well i seem to be having issues with my 96 ls. if i drive around during the day the temp will rise but it wont rise at night unless i have the a/c on for a lengthy time. here's where it gets weird....during the day as soon as the temp gauge goes up...if i close my sunroof the gauge needle will actually move up more....now ive changed everything in the cooling system at least twice....the only thing im not sure of is that i switched out the coolant sending units with the ones off a d15....if anyone has any ideas ill be much in debt. thanks ahead