when i turn on the heater or air conditioning the engine pulses

1996 SUBARU LEGACY
191,876 MILES
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87BRANDONC
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A while back i added some freeon the the ac unit following the direction on the can once i did that when the ac was on the engine would pulse and make a squeeling noise but not when the heater was on. Now it does it even when the heater is on. Is there a way to flush those ac lines or something else i can do to fix this issue?
Sep 27, 2013 at 1:45 PM
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MHPAUTOS
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Adding refrigerant with out knowing the exact charge in the system is fraught with danger, the system must be evacuated using a discharge machine and not allowed to escape to the atmosphere. with the system empty you first need to vac down the system and ensure that there are no leaks, conversely you should pressurise the system with comp air and also check for leaks, (a pressure leak may seal as a vacuum leak and visa versa) as you have had the need to add refrigerant there must be a leak in the system, and this should be rectified first. With the integrity of the system confirmed, the correct weight of refrigerant can be added, this should be done with a A/C charging station which can accurately weigh the refrigerant that is added to the system.
Sep 27, 2013 at 5:02 PM