2003 Passat GLS Wagon emits loud hissing sound

jcriepe
0

Asked by jcriepe Jul 23, 2010 at 10:25 PM about the 2003 Volkswagen Passat GLS Wagon

Question type: Maintenance & Repair

The sound sounds like high pressured air being released like the air brakes on a tractor trailer, but it goes on for 4 or 5 seconds. It only happens when I start to drive after the car has been fully cooled down. The loud hissing stars after I have driven about 25 yards. What's going on?

1 Answer

Blake Bergeron
25

This is most likely the SAP or (Secondary Air Pump). All VW/Audi cars have the same pump which was installed for emissions starting somewhere in the 90's. On the "newer" ones, the rivets break loose and the pump begins to leak and become VERY loud in some cases. The pump will only turn on immediately when you start the vehicle after it has been parked overnight and it will come on from time to time until the car is fully warmed up. NOrmally it is quiet and you can barely hear or feel it running. All it does is send unburt gas vapors through the intake pipe to make sure they get burned up. THe cost for replacement is high at a mechanic. If you have a few hours and can do the work yourself, check out this VW FORUM SITE for the Do It Yourself. VWVORTEX.COM/Forums. I have fixed one of these pumps and it was very easy to drill out the rivets and reseal the sucker with bolts and locktight. Just getting to the pump and replacing it was the long part. Good luck.

2 out of 2 people think this is helpful.

Your Answer

Add photo

Related Questions

Search Volkswagen Passat Questions

Volkswagen Passat Experts

#1 Tom Demyan
Tom Demyan
Reputation 550
#2 littlehorn
littlehorn
Reputation 430
#3 Scott Sr.
Scott Sr.
Reputation 330
View All

Related Models For Sale

Used Volkswagen Jetta"
1,075 Great Deals out of 39,301 listings starting at $995
Used Honda Accord"
1,270 Great Deals out of 70,169 listings starting at $1,288
Used Toyota Camry"
1,458 Great Deals out of 74,456 listings starting at $1,450
Used BMW 3 Series"
1,387 Great Deals out of 38,934 listings starting at $1,995
Used Audi A4"
350 Great Deals out of 11,410 listings starting at $1,988
Used Nissan Altima"
1,575 Great Deals out of 87,889 listings starting at $1,000
Used Volkswagen Touareg"
111 Great Deals out of 2,637 listings starting at $4,200
Used Mazda MAZDA6"
278 Great Deals out of 15,084 listings starting at $2,171
Used Volkswagen Golf"
76 Great Deals out of 5,843 listings starting at $2,295
Used Honda Civic"
977 Great Deals out of 60,993 listings starting at $998
Used Audi A6"
128 Great Deals out of 8,972 listings starting at $2,450
Used Volkswagen GTI"
114 Great Deals out of 4,980 listings starting at $2,500

Used Cars For Sale

2015 Volkswagen Passat For Sale
14,964 listings starting at $21,900
2014 Volkswagen Passat For Sale
68 Great Deals out of 4,294 listings starting at $11,999
2013 Volkswagen Passat For Sale
134 Great Deals out of 2,721 listings starting at $9,995
2012 Volkswagen Passat For Sale
146 Great Deals out of 2,325 listings starting at $7,900
2010 Volkswagen Passat For Sale
7 Great Deals out of 120 listings starting at $8,987