Replacement fuse ok for a few miles ,then blows!
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: 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: The heater on my 2002 VW Passat is blowing cold.
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.
SOURCE: 2006 Passat Air Conditioning Problem
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.
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Usually answered in minutes!
start with a volt meter unplug the pigtail wiring to the blower motor and add two paper clips or you can just back probe the wires its above the passenger side kick panel with your volt meter check to see how many amps its pulling if its more then the fuse rating that is called for then you need to replace the blower motor
amperes must be measured with the test equipment in series with the circuit or with an inductive amp probe
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