Question about 2004 Volkswagen Passat

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2004 volkswagen passat v6 no heat

Last year heat would barely get warm this year no heat at all just fill like a/c is blowing all the time heater core shows no signs of leaking on floor or steaming or antifreeze smell

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  • Glendisteu Nov 13, 2008

    I have a very similar problem.. I already spent over $400 trying to fix it and barely any change. The mecanic changed the thermostat, and did a flush. He is now saying that is maybe the water pump!! (Wich BTW I changed less than a year ago). Right now it blows some warm air while I drive my car very fast, but is not so warm if my car is stop at a traffic light.

  • Anonymous Nov 26, 2008

    exactly the same problem...

  • Anonymous Mar 21, 2014

    Do i need a gas tank if gas leaks when I fill up my car?

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Do you notice that the engine coolant temperature gauge stays on the lower part of the scale as well? If so, it's likely that your thermostat is stuck open - this prevents the coolant from staying in the block long enough to absorb heat that is used to heat the climate-controlled air. I'm not positive on the 3.0 in your car, but the 2.8 V6 in my Audi A4 requires tremendous disassembly in order to change the thermostat. I believe the 3.0 is the same - the labor involved is only slightly less than that required to do a timing belt change (which, if you change the thermostat, since you're already all the way in there, you may as well do the t-belt service as well so you don't have to pay for all that labor again any sooner than necessary).

Posted on Sep 30, 2008

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The heat in my Volkswagen passat 2002 only gets warm while driving. when sitting it blows out cold air. what is wrong with my heat


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2004 passat heater isn't blowing hot air. both hoses are hot going into the heater core. anyone had this same problem and how can i fix it?


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My 2005 Passat has little to no heat. It worked last year but this year no go. It has 95000 miles on the vehicle.


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1 Answer

My heat not workini but blow cold air where is


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Heater Only Producing Warm Air


I had the same problem and remedied it by disconnecting the heater core at the firewall (you have to remove the plastic shield by the windshield to access) and filling the core with radiator flush. I let it sit for 4-5 hours and then flushed the core with water from my garden hose. To make the connection, I cut a rubber washing machine supply hose, which fit inside the tubes to the heater core.

Once flushed, I added "Water Wetter" to remove any air bubbles from the system. heat now works great.

BTW - both the dealer and and independent said I needed to replace the heater core, at a cost of $1500. Glad I tried this first! Good luck!

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Low heat from my 2001 Passat heater


There are known problems with this vehicle's heater core not getting enough coolant flowing through it to blow hot air.
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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.

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Had this problem after replacing water pump. Hard system to bleed. small bleeders on heater hoses and one near the front of the engine.
VW vortex has a post on cooling system bleeding. check to see if both heater hoses are hot. if so check the climate control: push econ and mode at the same time. it will give you codes. The blend door can be checked for freedom of movement.

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