1997 E36 Z3 heater not working! Any ideas?

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  1. 1997 E36 Z3 heater not working! Any ideas? 
    #1
    Bimmer Fan
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    TimZ3's Car Details
    Model of Car:
    Z3
    Year of Manufacture:
    1997
    Transmission Type:
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    Hi,

    i'm new to this site and this is my first post. I've got a problem with my little Z3. It's a 1.9 1997 model. Recently the heater has been playing up. only actually providing hot air on the very odd occassion. more recently though the best it can manage is a very luke warm at best and even more recently, no hot air at all.
    any ideas what this might be? If it's thermostat. how can i check this and is it easy to replace myself?

    Thanks in advance.

    Tim
     
     

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    #2
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    GordonJ's Car Details
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    318ti E36 LPG
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    Could be thermostat, could also be low on coolant. Have you checked the coolant level?

    Could also be a knackered water pump.
    .
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    De Omnibus Dubitandum
     
     

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    #3
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    TimZ3's Car Details
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    Coolant was low but i have topped up today. sat it on drive way with engine running and the air didnt feel any warmer. will i be able to tell from this or is it worth giving it a good run (around the ic currently looking menacing outside)?

    cheers
     
     

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    Moved to the Auto Electrical Forum
     
     

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    #5
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    Ferret's Car Details
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    You said it was low on coolant, now you've topped up...

    So to me, that suggests you've got an airlock... Do a search on how to bleed the engine.
     
     

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    Check the temperature of the pipes that run to the heater tap(s) and the pipes that run to the heater matrix, if the pipes are hot that go to the taps but not after the taps then you need a new heater control tap.

    You should also ensure the cooling system is bled correctly.

    How to bleed the cooling system.
    1.Jack the front of the vehicle up onto stands as high as possible,
    2.Turn the ignition on,engine off,heater on fan setting 1 and temperature fully hot,
    3.Remove the rad cap/expansion cap,remove the bleed screw from the radiator and IF you have them the bleed screw(s) from the thermostat housing/top hose, return pipe or EGR thermostat.
    4.Fill the radiator up and keep pouring till there are no more air bubbles coming out from the bleeds, using a funnel that fits tight in the radiator neck and filling it full of water will help push any troublesome air out, when good you can then install the bleeds and tighten down(don't snap them),ensure the rubber O-rings/seals are still on the screws/on the bleed holes.
    5.Suck some water out so it's not full to the brim, replace the cap and then start the car. Run her up and check for heat from the vents when warm and check if over heating still persists. You may have to bleed troublesome cars twice(but rare).
    6.If all is good then check the water level again in the morning when cool.
     
     

  9. The Following User Says Thank You to Ronnie For This Useful Post:

    TimZ3 (22-12-2009)

  10.  
    #7
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    TimZ3's Car Details
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    Thanks for the help. certainly gives me a few things to have a look at over xmas. Hopefully it will be something simple

    thanks again, i appreciate it
     
     

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