Question about 2004 Volkswagen Passat
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Posted on Jan 02, 2017
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.
Posted on Feb 28, 2009
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.
Posted on Mar 30, 2009
This happened to my Passat, and little by little the air kept getting colder and colder until there was no heat left....I just took it in to get looked at- The heating core is gone- the part itself not that expensive, but since they need to take apart the entire dash to replace, the total job is like $800, $700 of that is labor!
Posted on Feb 02, 2010
SOURCE: Blower suddenly quit working
The recharge of your a/c system and this is unrelated, could be a bad blower motor or blower motor resistor, have you checked your blower motor fuse? If fuse good, check voltage at blower motor, sit under dash on passenger side, just below dash, you will be able to see it, will have two wire's going to it, only one will have voltage with switch on, if you have voltage replace it, not that hard of a job to do, shop repair time to remove and replace blower motor is .7 tenths of an hour, hope this was very helpful.
Posted on Jul 07, 2010
I live in Chicago, ilI and have the heater core same problem on passat 2003 GLX w 50K miles. Mechanic at general shop (not at VW dealer) flushed the heater core and heat is back and realy good as new. I like to do it myself but it is too cold to do outside or event in the garage.
Posted on Dec 12, 2010
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