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Thread: Engine and cabin temperature issues

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  1. Engine and cabin temperature issues 
    #1
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    Hi All,

    Firstly thanks for taking the time to read my post.

    So I have a MK5 2005, 1.9TDI Golf. For the last year or so I've been struggling (especially in the winter at -6C) with a heater/engine temperature fault on my car. So I've noticed that the engine temperature used to reach 90C quickly and stay there, and never move, however now its all over the place. The heater in the cabin is intermittent, so sometimes it's hot, sometimes it will not get hot even if I rag the engine to within an inch of its life to try and get it hot. What seems to happen is, the heater will either work immediately and the engine temp will stay at the lowest point, or the heater won't work, the engine temp will go up then drop as soon as I get any heat into the cabin.

    I tested it today as it was mild but not freezing (7C) and the issue is still there after the summer. Does anyone have and idea why this is? the thermostat was replaced about 6 months ago and made not difference whatsoever!

    Many thanks in advance,
    F1Lane
     
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  2. Re: Engine and cabin temperature issues 
    #2
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    Sounds like an airlock stopping the water reaching the heater matrix. Its hard to say from the info.

    Sent from my SM-G950F using Tapatalk
     
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  3. Re: Engine and cabin temperature issues 
    #3
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    Also could be the heater vent mixing flaps working intermittently or the way the thermostat was fitted, there are some plastic fingers that hold it in place and these are prone to snap off when changing it, requiring a new housing.
    Removing and installing thermostat
     
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