Just wonder who has had a heater core failure and who hasn't, I have have owned 3 3rd gens and two out of the 3 have failed, shame Mitsubishi did have the same type thats in the 2nd gens. I bet a lot of 3rd gens have been scrapped because of the cost to fix or replace the heater core.

Nope, all good with mine.

This has been done to death on these forums & any relevant info can be found using the simple search criteria, but anyway:

It's not so much the heater core itself, it's actually the OEM nylon o-ring seals that are the culprit almost all the time.
Heater cores are also replaced by some people, more-so as a precaution, so as to avoid doing a repeat dash removal & stripping out most of the interior if the heater core or associated components that weren't replaced happen to fail.

The original O rings were a nylon type that were prone to hardening & then cracking, causing leakage.
The revised part from Mitsubishi is a rubber based O ring that will last much longer & the coolant helps to prevent the rubber from hardening.

Heater core o ring failure on mine @ 120,000 kms but my car was 9 years old at the time.
From what I'm aware of, it's a very common thing to happen to magnas approaching 10 years or older.

This has been done to death on these forums & any relevant info can be found using the simple search criteria, but anyway:

It's not so much the heater core itself, it's actually the OEM nylon o-ring seals that are the culprit almost all the time.
Heater cores are also replaced by some people, more-so as a precaution, so as to avoid doing a repeat dash removal & stripping out most of the interior if the heater core or associated components that weren't replaced happen to fail.

The original O rings were a nylon type that were prone to hardening & then cracking, causing leakage.
The revised part from Mitsubishi is a rubber based O ring that will last much longer & the coolant helps to prevent the rubber from hardening.

Heater core o ring failure on mine @ 120,000 kms but my car was 9 years old at the time.
From what I'm aware of, it's a very common thing to happen to magnas approaching 10 years or older.

How sure are you they're revised? when did the revision happen? just that I'm not seeing a part number change in the catalogs. MR927776 that's the same number being sold now and the same fitted in 1996 models too.

OMG, 177 000k, 10 years 6 months. tick, tick, tick...................:eeek:

I would say about 90 % leak and all will eventually but then again you need to understand that some of these cars are reaching 20 years old and rarely is the core the issue is normally the seals and in older models the pipes. Still same result I guess

Oh and yes, they were revised years ago to rubber as ADM stated, I should know given the amount of these I have done.

I would say about 90 % leak and all will eventually but then again you need to understand that some of these cars are reaching 20 years old and rarely is the core the issue is normally the seals and in older models the pipes. Still same result I guess

Oh and yes, they were revised years ago to rubber as ADM stated, I should know given the amount of these I have done.

So the million dollar question. being a TW am I in the same boat or is the revision in question irrelevant and it's just going to happen anyway? Also I've read of removing the A/c system after degas, does this negate the dash removal or any tips there? dash removal only / best option/

I've been thinking about this this year just wondering if I should get it before it gets me?

I should have replaced my heater core, seals & piping when I installed a KJII upper dash loom to my TJ VRX to get the KE clock working. Had pretty much everything out bar the actual dash. I did think of it then and now regret not doing it now because I'm sure it will get me now as you say TW2005

How sure are you they're revised?

I'm sure becuse the replacement O rings were rubber & the OEM O rings I removed from my car (MY'03) were nylon and also because it's been discussed on here umteen times. See Madmagna's comments above (he sells them).



when did the revision happen? just that I'm not seeing a part number change in the catalogs. MR927776 that's the same number being sold now and the same fitted in 1996 models too.

OMG, 177 000k, 10 years 6 months. tick, tick, tick...................:eeek:

Again, see Madmagna's comments above. The improved rubber O ring uses the same part number as the earlier nylon unit which for obvious reasons isn't sold anymore.

I'm sure becuse the replacement O rings were rubber & the OEM O rings I removed from my car (MY'03) were nylon and also because it's been discussed on here umteen times. See Madmagna's comments above (he sells them).




Again, see Madmagna's comments above. The improved rubber O ring uses the same part number as the earlier nylon unit which for obvious reasons isn't sold anymore.

Well, that's interesting i would never had known had you not mentioned it. So with your's being 2003 sounds like even my 2005 is still going to have the old type.

thanks for the info

I had the core, elbows and o-rings replaced in the sedan about 3 years ago - not due to the failure of the core, but rather one of the elbows snapped.
As far as I know the wagon is still on its original core.

I Had the 'o' Rings and Elbow pipes replaced on mine about 2 months ago, using the revised parts....... ( mine is a mid 2004 TL) ... and had done around 178k at the time.
the core itself didn't need replacement.

Can't complain at that really considering the age.

At 12 years old, and 209,000km it doesn't seem like mine are leaking nor that they have been replaced.
Might swap them as a preventative measure

I Had the 'o' Rings and Elbow pipes replaced on mine about 2 months ago, using the revised parts....... ( mine is a mid 2004 TL) ... and had done around 178k at the time.
the core itself didn't need replacement.

Can't complain at that really considering the age.
how much did that cost?

13 years and 250,000 no problem yet. Wish I hadn't read this though, I thought it was just sigmas that had the inevitable dash removal hanging over your head.

Does using the genuine coolant and changing it regulary help to preserve these o-rings?

Generally there is no need to waste money on the core if the cooling system is in good condition

There is no benefit in using genuine coolant other than you pay a dealer a LOT of money for a bottle of 66% water and 33% coolant.........Does not matter how often you change the coolant either provided is done to the coolant makers recommendation

How sure are you they're revised? when did the revision happen? just that I'm not seeing a part number change in the catalogs. MR927776 that's the same number being sold now and the same fitted in 1996 models too.

OMG, 177 000k, 10 years 6 months. tick, tick, tick...................:eeek:
I'd like to know this too, when when when?
Which models started getting the rubber rings?

Generally there is no need to waste money on the core if the cooling system is in good condition

There is no benefit in using genuine coolant other than you pay a dealer a LOT of money for a bottle of 66% water and 33% coolant.........Does not matter how often you change the coolant either provided is done to the coolant makers recommendation

Just to get an idea Mal, what would you normally charge to fix a leaking heater core if just the elbows and seals need replacing?

See here, Deano

http://www.mitsfix.com/FixedPriceServices.html

See here, Deano

http://www.mitsfix.com/FixedPriceServices.html

Thanks for the link flyboy, that was awsome