A/C System Troubleshooting

So I just changed my A/C compressor, and fill my system with the proper level of oil and Freon. When i ran my A/C, my Low Pressure side was at -24 and my High Pressure was at 125, when my truck is cooled down at not running, my balance pressure is at 80psi on high and low side. I read that it’s due to my A/C system being clogged. And yes I did run a vacuum before running Freon through.

If some could help me figure out how to find the clog or know what general area it would be in.

 

With your engine Shut Off the pressures will balance ! Your saying that after charging the system still does not Cool or allow the compressor clutch to engage?

Your vacuum pulled in the refrigerant to the system when it was empty?

 

Your bio data shows a 2015... did you post in the wrong forum?

 

If you have -24 on the low side and 125 on the high side then you have a restriction somewhere. Sometimes if you run it for a minute or two you'll see the lines frost up at and after the restriction point.

Based on the fact you replaced your compressor, i'm going to assume the old one failed internally which would of sent shrapnel through the system. This is usually evidenced by removing the hose from inlet to the TXV or Orifice tube( I think these trucks had a TXV valve but I don't know) and see if you see shrapnel there. You may even see some if you remove the high pressure hose off the compressor.

If you do then at the least you'll need to replace the TXV valve and receiver-drier as the drier is the A/C system filter and the TXV is near impossible to clean fully.

You can try flushing the A/C lines, Evaporator and Condenser with Alcohol or a proper made flushing compound for A/C systems but you may have to replace everything including your new compressor again as the shrapnel sometimes can't be cleaned out fully and any shrapnel getting to your new compressor will just destroy it and send more shrapnel through the system.

 

I used a vacuum to make sure my lines are holding tightly and to remove moisture. I left the vacuum pressure in my A/C system

I have a 1st gen and a 2nd gen

 

As you should

 

Poor air flow. Do you have the low pressure switch bypassed? Could also be a low charge.

 

Ok then we are working with a 1st gen tacoma... it does make a difference, sorry. As mentioned above the expansion valve is the place to start. These are usually pretty robust items and not prone to failure. Taking the evaporator housing out is straight forward with no surprises. When you take the expansion valve out look to see if there are metal bits, if there are then you have a tough decision to make. If the bits made it past the condensor, it is usually the crap catcher of the system, then you have to figure the whole system is contaminated. The only thing salvagable might be the lines, everything else should be replaced.

 

At this point we know the compressor is efficient since it can pull a vacuum according to the op. If there are "metal bits" present, blow the system clear as possible with high pressure, recharge the system and see where you stand. No sense in spending a fortune by replacing everything just because of a restriction. A restriction doesn't automatically translate to a catastrophe. Best of luck to you.