1990 9400 eagle ac problems!!!

Is this an R-12 conversion? The low side is still rather high. What are you charging this too? Did you replace the expansion valve?

 

Do you have cutoff valves for your heater hoses? Your normal blend door/cutoff valve may not be functioning. I would check that for one thing.

 

did you change the dryer?

 

I am not sure for converted systems, but the original R-12 charge was 4.5 lbs. In 1992 was when International switched over to 134 in 9000s. The 134 charge was 3.5 lbs. Unless your converted parts specifically call for 3.0 lbs, I would recharge your system with 3.5. The change from 3 to 3.5 probably will not fix your problem. Your high side pressures are about right. With high low side pressures since you have a new expansion valve, I would look at the condenser. If the condenser is not cooling the compressed gas into a liquid the expansion valve isn't doing anything, and the change of state from a liquid back into a gas inside the evaporator is what creates the cold air. To test for a bad condenser, run the system. Spray down the condenser with a garden hose. Spray water all over it, lots of water! The cooler you get the condenser the better. If the vent temps start to get cold after a few minutes, you need a condenser.

 

you blow the coils out under the passanger seat? I had a 92 and the ac was not the best, vent set up on those are terrible.