So my compressor turns on for a few seconds....then it cuts off. Then a few seconds later it turns on again, the cuts off....any ideas why? Or how i could fix it?

 

Could be a number of different reasons. Is the system properly charged? Over charged? Do the condensor fan/s run? Do you have a set of gauges to check pressures?

 

Ok, well the system was carged up properly. The problem is in the low pressure switch....it cuts the compresser off and then turns it back on. When i bypass the switch it runs fine. Do those switches have a tendency of going out?

 

it could very well be the switch is bad.......try switching it with a known good one........borrow one from a freinds car or something......

 

unfortunately in doing that i lose my 134

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EJ8 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote"> The problem is in the low pressure switch....it cuts the compresser off and then turns it back on. When i bypass the switch it runs fine. Do those switches have a tendency of going out?</TD></TR></TABLE>
Not very often, i've seen a few. I'd verify the system pressures are staying in a reasonable range.

eiti&gt; it's a low/high switch

 

So what happens if say the system is overcharged wtih too much oil but not enough coolant?

 

i just am totally at a loss at what to do. The AC works for a few min then the box inside the cabin starts hissing and the compressor turns off :-(

 

You need to hook up some pressure gauges to the low and high sides of your system. Run the A/C and watch the pressures. The low side should be anywhere around 30-45psi depending. The high should not be over 300psi. At most 250. There can be a number of reasons why its cycling. The pressure switch could be going out. But usually the number one cause of compressor cycling is due to low refrigerant. The hissing sound from your evaporator usually is an indicator. (Thats how it was in mine anyways). It could be a bad expansion valve. You will have to evacuate the system and replace the parts if bad. I suggest injecting some dye in there to look for leaks. Add oil if low on oil. (If you have a leak, usually oil is lost in the process.) You will need to find out the correct type of oil used in the system and how many total ounces. Too much oil is bad for the compressor as is too little. It has to be the correct amount. If you do open your system up, be sure to replace your receiver/drier. Put it all back together and vacuum the system. Make sure the vacuum holds. Then recharge back with the proper amount of coolant.

 

it is normal for the ac compressor clutch to turn on and off how fast does is cycle
how long does it run and how long is it off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hashman007 &raquo;</TD></TR><TR><TD CLASS="quote">You need to hook up some pressure gauges to the low and high sides of your system. Run the A/C and watch the pressures. The low side should be anywhere around 30-45psi depending. The high should not be over 300psi. At most 250. There can be a number of reasons why its cycling. The pressure switch could be going out. But usually the number one cause of compressor cycling is due to low refrigerant. The hissing sound from your evaporator usually is an indicator. (Thats how it was in mine anyways). It could be a bad expansion valve. You will have to evacuate the system and replace the parts if bad. I suggest injecting some dye in there to look for leaks. Add oil if low on oil. (If you have a leak, usually oil is lost in the process.) You will need to find out the correct type of oil used in the system and how many total ounces. Too much oil is bad for the compressor as is too little. It has to be the correct amount. If you do open your system up, be sure to replace your receiver/drier. Put it all back together and vacuum the system. Make sure the vacuum holds. Then recharge back with the proper amount of coolant. </TD></TR></TABLE>

Listen to hashman007, he knows what he is talking about...But you can also see if you ac system is working properly by feeling. On a correctly working A/C system the low side line should be cold to the touch and the high side line should be hot. That is one of the way, but the best way is hooking the system up to AC manifold gauges.