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Heater blowing cold/luke warm

Discussion in 'A4/S4 forum(B5 Chassis)' started by griswold, Oct 31, 2010.

  1. griswold
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    griswold Member

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    Hi the heaters on my A6 2.4 are not getting hot
    just luke warm.
    The temp gauge is sat at 90.
    So what should i check first?
    would a flush help? heater core blocked?
    if its the stat would gauge be showing 90?
    if i change the stat might as well do timing belt at the same time
    so cheap fixes first
    asked here as quite a few a4 2.4 about
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  2. Nez
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    Nez Member

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    Water pump man.
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  3. Fraser
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    Fraser Member

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    got the same today on my a4 1.8t sport

    heater blowing ok, but no heat from the heater, very luke warm.

    why would it be the water pump? whats the connection?

    ta
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  4. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    if it was the pump i'd expect it to overheat?

    Does it have climate?
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  5. griswold
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    griswold Member

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    On my 2.4 turned out to be the stat but had new timing belt and water pump done
    but it still not as hot as my 1.8 gets but much better after all the work
    but the temp used to vary but the slower the heater blower the hotter it got
    is yours hotter with the blower on a slow speed?
    #5
  6. Fraser
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    Fraser Member

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    has climate aircon

    there is a trickle of heat on low fan speed

    just had new thermostat done approx 1500 miles ago. oil and water temps all ok from the gauges

    car is on 158000 now

    cambelt kit was done at 119000 by awesomegti - but can't tell if they replaced the waterpump at that time - remember asking for it but their receipt does not mention it - will call them tomorrow to see.
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  7. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    I spose back flushing the heater matrix won't hurt .

    Usually with WP failure you find it idles ok temp wise,until you load the engine up and it starts to get too warm
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  8. Fraser
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    Fraser Member

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