Question about 1A Auto Parts 1990-1994 VW Passat Heater Blower Motor Resistor

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I have 2003 vw passat, which has very little heat, I replaced the thermostat and flushed the heater core, still no heat!! Now when I loosing the heater core pipe there doesn't seem to be any water coming, could the system be air locked?? Please someone help as I am v cold

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If you still have the car, I know its been a while since your post, but try changing the radiator cap with an OEM replacement. They can cause the radiator NOT to pressurize and not to heat up.

Posted on Feb 23, 2016

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Air lock is possible! When you flushed the cooling system you should do this with the thermostat removed, then to bleed the system put heating control to hot, leave the expansion cap off, start the engine and let it get to the fans cutting in! You should see bubbles coming from the expansion bottle! Replace expansion bottle cap and turn engine off! Enjoy the heat!

Posted on Nov 09, 2014

Testimonial: "Thanks for ur quick reply, do u think I'd need to take the thermostat out again, to do it right?"

  • 11 more comments 
  •  Mikey
    Mikey Nov 09, 2014

    The thermostat would stop any rust or debris from being flushed out! But at this stage just to expel any airlock I would leave that for the moment! For future reference to flush properly remove it!

  • Patrick mc Gurk
    Patrick mc Gurk Nov 09, 2014

    Ok going to try and remove any airlock, thanks again for ur info,

  •  Mikey
    Mikey Nov 09, 2014

    Good luck! Post back with results!

  • Patrick mc Gurk
    Patrick mc Gurk Nov 09, 2014

    Will do

  • Patrick mc Gurk
    Patrick mc Gurk Nov 09, 2014

    I tried what u said, and there's not much joy, there was a small flow going to the heater core, but went away again,

  •  Mikey
    Mikey Nov 09, 2014

    When you say heater core! Is that the heater matrix behind the dash? You are not getting a water flow to that? If so then it must be a blockage in the pipes? When you flushed the system did you see any debris coming out?

  • Patrick mc Gurk
    Patrick mc Gurk Nov 09, 2014

    Yes that's it behind the dash, yes there would have been some dirt and rust, it seems that it's not getting pumped up the length of the dash,

  •  Mikey
    Mikey Nov 09, 2014

    Then it could be the water pump! That circulates the water around the system!

  • Patrick mc Gurk
    Patrick mc Gurk Nov 09, 2014

    I was hopping u wouldn't say that:( is that a big job and costly?

  •  Mikey
    Mikey Nov 09, 2014

    Yes! Time consuming and ultimately costly! Normally this is done when the timing belt is replaced! Is the timing belt due for replacement?

  •  Mikey
    Mikey Nov 09, 2014

    To check remove a hose close to the pump and turn over! If good pressure then can rule out pump and look into blockage in system! Them

  •  Mikey
    Mikey Nov 09, 2014

    then re-flush system! Flushing must be done with heater setting on hot and using a hose pipe flush in one direction and then back flushing with the thermostat removed as pointed out earlier!

  • Patrick mc Gurk
    Patrick mc Gurk Nov 09, 2014

    The man I bought the car off said he changed t belt 10.000 miles ago, so I am not sure if he did the water pump tho, I will check pressure at water pump, thanks for ur help so far,


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Shop claims my heater core is plugged and needs to be replaced. 2003 VW Passat GLX 4Motion, V6. Any other options

Probably not. It really depends on the situation and what is going on. If you are not getting any heat it could be the heater core or it could be as simple as a thermostat.

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2004 vw passet no heat replaced watr pump ,themostat,cool sensor,flushed,car runs fine no heat

i think u have air traped in heater core ,seat in car and push gas pedal up too 3000 RPM and hold it for1-2 minutes turn heat on and should come on good luck

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i don't know realy if there is a fuse (though i doubt it) but issues with heatting may be this will help.

If the carpet under the heater core is damp, or if antifreeze vapor or steam is coming through the vents, the heater core is leaking.
Remove it and install a new unit (most radiator shops will not repair a leaking heater core.
If the air coming out of the heater vents isn't hot, the problem could stem from any of the following causes:
  • The thermostat is stuck open, previnting the engine coolant from warming enough to carry heat to the heater core. Replace the thermostat.
  • There is a blockage in the system, Preventing the flow of coolant through heater core. Feel both heater hoses the firewall. They should be hot.if one of them is cold, there is an obstruction in one of the hoses or in the heater core,or the heater control valve is shut. Detach the hoses and back flush the heater core with a water hose. If the heater core is clear but circulation is impeded, remove the two hoses and flush them out with a water hose.
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Oct 29, 2009 | 2002 Volkswagen Passat

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My 03 G35 is overheating and no heat in the cabin

The thermostat was a good choice however you should go to a service station and get a complete cooling system flush.
your heater core and or radiator could be clogged.

Oct 09, 2009 | 2005 Infiniti G35

2 Answers

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!

Jan 31, 2009 | 2001 Volkswagen Passat

2 Answers

2000 Vw passat,had no heat.

The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case.

To attempt to clean the core, you must flush the system multiple times. If it is still problematic, changing it is your only remaining option besides the water pump itself.

Jan 15, 2009 | 2000 Volkswagen Passat 4Motion

7 Answers

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.
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.

Nov 25, 2008 | 2001 Volkswagen Passat

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