Question about 2000 Volkswagen Passat 4Motion
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?
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..
Posted on Jan 19, 2009
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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