BOUGHT THE VETTE THIS PAST MAY, A/C WORKS GOOD TAKES AWHILE FOR THE AIR TO COME THROUGH THE CORRECT DUCTS. I HAVE THE ELECTRONIC CLIMATE SYSTEM, WHEN I ADJUST THE TEMP TO THE MAX 90 DEGREES THERE IS JUST MILD HEAT BLOWING THROUGH THE DUCTS AND I NOTICED NO MATTER WHAT TEMPERATURE I SET IT ON THE A/C COMPRESSOR RUNS ALL THE TIME?

 

Grab hold of the heater core lines and compare temps of the 2 lines.

If you got Dex cool, you got the plug. Betcha'. I don't care how clear it looks at the filler reservoir...