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