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Old 01-04-2016   #31
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Re: HEATER Matrix unit removal

davefridge , the heating radiator it's made off plastic , aluminium and some sealents , so, it's resistant to corrosion , and if we change the liquid regulary there are not many chances of deposits that make the radiator to obstrutc stoping it to heat .
the thing is , like as been said before , it does many cycles of heating and cooling , so the materials expand and contract so many times that eventualy they crak...
or , like as also said before , " it's the greemlins"
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Old 02-04-2016   #32
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Re: HEATER Matrix unit removal

Davefridge, in addition to what JMSG said, a very common failure mechanism is pollen, seed, dust, leaves etc. getting through a damaged/missing pollen filter and forming a moist organic sediment to the bottom of the heater against the heater core. I've seen this happen a few times with different cars, and in these conditions the heater core will corrode quickly. So, if you have pollen or dry seeds flying around your cabin when you turn your heater blower to full blast, it's an indication that things are going to get ugly pretty soon.
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Old 04-04-2016   #33
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Re: HEATER Matrix unit removal

As soon as I have a chance I'll fill my old rad with water under pressure to see exactly where it leaks. It looks in good condition and it is clean looking. I don't remember seeing natural debris but it might well be the reason. I'll do the video as well. We have horrible weather at the moment and work is busy so as soon as the sun is out again and I have minute, I'll do it.
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Old 04-04-2016   #34
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Re: HEATER Matrix unit removal

no rush ! just take your time
in the mead time i have found the service manual at the forum and i download it, top information
just found what i was looking for !!! and much more !
i have printed the most usefull parts to have in hand wen doing the job .
GREAT FORUM
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Old 09-04-2016   #35
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Re: HEATER Matrix unit removal

Finally! She's back on the road. First job was to get the AC refilled. That was easy - and cheap and all is working fine. Apart from:
1. The rev counter keeps dropping to zero - must be a connection so I need to take the pod out. Again..
2. The right painted interior panel is squeaking so that needs looking at.
3. The new mats I bought from Ebay are terrible. They slide all over the place so I have to stick them down with double-sided tape..

We only drove about 40 minutes but the car feels very different with the sound insulation. Feels more solid and of course there's less noise from underneath. A worthwhile improvement I reckon (total cost was about 120 - all from Amazon.co.uk). The car was out of the garage for the first time in 5 months, all clean and gleaming, then we had the first hailstorm of the year.. The stones weren't too big so the car is fine and we did manage to get the storm cover on it.

Photo: Getting the gas refilled. Just 55!
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Old 10-04-2016   #36
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Re: HEATER Matrix unit removal

Quote Originally Posted by Ilkka View Post
Davefridge, in addition to what JMSG said, a very common failure mechanism is pollen, seed, dust, leaves etc. getting through a damaged/missing pollen filter and forming a moist organic sediment to the bottom of the heater against the heater core. I've seen this happen a few times with different cars, and in these conditions the heater core will corrode quickly. So, if you have pollen or dry seeds flying around your cabin when you turn your heater blower to full blast, it's an indication that things are going to get ugly pretty soon.
Pollenfilter? I didn't know we had such advanced items! where's that hidden then?
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Old 10-04-2016   #37
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Re: HEATER Matrix unit removal

https://www.fiatforum.com/barchetta/...barchetta.html

Looks like there is no filter on non-AC barchettas. That may be the reason these heater cores are so prone to fail.
On cars equipped with AC you should find it under the windshield wiper panel, between the intake grilles and the heater motor.
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Old 11-04-2016   #38
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Re: HEATER Matrix unit removal

Ah! That's interesting.. When I was having the AC refilled the mechanic asked if I'd changed the pollen filter. I thought he was nuts. I'll check it tomorrow and report back. My car does have AC and the matrix still went. It's a small hole in one of the tubes.

On a different matter - anyone know why my gears crunch (not too badly) only at high speed going up from 2nd to 3rd. Doesn't seem to do it on other gears. THANKS!
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Old 11-04-2016   #39
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Re: HEATER Matrix unit removal

I just checked, my car that has AC, doesn't have a pollen filter.. just a hole straight down to the fan. I have to go to a spares shop tomorrow so will ask if they list anything.
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Old 12-04-2016   #40
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Re: HEATER Matrix unit removal

Nice picture richit. Where is it?
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Old 12-04-2016   #41
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Re: HEATER Matrix unit removal

Sorry! It's not too obvious. It was late...
It's what you see under the panel between the windscreen and bonnet where the wiper motors are.

Here's a better photo:
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Old 12-04-2016   #42
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Re: HEATER Matrix unit removal

I went to a motor spares shop in Torino this morning and they said some Barcha have pollen filters, some don't.. Here's a photo of the parts book. What determined when a car would have one I've no idea...

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Old 12-04-2016   #43
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Re: HEATER Matrix unit removal

Thanks for extra photo. I gather that only Bs with aircon have the filter fitted. Cant see where it would go. It can't go under the grill fitted to top panel because it would get wet! Also can't see how it would fit over the fan intake because there doesn't appear to be any sort of holding frame.
Can anybody shed any light on this?
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Old 12-04-2016   #44
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Re: HEATER Matrix unit removal

Mine does has Aircon so it can't be the criteria for having a filter. On the diagram in the spares book it shows in the speech bubble that it is exactly above the hole for the fan so some cars must have a slot so the filter slides in over the hole. Maybe just for some countries..? I checked on the Italian forum and they were almost making death threats to each other over the question - so I wont go there..
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Old 13-04-2016   #45
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Re: HEATER Matrix unit removal

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