i just had to replace the evaporator in our 2007 Toyota 4Runner that had a leak. I was told tho required taking the entire dashboard out to the firewall.
it took 2 days and cost $900 total (about $360 for the core and the rest labor and shop).
Now the A/C is cold again but I have an intermittent sound that was not present before from behind the dashboard that sounds like a hospital ventilator or Darth Vader.
The shop hooked it back up and could hear it and see a pressure fluctuation each time it occurred. They drained and refilled the coolant with no result. Now the think it is a valve/ regulator (they say there is only one in the system). so i’m wondering why this would start happening now? could the evapotrator they put in be bad? did they cause it? should they have changed that valve at the same time? and if it will cost me $900 again?!