A/C help please

[firemedic509]

Hey all i have a issue with my A/C. I have a 2002 ranger edge with a 3.0 after driving for about 30 mins my a/c clutch engage and disengage over and over with no rpm change and hot air coming from the vents. freon presure is good per my gauge. could i have a bad a/c clutch or compresser

thanks for the help
Andy

 

[swynx]

You test the pressure after 30 mins? My Saturn says it's fine all the time but I have a leak somewhere

 

[PanamaExpat]

try jumping the low pressure switch.

 

[firemedic509]

You test the pressure after 30 mins? My Saturn says it's fine all the time but I have a leak somewhere

i will try that

try jumping the low pressure switch.

i jumped the clutch cycling switch on the accumulator (is that the low pressure switch) with a paper clip yesterday and the compressor never kicked on

 

[snake]

Next check the clutch- should have 12V at the connector with fan on, etc. If you have 12V at the compressor, check the clutch for continuity with an ohm meter. If it ohms closed loop, clutch good. If not, clutch bad. No 12V at connector, something else is keeping it off- thermostat, high press switch, WOT switch, fan control switch, etc. Compressor should have a fuse and relay, make sure they are both good as well.

 

[kimcrwbr1]

You need to put a set of guages on it , how are checking the pressure. Every time you push the schrader valve your letting refrigerant out. Simply put if you have 4ozs or 4lbs of refrigerant the pressure is the same. When the compressor is running is when you get the pressure difference between high and low side. You allways add refrigerant into the low side, add small amounts until you get a 20 degree difference between the air goin in to the air coming out of the vents. Add it slow and let it run for 5 minutes afer you adjust the charge before you check temps. Do not overcharge if you slug liquid into the compressor you will be replacing it.

 

[kimcrwbr1]

Sorry you need to put guages on to check compressor performance. I sounds under charged to me just add refrigerant to the large line (suction) and see it it runs better it sounds like its low limit cycleing. You add refrigerant by weight not pressure. To remove refrigerant connect it to the high side when it is running.

 

[snake]

Your methods are flawed. If he has a problem, adding Freon until there is a temp change will overcharge it- no temp change keep adding...? gauges are there for a reason. The low pressure reading will change with outside temp, but rule of thumb on 134a is 35 lbs with engine revved up to 1500 rpm on low side compressor engaged of course. On the high side you shouldn't see over 250 and that is pushing it. 175-225 is more normal numbers and again will change with outside air temps. and you'd be better off removing Freon with the system slowly with it shut down from either low or high side, doesn't matter, so it doesn't lose all the oil. But I do agree if the system is totally evacuated, then add Freon by weight since you should know how much it holds.

 

[firemedic509]

thanks everyone will work on it Friday and Saturday let u know with the results r sunday