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Thread: Mk7 Golf Heating not working

  1. #21
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    Quote Originally Posted by candellara View Post
    Hi chaps,

    We have exactly the same issue on our 2013 Golf GT TDI.

    Gurgling noise from behind dash. No warm air from heaters. Everything checked by VW - no fault codes on system and temp is stable at 90c

    Flushed the matrix and replaced the reservoir and cap. No issues for 6 months and then after a long motorway drive, gurgling noise, no heat from vents and water leaking from reservoir (although temp stable at 90c)

    A tech for VW in the States reckons it caused by the plastic impellers on the water pumps spinning on their shafts intermittently causing lack of water circulation (no heat from vents) and expulsion of water from expansion tank?
    Worth editing this as some further information has just come to light:

    As stated, 6 months ago (during a motorway drive) we lost heat to the vents and we had gurgling noises from the dash. The car was subsequently booked into VW and their diagnosis was that there are no fault codes present but was is common on MK7 Golfs was that the silica bag in the water expansion tank ruptures and blocks the heater matrix. Price to rectify 819 for new matrix.

    I didn't believe them and was a bit miffed that they hadn't tried to flush the system so i took the car away. I disconnected the hoses from the matrix at home and flushed with a hose and water was flowing freely. Upon reconnecting & top up, heat from the vents again!! The car only does local town driving and everything has been well for 6 months UNTIL, a recent motorway drive. Same symptoms, no heat from vents, gurgling noise and some water being forced from expansion tank on this occasion.

    After returning home, i ordered a new expansion bottle & cap - very low cost and really to eradicate these items from being any cause. After fitting and checking, we have heat again from the vents.

    Well, today i opened up the old expansion tank with a saw - and, the silicant bag is not rupted and fully intact with all of it's crystals!!!!! Now this is becoming farcical as the amount of threads there are all over the forums about this exact problem and VW continuing to replace heater matrix's. One poor lady has had 3 heater matrix's as the VW dealer insists that the silicant granules have contaminated the system and continue to block the new heater matrix's. Indeed my local VW dealer wanted to relieve me of 819 for replacing the matrix - when we know the matrix isn't blocked.

    Don't know where to go with this now but the VW technician in the States reckons it's a problem with one of the two electric coolant pumps (with plastic impellers that end up spinning on their shafts)

    Any thoughts?
    2013 Golf GT 2.0 TDI-CR

  2. #22
    Administrator Crasher's Avatar
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    It isn't complicated; there are two main reasons for poor heater output. Firstly the matrix is so small they had to make the capillaries tiny and so they block easily and you cannot effectively flush it clean, it will just silt up again. What we do is blast the system clean with the pressure wash and I mean clean! Then we fit a new matrix (genuine) and we refill with G13 and that NORMALLY gets the heat flowing. The other problem is the electric heater water pump and the intercooler pump, these are both very prone to failure and failure of either causes cavitation in the system and.... gurgling noises... The water pump impeller issue is OLD, that was years ago.
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  3. #23
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    Quote Originally Posted by Crasher View Post
    It isn't complicated; there are two main reasons for poor heater output. Firstly the matrix is so small they had to make the capillaries tiny and so they block easily and you cannot effectively flush it clean, it will just silt up again. What we do is blast the system clean with the pressure wash and I mean clean! Then we fit a new matrix (genuine) and we refill with G13 and that NORMALLY gets the heat flowing. The other problem is the electric heater water pump and the intercooler pump, these are both very prone to failure and failure of either causes cavitation in the system and.... gurgling noises... The water pump impeller issue is OLD, that was years ago.
    Thanks Crasher

    I'm sceptical whether ours is a matrix issue and the reason i say that is that the silicant bag in the old expansion tank was not ruptured and the water / tank is spotlessly clean - just clean G13 pink coolant. Also, since the recent gurgling episode, both pipes to the matrix are piping hot and heating fully operational

    It would appear that it's only when we have the gurgling noise that we experience a heater issue. Could it be an intermittent issue with the electric heater pump or intercooler pump (or one of these is inoperative) that only surfaces during long runs? Although there are no fault codes to report on the system
    2013 Golf GT 2.0 TDI-CR

  4. #24
    Administrator Keithuk's Avatar
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    You can Google granules in cooling systems VW.

    Found these swimming in coolant reservoir...

    VW coolant silica bag.

    Coolant silica bag, to remove or not?
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  5. #25
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    Quote Originally Posted by Keithuk View Post
    You can Google granules in cooling systems VW.

    Found these swimming in coolant reservoir...

    VW coolant silica bag.

    Coolant silica bag, to remove or not?
    Thanks Keith

    I've replaced the expansion tank & cap just to eradicate them as a cause. Interestingly, i cut open the old expansion tank and the bag of granules was inside - fully intact. So i have ruled out this silica bag bursting causing the matrix to block
    2013 Golf GT 2.0 TDI-CR

  6. #26
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    Well we've covered about 400 miles since the car's last "motorway" episode

    No loss of water, no heating problems - car is running fine.

    Again, because of this - i still dispute VW's diagnosis of the heater matrix. Glad i didn't part with over 800.

    I'll keep the thread updated as and when (and if) we get further trouble. Worth noting that after the car's last issue - i did change both the expansion tank and cap as they were so low cost it was worth fitting new parts just in order to rule them out
    2013 Golf GT 2.0 TDI-CR

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