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The gauge should be in the green at all times, also if the compressor is making noise you may want to add a/c oil, but you will have to evacuate some freon, if you are adding freon may have a leak or a partially clog system and the freon gets forced out under high pressure
It holds 30 oz.of R134. Temperature is relevant to refrigerant the warmer it gets the higher the pressure. If the air coming out of the ducts feels cold and "Crisp" you have enough. A/C service centers usually evacuate all the refrigerant and recharge with the specified amount. I hope this helps. Take care.
Your going to have to check that the compressor is turning the clutch (center of the pulley) get a set of A/C gauges and check for any freon in the system (static test) high pressure side should read above 200 psi, remove the low pressure cut out switch electrical connector and place a jumper wire between the two wires, this should activate the compressor, the gauges will now tell you how much freon is in the system, the high side needs to read 150 PSI to activate the cooling fans, place a temp gauge in the cener inside vent, place the fan on low, temp coming out of the vent should read around 45-50 at idle, now if you have to add freon that means you have a leak, put dye in the system, and check for leaks.
somewhere around 1.6 pounds (1lb.14ounces) of R134a if system is evacuated and 3 ounces of oil with new compressor. keep pressure on the low side around 34-37psi & it should blow snow. Below are normal car AC pressure readings with 134A.
Normal readings on high and low side with AC OFF (static pressure) – Depends on outside temperature, but normally is between 80-105 PSI
Normal low side reading with AC on high speed and MAX & engine at 800-1000 RPM’s – Ranges from 25-35 PSI –
Normal high side reading ranges from 200-350 PSI
Don’t assume that if adding little Freon is good that adding a lot is better! Overcharging just a little can decrease the performance of the system and possibly damage the compressor.
DIY recharge kit:
With the AC on the coldest setting, use a thermometer in a middle vent. Normal vent temperature readings will vary depending on the (ambient) outside temp. The vent temperature should range from around 42-55 degrees in my experience. If normal gauge readings are obtained and the vent air is cold – STOP don’t overcharge the system.
Thank you for using fixya and be safe.
COULD BE A FEW DIFFERENT THINGS. HAVE YOU TRIED TO SWAP THE A/C RELAY FOR ANOTHER? IT COULD BE A BAD ACCUMULATOR SWITCH OR A CLOGGED ORIFICE TUBE, OR A DEFECTIVE LOW PRESSURE CUT-OFF SWITCH. TOO MANY TO LIST. TRY THE RELAY AND LET ME KNOW. HOPE THIS HELPS. BEST OF LUCK. THANKS FOR USING FIX-YA AND HONEST RATING IN ADVANCE.
If your compressor is working the low side should be 15-38 psi. If you have 100 psi that means the compressor is not doing what it should. Make sure the outer clutch is engaged with the pully. If not A/C system check should be done.
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