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.
Testimonial: "How do I go about checking the voltage and ground on blower motor? Can I do that myself? "
SOURCE: 2004 VW passat not heating
COLD AIR WHEN IDLING COULD BE...
1) Low on coolant - the most common reason for this heater problem. Make sure your coolant level is full.
If the level is low, it could be because the radiator cap is not sealing well or it could also be a cracked overflow container (hot coolant that bleeds out of the engine and drops to the street so you never see the puddle on your driveway).
2) An air-lock in the coolant system - it needs to be burped. Park your car facing-up the steepest hill you can find. Remove the radiator cap a (be careful - best to do when engine is cold) and rev engine to 2000 RPM for 60 seconds - hopefully the air will burp out the cap. Top it off with 50/50 antifreeze.
3) A disconnected or cracked vacuum line. I've heard about this one but never investigated.
SOURCE: heater problems in my vw passat
Try removing he heater hoses going into the firewall(when cooled)and blow the heater core out with compressed air.Or you could have the cooling system flushed.
SOURCE: 1999 VW Passat. Head lights Blower motor blinkers
yes, it's called the load reduction relay and it is in the 13 fold relay panel under driver side dash.
SOURCE: 1999 VW Passat low idle
replace your fuel filter first. If that does not do it, then try an air-flow meter. (if the check engine light is on it may be an airflow meter.
SOURCE: car door will not open. vw 1.8 1999 passat
remove door panel and check actuator for power and that actuator rod is connected and the plastic clip did not break or pop off
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