Ineed instructions to replace the heater core on a 96 vw passat

More than likely heater core leak, I assume you are losing coolant. I've changed a couple heater core in my life but nothing like changing the one in the video. I saw 3 videos, and all said you have to pull the dash.

How VW Parts Fail ~ Heater Cores - YouTube

VW Heater Core Replacement - 1993-1998 VW Jetta and Golf - YouTube

I do not know exactly how the on and off switch turn work but check the cable connection from, to it main switch last. clog heater core. bad thermostat. tuff job. check hoses and make sure no air or space inside the hoses instead of coolant..

check it the heater control is allowing hot water through the heater core.(turning the tap on )

Sounds like the heater core and it will cost anywhere from 200.00 to 400.00 unless you can replace it your self.

Probably not. It really depends on the situation and what is going on. If you are not getting any heat it could be the heater core or it could be as simple as a thermostat.

remove dashboard.  and knee panel.  center console.  remove bolt holding tip stereing wheel. disconnect all wiring. leave heater controls connected to heater housing, but remove from dash. seperate heater housing from blower housing by removing 6 clips.  remove two nuts from under hood on firewall and disconnect heater hoses.  pull heater housing from firewall and seperate from blower housing.  remove heater core from heater housing.  took me an hour and a half to remove.  two clips are between firewall and heater housing, and was able to pop them off when i tugged on heater housing.

well you'll need to spend about $20 to buy the book from autozone or just go to their website the have comprehensive repair info can be a real life saver use the print option if you want and you can take a copy to your car

Heater Core is blown so now it's not producing Hot air just cold! Same thing happened in my 96 Jeep. You have to replace the heater core.

There are known problems with this vehicle's heater core not getting enough coolant flowing through it to blow hot air.
1) Even if the coolant looks good, there are problems with the heater core plugging up. One solution is to use a heavy duty cleaner (CLR pipe cleaner) to back flush the heater core. To know if the heater core is plugged up, disconnect the 2 heater hoses at the heater core and somehow connect a hose to one end of the core. Try to flow water through, it doesn't have to be high pressure, and there should be a steady stream. If not, try to get the cleaner directly into the heater core and let it soak. Then back flush it and a lot of scale should be seen coming out.

2) The other problem is that since the heater core is the highest point in the cooling system air tends to get trapped in it. This should only happen if the coolant goes low or someone has opened the system to service it. There are a number of ways to bleed the system (vacuum bleed, pressure bleed). One of the hoses should have a small hole in it for bleeding air, pull that hose back just enough so the hole allows coolant to flow out of it. Then accelerate the engine and get a good flow coming out, when no more air bubbles are present, there should be good heat.

3)I've heard of bad water pumps with low flow causing issues as well as an aux. water pump not fuctioning correctly leading to poor heat output from the heater core. Someone should confirm this as I cannot get much information on the aux water pump(electronic pump by the alternator that is supposed to run after the car is shut off).

Hope this helps.

Ok, have your coolind system backflushed. Your heater core could be clogged. This could have been caused in using the wrong antifreeze system or mixing the green with the vw g-12 antifreeze. This could ran you about $110 to 150 dollars at a radiator shop...stay away from the Jidffy lube or oil doctor's . This could be your cheaper alternative to solution to your problem..good luck..