A/c clutch engauge disengauging

[sumo]

can you clarify whats 55psi?

 

[felskee]

will i couldnt get a good reading cause i had the can hooked up while it was running and when it engauged the pressure went down then when it dissengauged it when up.

 

[95TwinTT]

The AC compressor’s function is to compress gas into liquid. There a high side connection and a low side connection. A/C gauges have both a high and low gauge to measure the pressure while running.

The best way to be sure you have the exact amount of freon is to evacuate the system with a vacuum pump, checking to be sure it holds vacuum for a while before filling. Then install the exact amount of freon that is listed on the lable on the AC system. It will probably be around two or three pounds.

You should be on the Low side for filling. The compressor may have to run to get the total amount of freon into the system. The low side should be 45 to 55 psi depending on outside temperature while the compressor is running.

Showing 55 psi when the compressor is off, only means there is some freon in the system. It does not mean it has enough to function properly.

Two ways to know you have enough freon. Pump it all out and add the specific amount required, or have a set of A/C pressure gauges and the charts to tell exactly what high/low pressure you have at the ambient outside temp, while testing. Add freon to match the pressure called for on the chart……………. Freon 34, 22 and 12 have different properties, so be sure to select the correct chart………

 

[sumo]

yea sound like your not to certain. Best thing to do is to have it all Evac, Add some dye and recharge to spec.

 

[fyremanpat]

You answered your own question here. You dont have enough refrigerant. Add more till it engages and stays engaged and use that reading.

 

[Kool rider28]

sounds like you need to get it check by a certified a/c technician. put a set gauges on it to see whats you high and low side is reading

 

[felskee]

well im just afraid of over filling it. cause when i bridge it to stay on and then i put the refrigernt in it dosnt read so i cant really get a reading while its engauged. only when its disengauged

 

[sumo]

well im just afraid of over filling it. cause when i bridge it to stay on and then i put the refrigernt in it dosnt read so i cant really get a reading while its engauged. only when its disengauged

just take it in and have it done for ya. Its gonna be a pain to fill it to where it needs to be if you dont have the proper equipment to read the pressure in the system and knowing how much is in the system already

 

[youknowmyname67]

well im just afraid of over filling it. cause when i bridge it to stay on and then i put the refrigernt in it dosnt read so i cant really get a reading while its engauged. only when its disengauged

the jump for the compressor clutch is just to verify the clutch didnt sieze you dont want to keep that going or you will fry it out.... rent a vacuum pump from autozone vac the system out make sure you have a real set of ac guages (can rent those too) when you vac the system you will see the guages drop below 0 so you are in - digits.... when you have fully vac'd the system leave it on the guages give it about 20 mins or so usually i leave mine on for 30 just to make sure the guage stays below 0... if it rises back to 0 you have a leak.... (explains the lack of freon) if it stays below 0 figure out how much freon you need (how many pounds) turn the ac on max and start putting in your freon. you will notice that when you start the 2nd can of freon(assuming you buy the small cans) your compressor clutch should stay engaged) fill to the proper amount of freon and you will be alright just dont over fill the system (thats why you need to find out how many lbs your acc/dryer holds) but do not just bridge or hard wire that pigtail it will hurt you more and cost you more.... its just a temp jump for the clutch to make sure the clutch still works.

 

[JonnyTahoe]

One can is almost Never enough