heater not giving any heat!
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  1. #1
    Tadpole
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    Icon5 heater not giving any heat!

    hello
    got 98 xantia TD with AC the blower works but the heat only gets luke warm?
    any ideas?
    from england so i am currently freezing my b*****ks off!
    cheers

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  2. #2
    Fellow Frogger! Clogzz's Avatar
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    Check that both heater hoses are getting about equally warm.
    That would mean that there's enough warm water going through the heater.
    The hoses are over an inch thick, and are high up, going through the bulkhead into the cabin.
    If they are cool, there's air in the system, and would need venting out.
    If warm, then the fault is in the airflow controls and flaps.
    2003 C5 2.0i AL4 205,000 km 76372389

  3. #3
    Tadpole
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    cheers will have a look

  4. #4
    Fellow Frogger! Jack Z's Avatar
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    Could also be the heater tap (switch) and / or the heater matrix again checking BOTH hoses for equal temp will identify if the system has a clear flow.

    Obviously repairs would be very different for each case.

    If there was air in the system then the car would also be over heating however the freezing cold temp may be preventing this...

    I would go through all the basic checks:-

    1) Is the car temp getting to normal or is it staying cold??? This would be the first thing I looked at... (Thermostat!) You can't get heat from an engine that is not running at the right temp!

    2) Check thermostat replace if required. (Critical in cold climates)

    3) Check coolant level and ensure there is anti freeze and bleed air from system making sure the heater is on full while your bleeding.

    4) Check temp through both heater hoses... if not the same then it has to be switch / matrix.

    BX TZI Hatch
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  5. #5
    Tadpole
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    temp gets to 65-70
    is that normal or cold?
    the car only cost me £250 so if its going to be expensive to repair i#ll just buy a wooly hat and gloves

  6. #6
    Fellow Frogger!
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    Quote Originally Posted by ssbnreso
    temp gets to 65-70
    is that normal or cold?
    the car only cost me £250 so if its going to be expensive to repair i#ll just buy a wooly hat and gloves
    Seems a bit low to me.

    80 degrees is normal for a petrol, I wouldn't think it would be much different for a diesel. Certainly not less than 70.

    The first thing to check as others have mentioned would be the water thermostat, its probably seized open....(or missing altogether - a common "quick fix" for a thermostat jammed closed)

    Easy to get out, and easy to test. (You can put it in a bowl of boiling water to see if it opens...)

    Regards,
    Simon
    1998 Xantia Mk2 V6 Auto Exclusive

  7. #7
    Fellow Frogger!
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    Quote Originally Posted by Jack Z
    Could also be the heater tap (switch) and / or the heater matrix again checking BOTH hoses for equal temp will identify if the system has a clear flow.
    As far as I know, the Xantia's don't have a water tap for the heater - the matrix always runs hot, but flaps direct the air flow through the matrix or not depending on the required temperature...

    Regards,
    Simon
    1998 Xantia Mk2 V6 Auto Exclusive

  8. #8
    Fellow Frogger! Clogzz's Avatar
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    Default Thermostat testing

    A reliable way to test the thermostat is to start the engine from totally cold, and feel the top radiator hose for how long it takes to warm up.
    If it slowly-slowly warms up from the beginning, then the thermostat is stuck open and the engine will never reach normal temperature by cold weather.
    If the hose stays cold for long, possibly over 5 minutes by cold weather, and then all the hot water arrives suddenly, then the thermostat is good.
    2003 C5 2.0i AL4 205,000 km 76372389

  9. #9
    Tadpole
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    going outside now to try all of the above

  10. #10
    Tadpole frithnow's Avatar
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    Default problem solved

    It's winter in England now right? Well your heater probably wont work properly til summer. Your air conditioning should be working fine though...
    (39˚C here in Perth today and my heater seems fine!)

  11. #11
    Tadpole
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    engine running at 70 degress
    both heater hoses hot
    so i assume int something to do with the control flaps then

  12. #12
    Tadpole
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    The Xantia should have a thermostat that opens at 80 degrees, I replaced my thermostat a couple of weeks ago but still only struggle to reach 75 degrees, its just cold and the engines are so thermally efficient that the heater can provide sufficient cooling to keep the stat closed, does it get warm when given a decent run of say ten miles?
    Stewart

  13. #13
    CitroŽn, what else? smiffy1071's Avatar
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    That still sounds way too cool to me!!
    The thermostat is the first thing to replace, they cost about £8 from halfords.
    My ZX has very poor heating at the moment, so I know how you feel!
    john s
    2005 C5 2.0 VTR Hdi 138, 1986 Kawasaki GPz 750G2

  14. #14
    Tadpole
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    Quote Originally Posted by frithnow
    It's winter in England now right? Well your heater probably wont work properly til summer. Your air conditioning should be working fine though...
    (39˚C here in Perth today and my heater seems fine!)
    in the north of england i'll still need the heater on in the summer

    i'll be lucky to see 39F

  15. #15
    Tadpole
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    Quote Originally Posted by smiffy1071
    That still sounds way too cool to me!!
    The thermostat is the first thing to replace, they cost about £8 from halfords.
    My ZX has very poor heating at the moment, so I know how you feel!
    john s
    as it's proberly the cheapest option i'll give it a go

  16. #16
    Fellow Frogger! Clogzz's Avatar
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    Since both heater hoses are getting hot, I'd say that there's plenty of hot water going through them.
    As the car is air conditioned, it has a pollen filter above the passenger floor space.
    If it's black, it can restrict the flow of warm air from the heater.
    The filter can be washed, dried and even scented for re-use.
    You can find out what the thermostat is doing by feeling the top radiator hose as per my story above.
    2003 C5 2.0i AL4 205,000 km 76372389

  17. #17
    Good Sport danielsydney's Avatar
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    from england so i am currently freezing my b*****ks off!
    I was going to say leave it disconnected.

  18. #18
    CitroŽn, what else? smiffy1071's Avatar
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    Quote Originally Posted by danielsydney
    I was going to say leave it disconnected.
    Have you ever ridden in a car, in frosty weather, with no heating? Let me tell you it is BLOODY UNPLEASENT!!!
    john s
    2005 C5 2.0 VTR Hdi 138, 1986 Kawasaki GPz 750G2

  19. #19
    Tadpole
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    Quote Originally Posted by smiffy1071
    Have you ever ridden in a car, in frosty weather, with no heating? Let me tell you it is BLOODY UNPLEASENT!!!
    john s



    coming from a true brit!

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