Question about 1991 Volvo 240
The automatic transmission fitted on these models could be the AW-70, AW-70L or AW-72. The three transmissions are very similar. They are conventional in design though they are clutch-type (no brake bands) and very sturdy.
The automatic transmission is a complex unit, but if not abused, is reliable and long-lasting. Troubleshooting these units is fairly complex, so the home mechanic should be concerned with one thing to start: oil level and condition. Begin by having the idle line pressure tested when warm (it tends to drop as the oil warms up). If the level is low, ensure no leaks are present and top it off as needed (do not overfill - fill when the transmission is hot - if overfilled, this can damage the transmission as well as cause hot oil to be ejected from the fill hole) and test drive it again. Ensure to follow procedures when topping up automatic transmission oil, and ensure it is of the correct type. If the oil level is OK and line pressure is not then replacement of the oil and screen along with cleaning of the magnets should be done. The magnets are there to trap metal contaminants before they can damage the transmission.
The oil should be flushed out, filter changed and magnets cleaned at least every 80,000 miles. Have this done first to see if the problem goes away. If it persists, then the clutch pack for that gear or the valve body is suspect. If the oil is new and proper drain and flush procedures have been followed, it's possible that the check ball in the valve body is sticking once warm. What I have done with these is drop out that valve body and clean it thoroughly, provided scrupulous cleanliness is observed. While cleaning it, replace the check balls and associated springs. If this checks out OK after the maintenance, then it's possible the pistons, accumulators or clutch packs have probably worn out.
If by this point, the transmission still doesn't function normally, then replacement is the only fix. No DIY repair is recommended and may be exchanged in part exchange for a new or rebuilt unit.
Posted on Dec 22, 2014
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Nov 10, 2014 | 1991 Volvo 240
Apr 21, 2014 | 1988 Volvo 240
Dec 16, 2013 | Oldsmobile Alero Cars & Trucks
Jul 31, 2010 | 1991 Volvo 240
Oct 19, 2009 | 1991 Suzuki Sidekick
Jan 22, 2009 | 1991 Volvo 240
Jun 12, 2008 | 1989 Volvo 240
May 10, 2014 | 1991 Volvo 240
101 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: