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To All:
Im new to this Web site, but not a rookie when it comes to Auto repair. I'll get to the point on this. Just received our Volvo back from an Independent garage. Had the timing belt changed, serpentine belt replaced, tires rotated and balanced and dreaded Check Engine Light diagnosed. Shop called and advised that I had two (2) codes, one for the engine side and one for the transmission side. Tranny code was a faulty econo\sport switch, replaced and fixed, the other was a code for moisture in the Air pump. Shop recommended that the pump be drained and cleaned and code reset but might need check valve if check engine light comes back on. I agreed to the repairs, but after getting the vehicle back and driving approximately 138 miles, the Check Engine light came back on just as they indicated that it might.When we bought our new car, I negotiated several Volvo manuals with the car and one of the manuals contained information about the removal and installation of the Air pump. It advised that the battery must be removed and battery tray removed to access it.
The light bulb then went off in my head about this repair the shop was supposed to have performed on this air pump. If the battery was removed to access this pump, then my radio automatically goes off and cannot be turned back on unless you know the secret theft code it requires to power it back up, not to mention you have to reprogram all of the stations you want to listen to again. When I picked up the vehicle from the shop, radio worked great and all stations did not have to be programmed, not to mention the time and temp on the dash was correct and in Farenheit.
I then proceded to remove the battery tonight and battery tray to access the pump after removing the rock shield from under the car. It appeared that the pump had never been touched as the factory clamps were still in place and the pump had about 12 oz. of water in it as I drained into a ratio beaker I use for mixing two stroke oil.
After reviewing my receipt from this shop, they charged me $90 bucks to R & I pump and drain water. obviously, after 138 miles, 12 oz of water cannot possibly accumulate. I called the shop and discussed my concern with the shop mananger and advised that to remove the pump you must first remove the battery and battery tray, he agreed, also I advised that my radio stations were still programmed and the radio worked. I advised that when the battery is removed, you must know the theft code to power up the radio. He was silent at this point, as he realized that his tech did not touch my pump to drain the water out as listed on the receipt. We then discused the clearing of the code after my draining of the water and if the OBD will keep code clear. He thought that it would.
Manager did not offer any assistance on this matter during our conversation as Im sure they get alot of tech freaks out there, but I know he probably went to pull the receipt after our conversation and had a long talk with the tech about the repairs to our car.
Anyway.... today I stopped by another Local Volvo dealership and discussed by Airpump problem. Tech advised that Volvo is having some problems with moisture getting into Airpump from exhaust. Apparently, a check valve that sits on top of the turbo has a two way valve in it, and when the valve goes bad it directs the moisture to the airpump and if not checked, you will have to replace valve $90 bucks, and the airpump $297.00. At present I have drained the water, reset the check engine light by disconnecting the battery for several hours, hopefully this will remove it from OBD memory. If light comes back on,, I will then purchase check valve and try again.
Our Volvo has 68k, with no problems until check engine light came on,,, so any 850 owners out there, might want to check the airpump to see if it contains moisture and or water build up from exhaust.
1. raise vehicle, ramps etc.
2. disconnect battery
3. remove battery and battery tray
4. under car, remove stone shield, two bolts, one on each side and slide
shield back and down as three clips will displace from bumper cover.
5. disconnect connections of airpump.
6. remove three nuts holding air pump
7. at battery area, lift air pump up and remove two (2) hoses, one large and one small. I did not reuse factory clamps, as I replaced with worm gear type.
8. you might want to get drain pan under car at this point, tilt pump to either side and see if any water drains out. also, in back of pump you have two electrical connections, very gently, pry off black cover and lift rubber seal out and see if water comes out, mine did and It flowed out this connection.
Note: When disconnecting battery, radio will power down and once battery is reconnected, you must have "code" to power radio back up. Anti theft device. If you do not know your code, call your dealer and provide your vin number and possibly he may give your code, but over the phone I doubt it.
At this point, I'll keep my fingers crossed that my check engine light does not come back on.....but will let all know how this turns out.
M. Shrout 97 850 GLT
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