15 captured repliesPartial discussion capture · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHNeed to replace heater matrix/core
Reported or suspected cause
heater matrix
Reported cause
No successful repair reported for this finding.
1
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0
Suspected cause
0
Reported fixes
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Reported cause · Original poster
I recently had a major service and the specialist seemed fairly sure it was the heater matrix.
Leading evidence: 'heater matrix' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'heater matrix' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Check coolant warning and it looks like i need' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
I've been having steamy windows, a smell of coolant and an intermittent check coolant warning and it looks like I need to replace my heater core.
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
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Suggestion · Original poster
Is it an absolute must to suck out and replace the coolant?
Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.
Discussions that contain suggestions
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Suggestion · Original poster
I've been having steamy windows, a smell of coolant and an intermittent check coolant warning and it looks like I need to replace my heater core.
Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
911uk: 1 discussions
0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.
0 acknowledgements have no verified action link; they do not establish a repair result.
Generation: 20261027T053112Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I've been having steamy windows, a smell of coolant and an intermittent check coolant warning and it looks like I need to replace my heater core. Probably looking at around £600 for the specialist to do it.
Has anyone done this themselves or have access to a guide?
I'm fairly novice when it comes to car DIY - have done some basic jobs like brakes / MAF replacement. Looks like you can get access from the frunk only and I'll need to drain/vacuum the coolant and replace it which is new to me.
Thanks in advance.
Thanks for this.
Do you think it's a job that can wait then? It certainly doesn't cause me much of an issue day to day; just the very occasional misting and heat, which kind of helps in the winter months. I guess coolant leaking about isn't ideal.
Maybe i'll wait for the summer too. Was thinking of sourcing a used part possibly. Is it an absolute must to suck out and replace the coolant? If this requires expensive parts, I might be better going wth the specialists.
Sorry, I'm a bit of a novice!
No coolant loss except what's in the heater matrix - that's what the clamps are for in the description above.
Heater matrix is only £70 new:
https://www.ebay.co.uk/itm/Porsche-911-996-Boxster-986-Heater-Heat-Matrix-Exchange/153743194218
You will also need a new foam panel that seals the heater box / matrix .
Fitting the new one of these is just about the hardest part of this job .. its sticky and unless you are careful it sticks to the bodywork it touches .
It's a very easy job and you will have no trouble .
Just to confirm though .. do you have steamed up windows on the inside when the car warms up and possibly a sticky residue on the windscreen ?
That's the normal type of symptoms for this .. if you are putting a pint of coolant in per week then it won't be this part as a leak from the matrix goes into the car and will soak the carpets .
Thanks for this. I recently had a major service and the specialist seemed fairly sure it was the heater matrix. I've definitely been having steaming on the inside of the windows, which made think the air con was on its way out initially, and occasional blasts of heat. The carpets don't seem wet but there is a sweet smell in the cabin that the specialist noticed more than I did TBH.
Where can I source the foam panel? Thanks again.
Some great pictures there which will really help. I will take this job on I think. I have another car if I get stuck at least!
I don't fancy removing an air-con pipe, is that a must?
Cheers,
Dave
Halfords can degas and regas so it's not a problem .. new seals are best though.
I would think actually getting the matrix out and past this pipe might be a struggle if not removed .. to be honest it's been years since i've done this so i'm unsure but a quick trip to halfords will get the gas out if needed .
Think of the labour saving .. also think of the fun in doing this job .. it's a challenge .. well worth a diy instead of having someone like me doing it and my garage charging you for the pleasure .
It's an achievement and worth the effort imho .
Thanks for the advice, I'll give it a go, take some pictures and report back. All part of the fun! First off I'm removing the front bumper on Monday to clean out the crud. Should be satisfying.
Planning on taking this job on shortly, particularly if I get isolated! Do you know where I can source the foam panel? Haven't had any luck via Google but probably using the wrong search terms.
Thanks in advance. Will post some project pics when I get underway.
OPC. They're usually pretty good on price. If not then probably rosepassion.
https://www.rosepassion.com/en/diag...657226302-p95513-gasket-left-hand-drive-95513
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