This is a discussion on Is this normal? within the RAM 1500 Diesel General Discussion forums, part of the RAM 1500 EcoDiesel Forum category; Take some temperature readings before making a refrigeration charge status determination. Keep in mind the system uses a refrigerant subcooler, what where you take your ...
Take some temperature readings before making a refrigeration charge status determination. Keep in mind the system uses a refrigerant subcooler, what where you take your temperature readings.
Ok, this is where I'm at:
AC Low and fan full speed at the vent I am reading 32F. Pressure for low is 40psi and high is around 235 psi. This is telling me I'm under charged and I'm possibly freezing over
what's the ambient temperature? You have a 9°F evaporator and it's blowing 32°F air. Check the suction line temperature, it maybe frosting and your discharge isn't really all that low. When your low on refrigerant, the supply temp is usually warmer than expected not colder.
I would start to suspect a plugged filter, plugged evap or airflow restriction.
Use a temperature probe, those IR sensors are garbage for diagnosis work.
Need a physical style temp sensor like a meat probe infrared style does not work well for that test it with max ac on and at a high idle.
So picked up a probe, while driving home, about 5 miles, was reading 43F, full ac. Had no noise either, put it to auto at 73F and at idle the noise came back around 10 minutes
Have you checked if the previous owner added an air filter? You have to drop the lower glovebox to get at it. There is a removable door right above the blower.