1992 Ok last summer I had a new A/C unit installed. Worked OK Now when I turn the A/C to Max nothing blows out. It like shuts off. The A/C unit is running and you can hear the fan motor blowing but nothing is coming out. When I switch to Normal it blows out ,BUT the air is not COLD. ITs COOL actually luke warm. Trying to find the problem resistors ?? The shop has recharged the unit many times but still not really cold air. Appreciate any help. Thanks

 

I think your resistors are fine.

It sounds like your diverter doors aren't working. You may have a vacuum leak too.

 

Thank you I appreciate the reply. Now I have something to go on. I will definitely check in to it this week.