Quote Originally Posted by dpetersen View Post
Mate I have the same model patrol and exactly the same problem. What I found with mine was if I turn the headlights on itd go up a little bit, high beams a little more and a/c on aswell and it would jump strait up to boiling. Especially when I'm on a bumpy road with no lights or anything on it'll jump strait up to boiling as well. The only thing I have found so far to temporarily fix it is tapping the cluster and if that doesn't work I have to pretty much punch the dash until it drops back down. It's defiantly an electrical issue. Mine is exactly the same, only the temp gauge plays up, everything else is normal. I have cleaned the main earth strap and didn't make a difference. If you find out a way to fix it let me know as mine has been doing it for nearly two years now!
All your problems sound earth related as well. not sure on Patrols but on
Toyo's there was an earth strap for every section of the vehicle.
I just re-did one when I replaced the radiator, as Mudski says these Patrols
are famous for their earth issues, a few extra wont hurt lol