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CarDoc, Independent European Shop owner
Category: Car
Satisfied Customers: 6456
Experience:  20 years of experience working with European cars. Independent European shop owner and technician.
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Nothing but cold air coming out of heater vents most..Im guessing

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nothing but cold air coming out of heater vents most of the time..engine temp moves up and down by about 10 degrees...?I'm guessing...plenty of heat if its warm outside, cool to cold if its cold outside and you need it like defrosting the windshield..

Can I get year/make/model/engine please?

Customer: replied 5 years ago.

VW Passat 2001 1.8 Turbo Gas
Unfortunately, this is a VERY common problem on 98-05 Passats. The problem is sediment and scale buildup within the heater core itself. Since the blown air isn't completely cold, you might be able to salvage the heater core by some dedicated flushing techniques. You will need to remove the black plastic cowl cover, under the hood. This is the piece that runs from one side of the car to the other. You will then see the two heater hoses attached to the heater core. Remove them from the core. Then run a high pressure garden hose spray through one side of the heater core for a few minutes and then the other. Alternate back and forth a few times. Reconnect hoses and enjoy your heat. If it's still not warm enough, repeat. If after 2-3 flush attempts, you still have no heat, it's time to replace the core.
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