Question about 1999 Mitsubishi Diamante

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How to replace heater core in 2001 diamante.

When heater is working the inside od windows frog up.

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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

Posted on Feb 02, 2009


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00 mitsubishi have antifreeze smell inside while driveing

That would be a leaking heater core.It will need to be replaced.

Feb 13, 2013 | 2000 Mitsubishi Diamante

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What's a heater core

Heater core is like a radiator. Blower motor blows through the heater core and heats your car up.

Jan 10, 2013 | 1995 Mitsubishi Diamante

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Heater core leaked and car wont start now

I'd steer clear of this one. The starter problem could be anything, regardless of what he 'thinks'. It could be a starter, it could be wiring, it could be the ignition switch, or it could even be the relay (the cheapest and easiest to replace, which is why I suspect he 'thinks' it's the problem).
The heater core is your greater concern. There are no o-rings in the heater core itself. If the heater core is leaking it must be replaced. There is a heater shut off valve under the dash and there may be o-rings where that is plumbed in. The actuator for the heater shut off valve is reportedly prone to failure. In either case, heater core or shut off valve, it's a pain to get to, requiring dismantling or removing the dash, and will probably be quite expensive to replace unless you're really handy and mechanically inclined.

Aug 08, 2017 | 2001 Mitsubishi Diamante LS

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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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I have a 2003 mitsubishi diamante ...the car has been nothing but kind of disappointed in my mitsu-experience..well anyways i guess the diamantes have faulty O-rings located inside the...



Feb 24, 2011 | 2001 Mitsubishi Diamante

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No heat heater core leaking there was little to no air flow

if the heater core is leaking,it could have built up sediment inside and has the flap inside stuck,sounds like you need to replace the heater core and check the duct work

Jan 01, 2010 | 2001 Dodge Ram 2500 Truck

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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

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

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

Feb 01, 2009 | 1999 Mitsubishi Diamante

2 Answers

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

1 Answer

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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