Heater problems in my vw passat

If you are talking about the belt for the ac compressor, yes the heater should still work.
If the blower is not working, you will need to have the blower motor checked for voltage and ground.

Check the coolant level, - air in cooling system.

That's frustrating. If the fan motor sounds healthy when it does run the you probably have a faulty fan switch. When it does come on if it works at all speeds then it's possible there's a bad connection at the switch but this is unlikely. Unless you have experiance with replacing dashboard switches on a VW you wiil probably have to pay a tech to replace it and at that time the swith could be tested with a volt/ ohm meter to make sure that's the problem. I wish I could help more. Good luck.

good day, you may have some heating core issues, anti freeze leakage, have it checked. hope this helps, have a nice day

did you tested climate control switch for power

There is an electrical relay that is malfuctioning. I had the same problem on my 2000 VW Passat. I just got it fixed, part cost 48 dollars and labor will be about an hour.

check fuses..came across a bora with much same problem..it turned out to be a coolent tempreture switch the heater gauge wasn't working and on diagnostics it was reading -41degrees celcius the fan was not running because it thought it was freezing outside also blew the fuse of the fan also

I have the same problem, but mine was because someone put stop leak in it! otherwise, check my profile, someone posted a answer that may help you.

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.

bad heater core?