The head lights are not strong enough. - 2000 Ford Taurus

Any other indications? Here's not enough information unfortunately.

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you need use lots of pentrating oil let it soak in good you need a 6 point universal socket with extension you need high impact air ratchet that give enough torque to remove bolts in hard tight spots.for round off bolt head go to sears or go on line you can buy sockets remove round off boat heads.any time remove bigger bolts size 14M ON UP USE 6 POINT SOCKET GET STRONGER GRIP.12 POINT SOCKETS NOT STRONG BECAUSE SMALL GRIP TEETH WILL BREAK OFF UNDER MORE TORQUE AND STRESS..

I would agree with the mechanic. Since the engine will start but dies, you can assume that the battery may be (barely) strong enough to start the vehicle but not strong enough to keep it running. After the engine starts, the alternator does the lions share of producing enough electrical energy to produce a strong spark at the spark plugs. If the alternator is not doing its job, the battery drain fairly rapidly and your engine will die. Within a fair degree of certainty, I would say that the "trac off" light will not occur after the alternator is replaced.
Best of luck!

without a good look i dont think i could help as yes iam a europeon mechanic but a VW is a common enough vehicle here but iam thinking cam belt here but ?? yes it could be head gasket as the oil light switch is on the head top back left side and if the gasket has failed then it could be pumping oil into piston and not going up to the head to put the oil light out ,I would strongly advise you ask a local mechanic to put his head under the bonnet and give a second opinion from on the job .

hi their should be 10 bolts holding the head on and the tool you need is an inverted torque socket these are needed to undo the head bolts using an allen key would just thread the head and would mean drilling the head bolts out which is a night mare, so dont use allen keys as they will not be strong enough to undo the head bolts without threading the head bolts.
as for the gearbox as long as you have undone the 2 at the top and the ones either side and the bottom bolt you should then be able to remove the gear box from the engine, the problem with your car is the gear box has not got much room to come away from the engine far enough to allow you to get it out, you may need to undo the engine mountin bolts to allow you to have a bit extra room you may also need an engine hoist to support the engine whilst removing the box, you may get away without one but it will be difficult.

make sure you have removed the drive shafts from the gear box and also the starter motor and make sure the speedo drive is undone and also the electrics for the reverse light if this is located at the top of the gear box.

on mine the lights flicker because the battery is not strong enough..

I am suprised that a mechanic told you it might be the battery. Remember this in the future: If the battery is strong enough to turn an engine over, it is strong enough to do every other possible thing you could throw at it in a car. It takes several amps to turn that starter. It only takes a couple at the most to run that other stuff you mentioned. ' Chances are, you have an issue at the fuse box. All of these separate problems have the commonality of going through this box. Have this check out for any abnormalities (looseness, hot connections, etc.)

your battery and/or charging system isnt strong enough to handle the load the 15" subwoofer is causing.

you will need to add a capacitor to your audio system.

for the defroster only problem, check your vacuum lines. There are even lines under the dash. The switch the controls all that is run on a vacuum. It sounds like you have a head gasket leak. If the leak is big enough, you will lose vacuum pressure. The blower defaults to defrost vents when the vacuum is not strong enough. I had a leak in a vacuum line, causing the blower to switch to defrost, no matter what it was set to.