Well warm weather is upon us in upstate NY. My 300's ac performance.. well.. sucks to say the least. My buddy evacuated the system, pulled a vacuum for an hour and recharged to 1 lbs 8.5 oz, which is just a hair under the 1.628? pounds of R-134 it takes. When it was in the 60's and 70's it worked great. There were a few times going down the road you'd get a blast of not so cool air then it would go back to ice cubes. Fast forward today I was on my way home from work and it was barely cool. Ambient temp was around 92F. After driving at 60 for about 30 minutes it would cool down but as soon as I stop it would blow warm. Start driving and it would cool down again. That was very annoying for a 3 hour ride.
Once I got home I let it idle for 10 mins on max ac. It was barely cool in the car. The fans are working, both are churning on low and kicking up on high. The low side is COLD and the high side is HOT like it should be. I threw my gauges on it, well just the high side. I could NOT get the service cap off the low side, my buddy tightened it very tight and it's not very easily accessible. The high side read 250 psi at idle or 2000 rpm. I drove my wifes Avenger around and her ac is ice cubes regardless of speed. When it cooled off tonight it worked find at speed but was still warm at idle.
What could the cause of this be? I don't think the condenser is faulty because the suction line is very cold and the discharge side is hot. Do you thing that the expansion valve is starting to go out? I might add the compressor isn't cycling, it's on all the time.
Once I got home I let it idle for 10 mins on max ac. It was barely cool in the car. The fans are working, both are churning on low and kicking up on high. The low side is COLD and the high side is HOT like it should be. I threw my gauges on it, well just the high side. I could NOT get the service cap off the low side, my buddy tightened it very tight and it's not very easily accessible. The high side read 250 psi at idle or 2000 rpm. I drove my wifes Avenger around and her ac is ice cubes regardless of speed. When it cooled off tonight it worked find at speed but was still warm at idle.
What could the cause of this be? I don't think the condenser is faulty because the suction line is very cold and the discharge side is hot. Do you thing that the expansion valve is starting to go out? I might add the compressor isn't cycling, it's on all the time.