My vw passat 98 leaks antifreeze once a while

Probably heater matrix is leaking - using the demist often makes the window misting worse, at least until the the car and engine is thoroughly hot. Often those with a keen sense of smell recognise the odour of hot antifreeze, sometimes described as spicy like pig-meal or gravy-like.

check battery and battery connection,fuel filter,air filter.

Replace the ( CTS ) Coolant temperature Sensor. VW oe only...Been updated.

Check the bottle is full. Do not use coolant sealers in this engine! Fix the leak.

if you have to add add coolent alot you have a rally bad leak

do you knotice a puddle under your car?

if soo if it looks like its comming from the ver front of the car it could be a bad hose/radeater if its close to the moter check and see if ts a hose if its not you may have a cracked block or head (to find out this for shour start the car and put your hand near the exhost pipe and see if your hand gets moist or wet if it does and the exhost smells like coolent you have a cracked head or block or a bad head gasket (it usually is a bad gasket)

i hope this helps

have you checked all the hoses for leaks as well as radiator? Yes a water pump may be the cause and can be done by a do it yourselfer depending on your skill level.

Check the engine code. If It is P0103 then your mass air flow sensor is messed up. Also the wiring on the 1.8T deteriorate easily. Finally, you might have a vacuum leak. Check the hoses in and out of the intake box.

No. I would go with the cheaper set.

Make sure it has enough antifreeze otherwise try giving a good flush

ABS and coolant are unrelated unless there is a problem with the ECM (engine control module) or instrument panel. Is the red coolant warning sign for coolant level or temperature?

With ABS if there is any failure with any brake electronic component (sensor, motor, or fluid level etc) the ABS will shut down completely and flash the light. If the light is on or flashing the ABS is non functioning.

I need better information on the coolant and ABS to give better information.