even thinking that my next SUV would be a Mitsubishi. But after seeing how Mitsubishi Corp is handling this then I will definitely think otherwise.

- Rob O., Philadelphia, PA, US

problem #2

Mar 102012


  • Automatic transmission
  • 90,000 miles

When this problem started I did not have a clue what was wrong. Not long after the problem started my ac quit working. I took it to Mitsubishi and they replaced the condenser so I thought my problem would be solved. No! So I spend $800 and they didn't even unclog the tube that is causing the leak. I moved out of state right after and haven't been able to take it in to get it fixed. It is ruining my car. I live in Florida and no AC is not an option. I soak up the water with beach towels. Depending on the day it will soak 2-3 beach towels ringing wet. That's a lot of water coming in. I dread having to fight over this! Ugh!

- R M., Jupiter, FL, US

problem #1

Jul 232010

Endeavor LS AWD 3.8L

  • Automatic transmission
  • 85,465 miles

The have many models with a/c leaking inside, If you look at TSB-09-55-002 the last page of three says to only repair on a complaint basis only.This is a design flaw not a warranty issue ! You do not put a a/c evap. inside the vehicle. This is asking for water problems. The leak grew mold before we discovered it and made my wife very sick. She had bronchitis for two and a half months.It took many dr. visits and three different antibiotics before she got better. Little did we know her truck was making her sick.

I just went to the dealer for the fourth or fifth different recall issue and explained the problem while I was there. Mitsubishi acted like the didn't know about this and declined to fix it because it was out of warranty. Like I said, this is not a warranty issue it is a design flaw that is making people sick. Everyone in my family either has asthma, allergies, or both. We can't run the the A/C for fear of more mold and mildew growing.

All you have to do is to google Endeavor a/c water leaking to see how wide spread the problem is. There are other models with the same issue. The problem is a health risk for people with respiratory problems as well as the water will rust out the floor boards making it a safety issue as well ! Something has to be done about the way Mitsubishi is handling this problem. They are well aware of it and are dodging their responsibility to step up and do something about it. I AM NOT DONE YET !!!!! RECALL THIS TRUCK.....!!!!!!!!!!!

- David C., Gainesville, VA, US

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