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Car Forum / Volvo Cars / September 2005Ovedrive solenoid/Overdrive relay
Hi Everyone, I haven't posted on the newsgroup for awhile, I guess it's because up to now my 90' 765T has running great. I am having problems with the tranny. It won't shift into 4th-overdrive until the car has been driven for about 10-15 Minutes. I have replaced the kickdown cable and made sure it is adjusted properly. I just replaced the overdrive solenoid and so far no change. I will try replacing the relay next. Has anyone replaced the relay? Can the relay appear to work, it clicks when cold and upshift arrow lights up, and still be bad????? I took it out and took it apart and the solder appears to be fine with no cracks. Nothing happens when I deactivate the solenoid with the button when it's cold but when it gets warm and I know it will shift the transmission will change when the button is pushed. When the car was cold I tried to listen for the click from the solenoid when deactivating it with the switch, I didn't hear the click when deactivating or activating the solenoid. That's what led me to believe it was the solenoid because it did not click when the car was cold. Am I looking at a new tranny?? By the way the tranny was recently flushed and when I replaced the kickdown cable more clean fluid was added so the fluid is nice and clean. Any answers will be welcome. Bernie Franklin 1990 765T 200K still running. > Hi Everyone, > [quoted text clipped - 23 lines] > > Bernie Franklin 1990 765T 200K still running. My first guess would be a broken wire somewhere if the relay is ok, though hairline cracks in the solder can be hard to see so I always add some fresh solder once I've got one apart. Get the car up on ramps or jackstands, turn the key to accessory and engage the OD (arrow light off) then climb down under and check for 12v at the wire to the solenoid. If it's present, have someone engage and disengage it and listen to see if it clicks. Thanks everyone, As I am going out of town for the weekend using our other car I can't check out the solutions but I will next week and let you know how it goes. After that is a stop to the local Volvo mechanic. Bernie Franklin James, The overdrive solenoid is brand new and works when the car is warm only it takes different amounts of time before it is able to go into overdrive. Should there be 12V at the wire going to the solenoid when the car is on and overdrive engaged (shift arrow off). Have you ever had a relay be intermittent and still click like it is working? I am worried that it is the transmission itself and not the relay, which is the last thing I yet to replace. I have ordered one so it will be here in a few days but I have to drive on the freeway and can't go on until I know the overdrive works properly. Thank-you for the information James. Bernie Franklin I'd think that the 4th gear switch on the tranny wold be intermittant more so than the relay. I believe that the wires for the dash light and the solenoid are connected at the relay socket so if the dash light goes on when you push the button, the OD should work. If the dash light does not come on until everything is warmer, the relay may not be grounded by the 4th gear switch so no reaction would be more likely a bad 4th gear switch. I had intermittent overdrive problem. Finally traced fault to a bad conncetion between relay & relay connector (base). Inserting the relay had pushed the connector out underneath but was still touching the relay. We got 12v at solenoid but not enought amps to drive it properly. Took a while to track it down too . . . > I'd think that the 4th gear switch on the tranny wold be intermittant more > so than the relay. [quoted text clipped - 6 lines] > not be grounded by the 4th gear switch so no reaction would be more likely a > bad 4th gear switch. > I'd think that the 4th gear switch on the tranny wold be intermittant more > so than the relay. [quoted text clipped - 6 lines] > not be grounded by the 4th gear switch so no reaction would be more likely a > bad 4th gear switch. There isn't a 4th gear switch, it was only used on the manual transmission cars. An automatic tranny, no wonder I look funny with my foot in my mouth. ( Among other characteristics.) Why is it dark in here??? Duane > An automatic tranny, no wonder I look funny with my foot in my mouth. ( > Among other characteristics.) Why is it dark in here??? > > Duane Bless you, Duane! I was getting tired of being the befuddled one all the time. Mike > James, > > The overdrive solenoid is brand new and works when the car is warm only it > takes different amounts of time before it is able to go into overdrive. > Should there be 12V at the wire going to the solenoid when the car is on and > overdrive engaged (shift arrow off). Yes > Have you ever had a relay be intermittent and still click like it is > working? Yes, again it was the soldering. > I am worried that it is the transmission itself and not the relay, which is > the last thing I yet to replace. It does sound like the tranny to me, if you have voltage at the solenoid with the OD engaged (arrow off) then the problem is either the solenoid or the transmission. > I have ordered one so it will be here in a few days but I have to drive on > the freeway and can't go on until I know the overdrive works properly. It's no problem to go 80 mph on the freeway without the OD, remember that back in the 70's OD was an option. You'll burn a fair amount of extra fuel though, not a good thing with what it costs these days. |
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