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Burst silica bag - can't get it solved

Colin_v40

New member
Location
Hampshire
Car(s)
Golf mk7 Estate 1.4
Hi,

I'm new to this so I hope I'm doing this right. I have a 2013 Mk7 1.6TDI golf. My heating stopped working about 5 weeks ago and I took the car to a mechanic who found it was a burst silica bag. To fix this, he replaced the heater core and flushed the system thoroughly, until he was sure it was clear. The overflow tank and thermostat were also replaced, to be on the safe side.

Having done this, I took the car back but the heating hasn't been working right since. I've had it back several times and now, having tried everything else, he checked the heater core again. And, once again, there's silica in it. A small amount, nonetheless enough so that the heat is only working on one side of the car.

I'm wondering if this is a problem that anyone has had success fixing. Will the heating in my car ever work correctly, and is it even possible to ensure that all the silica has been removed from the system? I can't see myself holding on to this car for too much longer if this is going to be an ongoing problem.

P.s. why has this problem never been addressed by VW? Clearly, many people have fallen victim to it and yet, there's no recall and no advice to change/remove silica bags, despite this being relatively widespread.

I'm really at my wits end with this, and it's already cost a lot of money, so any help would be appreciated.

Thanks.
Hi.
My heater stopped working too. 2014 model.
Took it to my mechanic who drained system, removed and flushed coolant tank, replaced heater matrix and water pump. Bloody silicon had blocked up the heater matrix and pump. All flushed through, silicon bag removed and engine now running at correct temperature and heater working better then ever.
Total cost over £800. Absolutely distasteful that VW can get away with this. I'll never own another one. Been one of the worst cars I had had for reliability. Marginally worse than the Volvo before it.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
Hi.
My heater stopped working too. 2014 model.
Took it to my mechanic who drained system, removed and flushed coolant tank, replaced heater matrix and water pump. Bloody silicon had blocked up the heater matrix and pump. All flushed through, silicon bag removed and engine now running at correct temperature and heater working better then ever.
Total cost over £800. Absolutely distasteful that VW can get away with this. I'll never own another one. Been one of the worst cars I had had for reliability. Marginally worse than the Volvo before it.
That silicon bag should be warranted for life. I've read too many stories like yours. I was going to remove it myself but I'm afraid I would break it trying to get it out.
 

IWMTom

Drag Race Newbie
Hi.
My heater stopped working too. 2014 model.
Took it to my mechanic who drained system, removed and flushed coolant tank, replaced heater matrix and water pump. Bloody silicon had blocked up the heater matrix and pump. All flushed through, silicon bag removed and engine now running at correct temperature and heater working better then ever.
Total cost over £800. Absolutely distasteful that VW can get away with this. I'll never own another one. Been one of the worst cars I had had for reliability. Marginally worse than the Volvo before it.
It's not silicon that blocks the matrix, it's the casting sands from when it was manufactured. Very common fault.
 
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