Is this a task for a certified Tech, or is this some thing a DIY can do?

I had a VW Shop Quote me to do it and they wanted near a $1K to do it.

I checked online and the heater Core is about $50-$100 for the part.

 

is tht passat the GLX?? i can check on alldata and give u the instructions. if you would like...

 

No this a GLS 4 door, 1.8 l turbo 02'

 

They charge alot because many things need to be removed... Hope you have the right tools...
Heater and A/C Unit - Removing and Installing CAUTION!
Before beginning repairs on the electrical system:

• Obtain the anti-theft radio security code
• Switch off all electrical consumers
• Switch ignition off and remove ignition key
• Disconnect negative (-) battery terminal
• When disconnecting and reconnecting battery terminals, observe all applicable Notes and torque specifications, as well as instructions on performing OBD program and electrical system function checks.

Notes

• Observe all A/C refrigerant system safety measures.
• Service refrigerant system using Kent More ACR 4 or equivalent.
• During servicing, all couplings, fittings and related fasteners must be torqued to specifications.

Removing

• Discharge refrigerant system. See: Service and Repair
• Drain engine coolant.
• Remove instrument panel. See: Instrument Panel, Gauges and Warning Indicators\Service and Repair

• Remove coolant hoses at heater core.
• Note Installation orientation of coolant hoses -A- (inlet and outlet) in engine compartment.
• Clamp off both coolant hoses to heater core using 3094 hose clamps (or equivalent).
• Release both coolant hose clamps using suitable pliers and pull hoses off from heater core inlet and outlet.
• Seal off inlet and outlet at heater core to prevent coolant from escaping.

• Remove refrigerant lines at evaporator.
• Remove screw -3- (15 Nm) .
• Gently rock flange with refrigerant lines -2- up and down until they release from evaporator.

CAUTION! Immediately plug open connections on A/C components and lines to prevent dirt and moisture contamination

• Always replace both O-rings -1-.

• Remove Heating and NC unit mounting screws -2- (12 Nm) and -3-(3.5 Nm) .

• Remove footwell vent assembly -6-.

• Remove support -5-.
• Disconnect all electrical connections and wiring harness tie straps at heating and NC unit.

• Carefully pull out and remove complete housing -1- from vehicle.

• Loosen instrument panel cross member -4- if necessary.

Installing
Install in reverse order of removal, noting the following:

• Inspect all heating and A/C unit housing seals for damage and replace if necessary before installation.
• Ensure all electrical harness tie straps are replaced and installed in their original locations.
• Replace both evaporator inlet/outlet 0-rings.
• Ensure refrigerant pipes are reinstalled stress free.
• Ensure evaporator water drain and drain valve are installed and function properly.

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You can check on germanautoparts.com. They have good prices on parts, specially VW...