Question about 1999 Mitsubishi Diamante

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The best way to replace a heater core on a 2001 Diamante car.

My 2001 Diamante windows frog up when the heater is working.

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I think the steps to replace the 'heater core' are a few too many to list here- sry and it is a pain to do in most vehicles- im not familiar on the exact steps on the particular veh. Best thing to do is get a repair manual and follow its guidance on removal and reinstallation of the heater core. Good Luck

Posted on Feb 02, 2009

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Heater on my 1999 Mitsubishi Diamante does not blow hot


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I have a 2003 Mitsubishi Diamante LS and the front windshield has started fogging up (from the dash upwards) My brother says it could be the heater core. If so, what are the symptoms, where is the heater...


Symptoms of a damaged heater core is moisture and the odor of coolant in the cabin as well as the possibility of coolant puddled in the passenger floorboard. The heater core is inside the dash and requires removal of the dashboard assembly in most vehicles. Unless you are comfortable with a large amount of work disassembling the dash, I would refer this to a competent mechanic.

Jun 01, 2011 | 2003 Mitsubishi Diamante

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Best or easiest way to change heater core on a 2001 accord


If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired.
Heater Housing
  • The heater housing is usually under the dash and must be removed to gain access to the heater core.
  • Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
f74-01.gif The heater housing is disassembled to get to the heater core. Heater Core
  • Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
  • Remove the heater coolant hoses.
  • Remove the cable and/or vacuum control lines (if equipped).
  • Remove the heater core securing brackets and/or clamps.
  • Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
  • To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.

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2001 jeep cherokee- had the heater core replaced in Feb. 2008, when you turn on heater barely any air, when you use defrost a snell and the windows fog up. When you turn off car sounds like ******* comes...


Sounds to me like the heater core is leaking again. If you're smelling antifreeze and the window fogs up then you're getting coolant into the heating system. Most likely cause is leaking hose to heater core or the heater core it's self.

Dec 05, 2009 | 2001 Jeep Grand Cherokee

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How to change it a heater in a 2001 mitsubishi diamante


Why do you think you need a heater? Has the fan stopped blowing or are you referring to the need to replace the leaking gasket in the heater core?
If you take it to a mechanic for the heater core gasket, you can expect $1200-$1400 just to replace a $0.80 part. It is very labor intensive but can be done yourself if you have about 6 hours.

Nov 19, 2009 | 2001 Mitsubishi Diamante

1 Answer

How to replace heater core in 2001 diamante.


Your best bet is to get a repair manual from the local Auto Parts store and follow the instrutions in it, There are too many steps to list here, Sry but thats my best advise

Feb 01, 2009 | 1999 Mitsubishi Diamante

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Heater core mitsibishi Diamante


I have a detailed write up but it is too long to post

Send me an e-mail I can send the write up to

Jan 14, 2009 | 2003 Mitsubishi Diamante

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What is the easiest way to replace the heater core in a 2002 mitsubishi diamante


2002 diamante heater core sits in center of the dashboard just over the on board computer for the car. To access it you need to take out the console between the seats and the entire dashboard to get to it. The only thing wrong with the heater core is the leaking gaskets (about $10 in parts). Mitsubishi knows about the problem and when the dash is taken apart you will see a plastic sheet over the onboard computer to somewhat protect it from the leaking heater core gaskets. So the expense in the repair is in the labor to get it all apart and back together again. The dealers seem to replace entire heater core when they fix this problem. I did just the gaskets and that solved the problem. I have read others who did it themselves only replaced the gaskets and that solved it for them as well. Maybe the dealers think you will feel better replacing a larger part for so much labor.

Sep 28, 2008 | 2000 Mitsubishi Diamante

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