Question about 2000 Volkswagen Passat 4Motion

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2000 Vw passat,had no heat.

Changed thermostat and still has no heat and runs hot,quickly.Could too much antifreeze cause this?Also were told a clogged heater core might cause it,how do you unclog it?

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  • migamw Jan 15, 2009

    Is there a way to know for sure what the problem is without changing EVERYTHING?My heat would burn you out before it one day just stopped working,but my car never ran hot until we changed the thermostat

  • francastaned Jan 19, 2009

    my volkswagen passat not heat.........

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I went to my local dealer and he "sold me" a back flush @ nearly $300 that gave me heat for a day. They then wanted to replace the heater core @ $900. I purchased a core on E-Bay for $75, a good air rotary grinder/saw, and proceeded to cut from the eng side access to the heater core. Removal of battery and other items, some cutting and (2 1/2 hours latter) I have great heat. This is abbreviated, but plenty of space between the firewall and heat box, and cuting the box with it's attachment method allowed ease and no electrical problems from removing the dash.

Wish you luck and get with a "old mechanic" that remembers how to replace heater cores in Ford pickups..

KLK

Posted on Jan 19, 2009

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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.

Posted on Jan 15, 2009

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Heed of antifreeze coolant temperature!!!
First time you might check the thermostat operating.
The thermostat location for VW Passat 4Motion 1.9 TDI - AJM engine, is on back of the alternator at the bottom side of the bracket.
IMPORTANT: It is NOT necessary to replace the alternator if you want to change the thermostat !!!
Thermostat checking:
1. Cold engine. Start up the engine and watch of the water temp indicator. After first value 60 Celsius Degree you still warm up the engine until the lifter (pointer) reach 80 C deg. (second mark after 60 C deg.). At this time you let engine running at idle speed and check with your hand the thermostat plastic housing and hose temperature in bottom left side of the engine. Heed of alternator driving belt and ventilator fan !!!
2. If the thermostat is good the hose must be cold until the water temp indicator reach almost 90 C deg.
3. The thermostat opening temperature is 87 C deg.
4. If the hose is already warm the thermostat is out of order.

Thermostat location, Part number: 044121113, in german - "Kuehlregle" (Price around $25):

tdisline_142.jpg
Important note: Always replace the thermostat seal, position 7 in the above picture.

Please do rate my response. Thanks!

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