1998 V70 AWD coolant loss/overheat

[cvtech]

I have owned this V70 for a number of months. I have been driving it more recently to work out some kinks etc. and to give my self some time while working out some other kinks in my B5 A4 2.8q steering rack woes. Last week I noted that the car had some steam coming from under the hood after a drive in 90+ weather. I opened the hood and saw it was coming from driver's side near turbo area. I have also had a noteable oil leak from this area or the back of the engine that has gone undiagnosed. Coolant level appeared to be good so I just assumed it to be cooling lines to turbo cooling off. I drove and about 4 miles of stop and go Chicago traffic, I my coolant level starts flashing when I turn, ok, so I am low on coolant. I find a safe spot to stop and see there is virtually no more coolant and I can see more steam coming from turbo area. I add a couple bottles of water and limp home running heat to make sure it doesn't over heat. Only had to stop twice to let car cool off during long red light stops. I brought the car home and put it on ramps in my garage, haven't had the time to touch since. Anything I be aware of? I hope to start looking at it tonight to diagnose and fix, coolant and oil leak. Thanks. I also have P0455 and P0442 codes that have been throwing for months.

Any help would be greatly appreciated.

[cn90]

Turbo coolant hoses are fun to do, especially in an AWD model!

https://www.matthewsvolvosite.com/forums ... =1&t=55306

At this mileage, I'd consider inspecting the heater hoses too:

https://www.matthewsvolvosite.com/forums ... hp?t=69238

P0455 etc. codes, search forum for clues:

https://www.matthewsvolvosite.com/forums ... =1&t=27538

[rspi]

Ahhh, coolant roulette. Likely the turbo coolant supply hose has failed.

If you drove the car with no coolant in it, it likely blew the head.

I would replace the hose, fill the system with coolant (with the engine cold), then take it for a test drive to see if it survived.



I have replaced these from up top with the intake tube removed.

[Clockboy]

I just did this repair a couple of weeks ago. I used the info listed above and willed my way through it. Access to anything in that area is very limited. I took out the filter box air hose. That got me in the general area. I wish I had looked at it before starting as I would have also replaced not only the lower radiator hose, but the heater hoses also. The turbo hose's larger side connects behind the heater hoses and life would have been much easier removing them. I thought about it, but was afraid to start playing around with additional hoses as the car needed to be ready the next day and I did not have replacements. My experience on this car has been if you remove it expect it to break. The most frustrating part was putting the banjo bolt back in with both washers in place. There is limited room and you can't really see what is going on. I knew if the copper washers slipped off they would be lost instantly and I did not have any others. I leaned over the engine and did it from the top. No way my hands would be able to get anywhere close from the bottom. I think I finally used the right combination of curses and the bolt went in. I double checked with a mirror to make sure the washers were where they should be and tightened everything up. It would have been a much easier job without the awd components in the way. Also - a head lamp would have been really nice to have.
Adjusting lighting was one of the more frustrating aspects.

[rspi]

My experience on this car has been if you remove it expect it to break.

Amen to that. People often ask me to remove something from my car to do a video, etc. I just laugh.

[cvtech]

I don't think I blew the head, I filled with water and was very cautious not to bring car above temp. When adding water, the color of the coolant wasn't murky indicating oil and coolant mixture. Of course the expansion tank is old etc. Since I am suspecting some issue with the turbo, I am betting the coolant supply line myself.