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#1
15th December 2010, 08:47 PM
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Heater Pump Valve - what does it do exactly?
Hoping you folks will be able to help me understand what's going on with my 98 2.8Sport?
I'm getting a buzzing noise from what I think is called the pump valve, just slightly below and to the nearside of the heater/cabin air intake. It will make the noise approx 10secs after turning ignition on - engine doesn't need to be running for it to happen I followed some of the info from Elsawin and unplugged the unit from the car and sure enough the noise stops (you can actually feel the vibration when it buzzes though). I've been using the car while this is unplugged and doesn't seem any different so I'm wondering what it actually does now? Am I dmaging something by running without this plugged in? Not throwing any CEL lights etc.
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D2 2.8 Sport ('98 110,000miles and counting) 
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#2
16th December 2010, 10:34 AM
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I reacently changed the Pump and valve unit. The pump is only required when you want to heat the car with the engine off. After the water is run up to tempreture, when the engine is switched off,press the button on the climate control and the pump will circulate water through the heater matrix until it gets cold. When the engine is running water is forced through the heat exchangers by the water pump.
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Conan (the Librarian) Watch it if you dare Currently, 2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block. 1997 4.2 A8SQ - the Projekt. 12 years and ongoing! 1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard 2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion. 2005 C5 Allroad 2.5TDi FE - Grey - Workhorse. 2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter. Previously 2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex 1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure. 1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex. 2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on. 1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8. And a list of non VAG going back 40 years before I saw the light. 
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