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Thread: No Hot Air From Heater

  1. #1
    EssexAvantii's Avatar
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    No Hot Air From Heater

    Hi Guys, I need to pick your brains.
    Got into car yesterday and all is well however, i cannot get the inside of my car to warm up.The Mrs has noticed that since the weather has turned the car car takes an age to demist-- she just forgot to mention it!
    The heater is blowing full blast out of the vent near the screen, when i switch to floor i can hear flaps move, full blast down below but, as near windscreen, stone cold air.
    The expansion tank is full with water.
    There are no visible water leaks.
    The car heats up to 90 degrees but goes no further(Does not overheat) if anything it drops down from 90 to about 1/4 way then back to 90.
    The air con is not on cold!
    I have owned the car for 2 months now, previous owner said water pump changed 3 months ago but no reciept.
    My car is A4 2.0 fsi petrol
    All advice welcome as its got me stumped, as cold air normally means no water!
    Help

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  3. #2
    bez101's Avatar
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    stat

    the main flap for hot or cold may be stuck
    glovebox out and check that way
    or vcds scan should pick flap faults up if broke or jammed
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  4. #3
    bez101's Avatar
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    also get car upto 90 and check pipes going to heater matrix see if there both hot
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    S4_dan's Avatar
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    Quote Originally Posted by bez101 View Post
    stat
    +1

    Sounds like a poorly thermostat.
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

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    That's quick bez101!
    Scan not possible yet as i don't have one,don't know anyone(cos i'm sad, boo hoo) and don't want to go to dealer unless i absolutely have to
    I will try the glovebox route as this seems to be the cheap 'first look' i can definately hear flaps changing but not the hot/cold change.

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    You guys are a speedy bunch!
    S4-dan i thought thermostat too. Would i be wrong in that they either work or they don't. Car does take a long time to get to 90 but as stated then drops a bit. i thought they normally seized closed and make the car overheat but either way no hot air.
    Thanks for replying

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    Are these pipes accessible from in the car or in the engine bay?

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    S4_dan's Avatar
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    Quote Originally Posted by EssexAvantii View Post
    You guys are a speedy bunch!
    S4-dan i thought thermostat too. Would i be wrong in that they either work or they don't. Car does take a long time to get to 90 but as stated then drops a bit. i thought they normally seized closed and make the car overheat but either way no hot air?
    Stats are fail-safe. Meaning they tend fail in the open position so the water circulates the whole system not just the block, hence your system taking a long time to reach op-temp. As soon as the engine is not labouring, the water temp will quickly drop as the thermostat isn't closing properly to control/maintain the temp of the coolant.

    Dan
    EssexAvantii likes this.
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  10. #9
    S4_dan's Avatar
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    Quote Originally Posted by EssexAvantii View Post
    Are these pipes accessible from in the car or in the engine bay?
    Rear of the engine block and you should see the two hoses going into the bulkhead.

    Dan
    EssexAvantii likes this.
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  11. #10
    bez101's Avatar
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    under the bonnet 2 pipes
    you cant miss them
    if stat was gone you would still get some heat as audi normaly stick open not closed
    EssexAvantii likes this.

  12. #11
    EssexAvantii's Avatar
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    Thanks bez101 and S4-dan for your replies.
    I will go check the pipes first as that's easy, cant do the glovebox as its gonna be pitch dark in about 15 mins, so i will try that tommorow if i get home from work early enough.

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    Update
    Ok guys, i ran car up to OT 90 degrees.
    Its now pitch black outside! I think i found the two pipes going into the bulkhead between the battery and the servo (i had to remove the bulkhead covers) they are both hot.
    I put the fan on demist and put my hand over the vent in the middle near the screen. NS is stone cold OS not quite as cold(still cold)
    Does this confirm that its a broken flap or a busted matrix to you guys?
    I'm thinking that the thermostat, whilst may needing replacement, isn't stopping the water flow and in turn shouldn't stop warm air through the heater.
    Thanks for your patience
    Tony

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    S4_dan's Avatar
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    Quote Originally Posted by EssexAvantii View Post
    Update
    Ok guys, i ran car up to OT 90 degrees.
    Its now pitch black outside! I think i found the two pipes going into the bulkhead between the battery and the servo (i had to remove the bulkhead covers) they are both hot. So the matrix isn't blocked in terms of water flow

    I put the fan on demist and put my hand over the vent in the middle near the screen. NS is stone cold OS not quite as cold(still cold)
    Does this confirm that its a broken flap or a busted matrix to you guys? Do you get heat when you put the the floor vents or face vents on?
    I'm thinking that the thermostat, whilst may needing replacement, isn't stopping the water flow and in turn shouldn't stop warm air through the heater. The thermostat wouldn't stop the flow of water through the matrix. It only stops the flow through to the radiator to help heat the water quickly then opens up to the radiator to maintain a steady temperature. And no, it wouldn't prevent heat coming from the matrix. But it could be the cause of the long wait to get to temp and the fluctuation of temp
    Thanks for your patience
    Tony
    So could be jammed motor flaps, ducting may have come adrift or the matrix is full of dust/debris preventing air flowing through it releasing the heat.

    Dan
    EssexAvantii likes this.
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  15. #14
    EssexAvantii's Avatar
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    all vents have air flow Dan, its just cold no hot air at all
    Looks like glove box off then and hopefully i can physically see whats up?

  16. #15
    S4_dan's Avatar
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    Either matrix is blocked preventing the heat from being pushed out (hence just cold air felt), or fan/ducting dislodged (most unlikely) or the most likely, the valve that adjust the flap for cold air feed/hot air feed from matrix is jammed/broken.

    Glovebox out job and a good poke around.
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  17. #16
    S4_dan's Avatar
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    Quote Originally Posted by bez101 View Post
    the main flap for hot or cold may be stuck
    glovebox out and check that way
    or vcds scan should pick flap faults up if broke or jammed
    As per here...
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  18. #17
    EssexAvantii's Avatar
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    Thanks for your time Dan i will give it a go when i get home from work if any light left!

  19. #18
    EssexAvantii's Avatar
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    And yes, looks like bez101 was in right ballpark to start!
    S4_dan likes this.

  20. #19
    S4_dan's Avatar
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    No problem. If you need a new motor, then JamesQuattro is selling a motor from his A4....... See his advert in classifieds.....he is breaking (Sadly) his A4 2.5 Q.

    Hope you get to the bottom of it.

    I would still be inclined to check your thermostat though. Buy genuine not pattern as they often fail!

    Dan
    2002 2.5 V6 Quattro
    Mods Done: Q5 Rear aero wiper. Front ambient light install. Led number plate lens. Towbar with 13pin electrics.
    Mods to complete: Sport shocks to go with Eibach pro springs. Fit 17" 5 star matt black wheels. Fix lack of torque at low revs. Get a custom exhaust system fitted.

    FOR SALE - Eibach Pro Sport springs for a 2.5 V6 B6/7 PM ME.

  21. #20
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    Cheers for the heads up fella, worth bearing in mind

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    Update

    Well i had the dash out ( well glovebox and the drivers knee panel) today
    Good and bad news
    The good news is all 5 of my motors are working i tested them whilst attached and unattached and then moved the levers by hand and they all seem fine.I also discovered why my glovebox interior light wasn't working - the switch was not attached to the hinge, easy fix.
    Bad news is still no hot air at all.
    So do i change the stat,heater matrix,control unit or should i just stump up for a vcds and scan 1st.
    Please help other than the stat this is starting to look expensive

  23. #22
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    If the pipes are both hot its got to be the matrix

  24. #23
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    Mike B thanks for the reply please bear with me, i am not discounting any advice at this stage.If it is the matrix, i am assuming the two pipes - 1 inlet 1 outlet therefore if the matrix is busted how can they both be hot? if it was blocked as i have read elsewhere(sludge or the like) would the outlet not get hot? i'm just trying to work out how these things work so as to avoid buying stuff i don't need so please have patience

 

 

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