300 SD AC problem
#1
300 SD AC problem
AC System Not Cooling
I have a Mercedes Benz 1982 - 300SD. Because past year it had a leaking AC system I decided to change my compressor, expansion valve and receiver and flush the entire system before installing new components. After all new parts back together, new oil and refrigerant was added according with manufacturer quantities.
In the low and high gauges I have the recommended pressures but system still not cooling incoming air. Compressor is making a good compression and good suction. All main parts are brand new as described above. I had condenser, low and high lines cleaned twice and recharged but it did not helped. I am using the 134a.
What can be the problem ?
In the low and high gauges I have the recommended pressures but system still not cooling incoming air. Compressor is making a good compression and good suction. All main parts are brand new as described above. I had condenser, low and high lines cleaned twice and recharged but it did not helped. I am using the 134a.
What can be the problem ?
#2
134a is part of the problem. The system was not designed for it, the condenser is too small to handle the increased BTU load and lower efficiency.
Make sure the heater's mono valve is closing (voltage applied) and the correct flaps are opening to route airflow to the evaporator.
Make sure the heater's mono valve is closing (voltage applied) and the correct flaps are opening to route airflow to the evaporator.
Thanks for your imput.
I had heard that 134a is not good for this specific car and year.
I converted it to 134a in the past and had some, very little, cold air from vents. As R12 is not longer sold to anyone I tryied to keep working with 134a. My new compressor does not specify if it is made to 134 or R12.
Do you believe that compressors for different gases are also different compressors?
My flaps are working properly and the way that I understand, there was suppost fell the suction line to be colder than high pressure line even if flaps not working properly. I am correct?
Thanks for your response.
Nyko46
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