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volvo-boost-pressure-valve-solenoid-valve?

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive P2 platform cars sold as model years 2001-2007 (North American market year designations).

2001 - 2007 V70
2001 - 2004 V70 XC (Cross Country)
2004 - 2007 XC70 (Cross Country)
2001 - 2009 S60
2003 - 2007 S60 R
2004 - 2007 V70 R

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jonahjays
Posts: 2
Joined: 25 Sep 2019, 11:06
Year and Model: 2004
Location: MA

volvo-boost-pressure-valve-solenoid-valve?

Post by jonahjays »

Hi All, I am looking for the name of a part on my 04 xc70. It has a hose from the air filter housing and another larger hose that goes down by the radiatior and another hose that goes to the engine. It is mounted to the side of the air Filter box and has an electrical connection. I thought it might be the turbo boost solenoid but when I look up that part, although similar looking it looks different .
part pictured in the fore ground
part pictured in the fore ground

jimmy57
Posts: 6676
Joined: 12 Nov 2010, 09:25
Year and Model: 2004 V70R GT, et al
Location: Ponder Texas
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Post by jimmy57 »

That is the auxilaiy vacuum pump switch. It turns on electric vacuum pump for the power brake booster whenever the engine provided vacuum is too low. This is usually in the first minute of a colder temp start when the variable valve timing and ignition timing are at settings that reduce the engine manifold vacuum to a very low level. The turbo control valve has three hoses that are about 10mm OD. It should be clipped to the air cleaner housing to opposite (backside) where this vac switch is located.

Note: that vac switch is guaranteed to break one day. If you remove it and use JB Weld metal filled epoxy and spread it around the sides to the bottom of the larger round potion as viewed in photo, it will go past the click tabs that hold the switch diaphragm chamber together. If you remove the switch and look , you will see the snap together tabs aand one will most likely already be broken. If you buy a new expensive switch from Volvo it already has been epoxied. I use the 5 minute cure version and after about 3 minutes of it being on switch it gets firmer. I wrap electrical tape around the epoxy band and it makes the repair look much better instead of looking like chewing gum was stuck on it.

jonahjays
Posts: 2
Joined: 25 Sep 2019, 11:06
Year and Model: 2004
Location: MA

Post by jonahjays »

Wow, Thanks JIMMY!

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dono
Posts: 49
Joined: 02 Apr 2007, 16:58
Year and Model: 04 V70&XC70 2.5T AWD
Location: DC Metro Area
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Post by dono »

jonahjays wrote: 25 Sep 2019, 11:19 Hi All, I am looking for the name of a part on my 04 xc70. It has a hose from the air filter housing and another larger hose that goes down by the radiatior and another hose that goes to the engine. It is mounted to the side of the air Filter box and has an electrical connection. I thought it might be the turbo boost solenoid but when I look up that part, although similar looking it looks different .20190924_095841[1].jpg
I broke this once replacing the light bulb of all things. I was in a parking lot and just used electrical tape to hold the spring-loaded top down having no idea what it was. The tape lasted about 7 months then it failed and cause the booster pump to run continuously. I decided its a cheap enough part to just go ahead and get a new one rather than do the epoxy thing. On a side note I did just replace the Volvo Boost Pressure Solenoid Valve you mentioned and it solved Cat codes and evap codes that had haunted me for 18 months. $25 for the TCV!
2004 V70 AWD Wagon 2.5L L5 DOHC 20V TURBO 260k mi :D
2004 XC70 AWD Wagon 2.5L L5 DOHC 20V TURBO 120k mi :D

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