I'm new here so lets give this a try, i have searched for answers and have gotten some ideas , but let me explain what is happen with a/c
Start car push auto for a/c , a/c cuts on but second fan does not , so 1st question is which relay in dash is for this fan , have replaced sensor at bottom radiator hose and have jumped the fan fan works. There is a second switch that screws into block or head should i replace this aswell.
One other note as a/c is cycling , when the a/c cycles off , 20 to 30 seconds later air tries to go to defrost then a/c cuts back on and blows thru vents , i don't thank this is normal ,why would it try to go to defrost.
Thanks for the help if anyone can . TWVAA