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Thread: No heat working in car

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    Default No heat working in car

    Hi

    Wife has a 2004 BA XR6 NA and the heater is not working at all. The fan works fine, but no heat at all no matter how long it runs for. Thought it may be thermostat? Never ever had a problem with it and the heat stopped working the same day I pressure washed the engine bay. Maybe I knocked off a cable or something?

    Anyone have any idea?



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    Haven't looked into this in a modern car but in the old days the heater works by switching on a valve to let radiator "coolent" flow into the heater assembly. There often is mechanical linkage from the heater control lever, but I suppose it could be electrical, that turns off/on this valve. You should be able to see radiator hoses (probably 3/4" or 5/8" in diamter) going through the firewall in the engine bay and you may be able to spot the valve.

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    does the BA have climate control?
    is the air-con working?

    Dash

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    Fords usually use pneumatic hoses to switch valves for hot water, heater vents and other stuff. They are driven off manifold vacuum or air pressure of some sort. (sorry, never got into fords that much, they drive like a barge and the power steering is always too light.) Japanese cars tend to use cables and levers to do the same job.

    The problem is quite likely to be a small air hose that has split, or come off somewhere.

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    Quote Originally Posted by navy blue View Post
    Hi

    Wife has a 2004 BA XR6 NA and the heater is not working at all. The fan works fine, but no heat at all no matter how long it runs for. Thought it may be thermostat? Never ever had a problem with it and the heat stopped working the same day I pressure washed the engine bay. Maybe I knocked off a cable or something?

    Anyone have any idea?
    check heater valve lower left hand side of motor near firewall usualy either rusted away or vacuem hose is off

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    Yes the ford heater is vacuum operated. The point of the vacuum source is the intake manifold.

    Most likely the hose may have slipped off its fitting on the intake manifold on the engine (close to the fire wall, passenger side).

    There are a few vacuum hoses in this area, if you dont find anything obviously dissconnected you could run the engine and carefully listen for hissing sounds.

    These vacuum valves are also known to break their diaphrams inside the car behind the heater switches, but it generally on older Fords.

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    just a thoguht could it be the heater core itself?

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    Nah, there'd be water all over the floor.

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    It will be the HIM module or the Blend Door Mixer shaft, really hard to get to and even see.

    Sometimes the shaft comes out of the HIM and if you have the ICC box (radio and heater) out you can see in between the glovebox and heater box.
    On mine I just had to get a really long screwdriver (about 2.5 foot long) and poke it down there (carefully) and twist with a little pressure and it clicked in and is working again.

    Be carefull if your gunna pull it apart though as everything is brittle and lots of electrical stuff to disconnect.


    Circuit

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    Quote Originally Posted by biggeorge View Post
    Nah, there'd be water all over the floor.

    ....but not if the core of the heat exchanger was blocked !

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    Quote Originally Posted by bulbous View Post
    ....but not if the core of the heat exchanger was blocked !

    Yes but i doubt a 2004 BA would have allready have blocked its heater core.

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    [QUOTE=navy blue;49348]Hi

    Wife has a 2004 BA XR6 NA and the heater is not working at all. The fan works fine, but no heat at all no matter how long it runs for. Thought it may be thermostat? Never ever had a problem with it and the heat stopped
    !!!!!I pressure washed the engine bay.!!!!!!
    QUOTE]

    there is the answer
    he pressure washed the engine bay...
    logic says he has pushed the vacuam hose off the heater valve left hand side of motor near firewall

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    Been away for a week, thanks guys will read thoroughly thru post and check tomorrow. Vacuum hose seems likely to me as above mentioned. If coolant was low, would this affect it?

    Cheers
    NB

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    Quote Originally Posted by navy blue View Post
    Been away for a week, thanks guys will read thoroughly thru post and check tomorrow. Vacuum hose seems likely to me as above mentioned. If coolant was low, would this affect it?

    Cheers
    NB
    A low level coolant in your overflow bottle would not effect it.

    No coolant at all would effect though. It would also blow your engine.

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    Quote Originally Posted by global88 View Post
    A low level coolant in your overflow bottle would not effect it.

    No coolant at all would effect though. It would also blow your engine.
    I'm no mechanic, thus the reason for asking this qstn. Does the overflow bottle have to have only coolant in it, ie no water, or can water be in the overflow bottle. Does the water just directly go into the radiator ?
    So no coolant would stop the heat from coming on? I think it may be just a little low though....


    Cheers
    NB

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    Senior Member global88's Avatar
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    Ok the radiator overflow / top up bottle is the input point of the water.

    It connects directly to the radiator, you maintain your water level in the overflow bottle.

    It should sit higher than the radiator in fords and feed down into it. When the radiator needs water it takes it from the overflow bottle. Too much water will expand and overflow out.

    Its best to keep the water between low and high level markings as these are the optimal levels for the system to run correctly.

    Coolant is water with an addative that protects the system from freezing in extreme cold and /or raising the boiling point of the water to make it more heat tolerent and /or a corrosion inhibiter to stop corrosion inside the coolant passages, water pump etc.

    You can pour water safely inside.
    You can go later when your in the mood and buy some addative to improve the water quality from supercheap autos or ford if your fussy.

    You may have noted that the radiator water is coloured, this is the addative that makes it coolant. If your water is clear you have no coolant.

    Nothing wrong with it untill 5 years or so have passed and the system starts corroding inside.

    Have you had a look at the owners handbook? Filling the unit should be explained.

    One question though, does you engine temperature gauge show heat in the correct range when its warmed up?

    If it does then your engine thermostate is fine.

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    In response to all questions:
    Engine temp guage shows normal about a quarter when idling for 5 - 10 minutes, so it isnt thermostat?
    Air conditioner is working
    No climate control

    Checked all hoses cannot find any off or any hissing noises. Im confused. Wondering if Im missing a hose of the top of the manifold???? There is 1 hose on the manifold towards the firewall and looks like there may need to be another one???? Does that make any sense?? Will try and get pics soon.....

    Cheers
    NB

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    Quote Originally Posted by navy blue View Post
    In response to all questions:
    Engine temp guage shows normal about a quarter when idling for 5 - 10 minutes, so it isnt thermostat?
    Air conditioner is working
    No climate control

    Checked all hoses cannot find any off or any hissing noises. Im confused. Wondering if Im missing a hose of the top of the manifold???? There is 1 hose on the manifold towards the firewall and looks like there may need to be another one???? Does that make any sense?? Will try and get pics soon.....

    Cheers
    NB
    should be three on manifold lefthand rear ,1 for m.a.p .1 for heater control and 1 polution control

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    If engine temp stays 1/4 to 1/2 the thermostate is good.

    The hose's that the heater water run though are a pair, about say one inch in diameter.

    They should run from the engine into the firewall beside each other.

    I think the Ba ford's have the hot water tap in the engine bay near the firewall. If you follow one of the 2 hoses a short distance back from the fire wall you should find it and a vacuum assembly to operate the lever on it. Check that the hose is on the diaphram assembly.

    Also operate your heater, turning it on and off, to see if the arm to operate the heater valve is moving or not in the engine bay.

    Yes please post some pics of your engine bay, it would be good.

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    Thanks global

    Here are some pics.... hope they can help. Can u point out on the pics wot i should be looking at....



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