Having problems with your 1991 Mercedes-Benz 560 ?

The A/C in my 560 in weak and get worse in afternoon. At night, it good when the blower is at the lower speed.when I increase the speed of the blower the cool air will droop.

Posted / edited by AnonymousUser on : 26-10-2020

Answers :

Hi there,\012

Well problem seems in the insulation of the lines.......
ok as for the insulation of the lines will do nothing but make sure the heat moving out will go through the condenser nad not the lines.
Ok first of all AC is simply moving heat from one pointto another.
So first of all you must have proper air flow, system charge and proper adjustment of air flow and control of refrigerant.
You will notice a better performance if you use max air or a recirculate mode as then your only moving heat from inside the cabin and you and whtas coming in from outside.
With out either you are trying to cool the outside 85-1005 degree air, dehumidify it and then remove all the other stuff,,, in short it wont work but if your wife is cold switch to freshair.
If you dont have proper airflow over the condenser your system will raise the high side preasure too hich and either cycle out or blow off the excess preasure through a pop off. Then your low on refrigerant.
Proper control of the refrigerant flow is critical.
If your system has a orifice tube have it up graded to a AAOT (Automatic Adjusting Orifice Tube) or "self adjusting " .
When it the need it will throttle the flow so as to reduce the load on the compressor, keep the evaporator from being flooded with excess refrigerant( they do this sometimes when the person repairing the system tries to intall a different O tube to "boost" the cooling.
If you have a car with a POA/STV system with a Exapnsion valve with sensing tube , it can be converted and will never freeze the evap as it will keep the refrigerant flow controled much better.
As for removing the insulation why do you remove it? Simply install it and leave it alone, it wont hurt anything, period.

Repair Help & Product Troubleshooting for 1991 Mercedes-Benz 560

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