PNP replacement and ARW?
#1
02-07-2014, 12:35 PM
PNP replacement and ARW?
Hello,
I am in the process of replacing the PNP switch on a 1995 850 and I found a plastic hose that is broken off and according to the vacuum hose diagram should be connected to the ARW. Where is this thing and what is it? Also does anybody have a good right up with photos for the PNP adjustment?
Thanks!
I am in the process of replacing the PNP switch on a 1995 850 and I found a plastic hose that is broken off and according to the vacuum hose diagram should be connected to the ARW. Where is this thing and what is it? Also does anybody have a good right up with photos for the PNP adjustment?
Thanks!
#2
02-10-2014, 12:22 AM
Administrator
Here are some show and tells
http://www.matthewsvolvosite.com/for...hp?f=1&t=29930
http://www.matthewsvolvosite.com/for...?p=57963#57963
Cut and pasted from another site:
I don't know what the ARW stands for but i had the same purple line that goes to a check valve for the SAS pump which happens to be located above the rear of the turbo. it also has a hose coming off of it about 1" dia that trails back to the SAS pump itself. im not 100% sure but seeing as i have never changed the actual hose (just the elbows) i would assume that we are talking about the same line. it comes from right under the lip above the radiator which is the SAS relay then snakes back toward that check valve like i mentioned. The check valve itself is a common failure point. once it goes bad it allows moisture to build up in the pump rendering the air pump a sump pump. The check valve it self isnt pricey but after it craps out you typically ruin the pump PRICEY!. The best thing to do if you have to replace your pump is to drill some holes in the bottom of it incase there is moisture or water build up it can drain rather than ruining the bearings of the pump. after that usually all you have to replace is the check valve. or also look up the thread about SAS delete. Personally i have my check valve pumping to nothing and the SAS itselft does nothing other than pump luke warm air to nowhere. i plan on removing it but you will get a CEL if not done properly. The pump usually only runs for 2 minutes on cold start up or depending on the condition. I have had it come on after a long drive after coming to a stop light. Basically its useless and meant to pre-heat your catalytic converter to be come more efficient sooner resulting in lower emissions.
It seems to be the air pump check valve if you have an air pump.
http://www.matthewsvolvosite.com/for...hp?f=1&t=29930
http://www.matthewsvolvosite.com/for...?p=57963#57963
Cut and pasted from another site:
I don't know what the ARW stands for but i had the same purple line that goes to a check valve for the SAS pump which happens to be located above the rear of the turbo. it also has a hose coming off of it about 1" dia that trails back to the SAS pump itself. im not 100% sure but seeing as i have never changed the actual hose (just the elbows) i would assume that we are talking about the same line. it comes from right under the lip above the radiator which is the SAS relay then snakes back toward that check valve like i mentioned. The check valve itself is a common failure point. once it goes bad it allows moisture to build up in the pump rendering the air pump a sump pump. The check valve it self isnt pricey but after it craps out you typically ruin the pump PRICEY!. The best thing to do if you have to replace your pump is to drill some holes in the bottom of it incase there is moisture or water build up it can drain rather than ruining the bearings of the pump. after that usually all you have to replace is the check valve. or also look up the thread about SAS delete. Personally i have my check valve pumping to nothing and the SAS itselft does nothing other than pump luke warm air to nowhere. i plan on removing it but you will get a CEL if not done properly. The pump usually only runs for 2 minutes on cold start up or depending on the condition. I have had it come on after a long drive after coming to a stop light. Basically its useless and meant to pre-heat your catalytic converter to be come more efficient sooner resulting in lower emissions.
It seems to be the air pump check valve if you have an air pump.
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