When the temperature outside exceeds 18/19 degrees the dash board lights go crazy flashing and the needles fluctuate, the indicators, electric windows and locking system all fail while they are flashing. Been to garage, had new computer system installed and a complete new heater panel. Problem...

When the temperature outside exceeds 18/19 degrees the dash board lights go crazy flashing and the needles fluctuate, the indicators, electric windows and locking system all fail while they are flashing. Been to garage, had new computer system installed and a complete new heater panel. Problem...