Hi Everyone! I'm New here, I have a problem with my air conditioning on my 2000 S2000 that I can't seem to figure out. About a month ago my AC compressor went out so I got a new one from a car that had like 20k miles on it. Installed it went to an AC shop they hooked it up to a machine that does vacuume suction to get all the old stuff out of the lines and got it recharged. But it's blowing hot air... They repeated the process 4 more times to flush the system. And still the problem precists. Took the car to the dealer they daignosed it for 3 hours and said that its the expansion valve not working and that it would be $430 te replace. I went got the new valve for $30 and changed it in like 15 minutes also took an air compressor and cleaned out all the lines and the condenssor, to make sure there wasn't any clogs or crap in the system put everything back, went got it recharged and what do you know still blows hot air... the clutch ingages and the fan kicks in, the pressure checks out. But the AC is still blowing hot air. The Dealer and two AC shops dont know whats wrong. Please Help!

 

Basics.
20-30 lbs low side
150-250 high...
right amount of oil,
correct amount of 134,
radiator fan on,
heater valve cable is turning heat valve off,
etc...

 

the above

blowing hot means the compressor isn't work or there is a leak. It's really a simple system

 

What Fasting said. You had it evacuated and charged at a shop so _hopefully_ we can assume the oil and refrigerant charge is correct. So, When you turn on the A/C,

Does the compressor click on?
Does the fan turn on?
What are the pressures?

 

Yes pressure is there and the ac clutch engages and the Fan starts up. I also changed the AC Drier unit today. Ill charge it up again tomorrow to see if that helps.

 

^ This. Your heater knob may be turned to the "cold" end but is the actual heater valve near the battery being moved to the closed position?

 

simple check: are the lines under the hood getting ice cold?

 

The heater control is working, that's the first thing we checked.

The AC lines are not getting cold, they are warm when the ac is running, and the condenser is warm.

 

Does any one have the AC line routing diagram? I want to make sure the AC hoses were connected properly when the AC compressor was changed or a picture of what hose goes where.

 

Compressor > condenser > drier > expansion valve / evaporator > compressor

You said pressure is "there." That doesn't mean anything. WHAT are the pressures, low and high side, with the system running and without? If it's not something obvious like the heater valve then that is step 1 to troubleshooting.