Hey guys
So currently on my way to Sydney and driving my girlfriend's 1989 toyota corolla seca (auto) and whenever the water temperature goes to the lowest point the overdrive turns off.
This seems to happen constantly when driving on cold nights and going down hills.
Tried pulling the car over and letting it heat up, but when we started driving the water temperature dropped back down again and overdrive stopped working.
It only ever happens when the water temperature drops down below cold.