It's probably fried, but you ALWAYS should have an external tranny cooler installed on any car that you tow with. What weight were you towing? JRL, Thanks for your reply. I've asked our local Volvo dealer about changing the transmission fluid, but they said it was a sealed unit?? - I'll try asking ...

Hi. I have a June 2003, XC70 with an automatic 2.4 litre engine and AWD, which I've owned from new. A few times a year we tow our caravan (approx 1600kg) off on holiday. After towing for about an hour the gearbox knocks into 'safe mode' (i.e. can't get into 5th gear and can't use manual shift). A wa...