Below is a handy SAS diagram for Volvos with the “white” block 5-cyl engines, namely some 1996 and all 1997 850 models, S70, XC70 and V70 up to year 2000, and C70 up to year 2004.
CoryLeeS70 » Greetings Volvo community! I’ve recently purchased a 1998 Volvo S70 (N/A) on the cheap and I’m having a few problems; I was hoping someone more knowledgeable than myself could maybe steer me in the right direction in tackling these issues. I’m kind of sort of mechanically inclined so feel free to use somewhat technical jargon when responding; I plan to do the repairs myself if at all possible. I suppose I’ll begin with the radiator as the title insists.
I noticed a small trickle of coolant under the passenger side of the radiator and eventually determined that the radiator had a small crack in it so I ordered a new one. I proceeded to install the new radiator (Very fun job I might add) and changed the oil, thermostat, and the upper and lower hoses while I was down there. I finished the job, filled the car with coolant and took it for a trip around the block. The car warms up and stays in normal temperature parameters. It idles at 900 RPM and runs fine at a stand still but when I’m at speeds above 20 miles an hour the car sometimes jerks and feels as though it wants to conk out, quite scary when you’re traveling at 65mph on the highway.
I’m assuming this a fuel/air issue? This never occurred until I put the new radiator in. I suspect a vacuum line has either gone missing or has stopped functioning properly. I changed the spark plugs and wires but nothing seemed to change. I’d really like to get this car back into a decent reliable vehicle. Any insights on this would be greatly appreciated and feel free to ask any questions, I’ll be happy to answer any of them to the best of my knowledge.
erikv11 » First place to check is the little elbow on the end of the intake manifold, tucked in behind the power steering pump. It is hidden but accessible with a flashlight (for inspection) and long nose pliers (for replacing). You can see it in the diagram.
I just added a diagram for 850 non-turbo (from a 96, your 98 will be the same) to the pinned thread with vacuum diagrams (https://www.matthewsvolvosite.com/forums … f=1&t=6941), here it is again:
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