Installed a new compressor and condenser in the disco. AC worked prior but not well so when the old compressor started squealing ifigured it was just old and a new one would have the system working better.

Installed the parts and vacuumed the system for 45 minutes. Waited 30 min to confirm it held vacuum. Added 2 12 oz cans and weighed in the last 4oz.

Low side is 45 to 50 psi
High side is 215

AC at idle 60 degrees on 80 degree day
Driving it gets down to 50 degrees

I noticed the high side line gets hot but the low side line doesn't even get as cold as before. Actually only gets cool not cold enough for condensation to form on it.

Suggestions?

 

Did you use a machine to vacuum and fill? Or did you just use gauges? New receiver drier? New expansion valve?

Sounds like a weak compressor, low charge, or perhaps crappy expansion valve with those pressures. Just a little too low on the high side and a little too high on the low side

 

Gauges and pump to vacuum. Yes new receiver drier

Based on ambient I thought the high side was actually a bit high? Unless the Disco system likes something different than the generic r134 charts

 

 

Just checked AllData and they dont have operational pressures listed,

What year is your car? capacity is 32oz for 99-02 03-04 is 28oz

Did you add oil?

I'm also based in hawaii and completely forgot ambient temp has an effect on pressures in the system because its a non issue here haha

 

Mine is an 04 and I added 28oz per the sticker with rear air. Did not add oil in fact drained some from new compressor to match what came out of the old one.

 

Seems to be working well at speed. 47 degrees running down the hwy on an 85 degree day. I'm guessing this system is very picky about charge. I'm either a touch over or under.....

 

Those pressure readings look fine. Ambient temperature is not the only factor involved, you must consider humidity and the amount of heat exchange on account of glass, also. There's an equation you can look up for exact measurements. But, truth be told...you look to be within acceptable pressures. Normally, l like to see about 30° difference, between outside/cabin temps.

Also, if one of my A/C gauges ever called me a retard...it would be eating lead...lol.

​​​​​​​ Brian.