I like the ratio of 1/4 oz per pound as it circulates adequately.Ī/C is not hard to work with but the control of it can be troublesome. This will make finding leaks very easy should they happen. Save yourself future headaches by dumping a 1 oz shot of flourescent dye into the system for anything that has a capacity over four pounds of total refrigerant capacity. When you charge a system with multiple TXV's in the complete system, ensure everything is operating meaning the sleeper and cab a/c in enabled, and blowers are operating through clean filters. The integrity of automotive systems and the head/temperature pressures these systems operate at needs improvement. Given the system will be an R-134A system it is probably low on charge. If the temperature is about equal this can be a factor of either a malfunctioning TXV, (sticking), or a low refrigerant charge. Locate the TXV, (thermostatic expansion valve) just ahead of the evaporator in the sleeper and the inlet side should be warm to hot, with the outlet side being much colder. I've even seen an orifice tube used for the cab, and a mechanical TXV used for the sleeper. Most truck cab sleeper arrangments I've worked with use a separate expansion device for the sleeper from the cab. If I understand correctly you have adequate airflow or discharge from the vents in the sleeper berth.
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