hi all,

i have a strange problem with my 93 V8, hoping some of you guys can help me..
when its warm weather (+21 degrees Celsius) the speedometer, radio, cruise control and the on board computer all stop working.
everything else seems to work just fine (rpm needle, fuel/oil meters, automatic transmission shifts like normal)
when i put the AC on for some time, everything comes back to live again (depends how warm it is, form 10 to 30min driving)

Does anyone knows whats going on here?