AC not working

[AC Mech]

2004 Cobra... after sitting for a year my air conditioner not blowing cold. The compressor short cycles which normally indicates low charge, however checking with gauge the charge is spot on. I jumpered the cycling switch so the compressor would constantly run.

The result was the metal ac lines got frosty, but no cold air coming from the vents. I then thought maybe a blend door issue but if i turn the temp to heat it blows hot air. If the temp dial turned full left(cold) ambient air temp comes out.

I am not sure what else to look for...any help appreciated

 

[DSG2003Mach1]

what pressures did you get for high and low side and what was the ambient temp? Compressor running or not?


I mean the blend door might not actually be moving to full cold but not sure how to verify. Is the cooling fan coming on shortly after the compressor comes on?

 

[MG0h3]

Hmmmm. Never got into AC work much but sounds like the charge isn’t getting to the evaporator

But if the lines are freezing over, it’s evaporating somewhere.

Maybe it is just a blend door thing.


Sent from my iPhone using svtperformance.com

 

[hotcobra03]

All the hvac is controlled by vacuum.

there are some recent threads with same issue where you can get more information

manual link is also posted in them

For a fast check.

2 tiny plastic hoses go in thru heater line area

1 is for boost guage
Other is hvac.

open glove box

behind is where these are coming in

there is a check valve and a tank.

than line leads to a junction of hoses

each running to doors to divert air