Overdrive issues

[filterway]

Hi all,

I have a 88 4wd auto transmission. On a cold engine condition, the van goes on OD but automatically disengage for fews second and then going back to OD. When engine warm, never had this issue.

It looks like kind of hesitation on a cold state to stay on the OD.

What can cause this downshift, thermo switch issue? It looks that temperature have to do with that situation.

Thanks

[trodas22]

https://swedishcarparts.com/
Overdrive Solenoid Substitute Repair Volvo 240 740 940 OEM AW 1239928 block off plate

I have a 1985 Toyota Van that had an over drive problems.
I purchased this part that was designed by the owner of swedishcarparts in IL.
basicaly just eliminated the use of the OVD push Button.


Van Life!

[thevanburenbys]

Just another happy customer who solved his 87 4wd le overdrive issue by unplugging the thermo switch. This site is an incredible resource, feeling grateful.

[Temassi]

Probably a dumb question but wouldn't cutting the cord for the solenoid work without installing the block off plate?

[timsrv]

Cutting the cord will prevent OD operation (it needs 12V to open/allow OD). The plate is machined to simulate an activated solenoid. You can also use a Dremel with a cutting wheel to alter the "business end" of the solenoid as shown in the image below:




Just keep in mind this would not be reversible..... but not sure why you would want to reverse it. Tim

[Temassi]

Ahh that makes sense. I've got the Volvo one in the mail but now I'm temped to just try this now while I wait for it in the mail...

[donne13]

Anyone have the Volvo part # for the overdrive solenoid that works on the van transmission?

thanks