Td5 Auto Gearbox with a cold... Please help !

Hi I have a Disco Td5 from july 2001 and the autobox has a cold.

for the second year now, in summer the gearbox works perfect.

however there comes winter again. when the temperature drops under about 18°C he refuses to change gear from 1st to second. what i have to do is throttle up until he goes into emergency which is it's third gear. the Manual and Sport light blinking simultaneously in the dashboard.

After driving for about 25 mins i put myself on the side and restart the engine (and reset all computers) and when not too humid outside he will work again perfect. also sometimes after the restart and driving on the motorway here in Belgium with cruise control on at about 110 km/h (i never drive much faster) he shifts back to second, up to third and back to fourth. sometimes even stays in second with high revs and then into emergency.

i want to believe that the box is simply gone, but why working perfectly and smooth in summer? so can anyone help me with locating the exact problem? i would really appreciate any help, i'm still young and bought this car with my savings and at the moment not ready to afford a new gearbox...

thank you so much in advance...
greetz
Kris

I would give the gearbox an oil and filter change first, change oil and filter run it around drain oil and refill again to get the old stuff out of the torque converter. It sounds like the oil is thickening up in the cold, so someone before you got it could have put the wrong transmission fluid in.
That would be the first thing i would try.
Mark

Some say they dont need doing but I had mine done and it was sooooo smooth afterwards, check www.discovery2.co.uk out, and make sure you change the inner metal filter as well, mine was very silted up.

Good luck

ok will try that... thanks