Magus2727
NAXJA Forum User
- Location
- Draper, UT
I am having AC problems. The Jeep has always had AC problems since I have owned it and I have always in the passed looked only at the low pressure side. The jeep has been acting up more so lately so last week I added a small can of recharge to the system. It did not do anything if anything it made the problem worse.
The Problem: The AC will work (normally) the AC compressor's clutch operates fine and I get cold air out the vents. at idle I can hear the aux fan turn on and the engine idle lowers due to more load on the engine. however after some undetermined length of time (varies) i will start to get warm air out the vents. I have pulled over and checked under the hood to see whats going on and the clutch does not engage. If I turn the AC off and go to vents only for once again an undetermined length of time I can then go back to the AC and it will start working.
Well Summer was coming so to try to fix this (often AC compressor not engaging is due to low pressure on the low pressure line, so i am told) I added a small can of 134a+. It helped a little (made it colder) but has made the working of the AC even more unpredictable, and even get a odd noise from the fan (I think the fan bearing is just going out and make a noise when its cold). And sometimes now the AC aux fan will stay on even when the compressor is off and does not turn back on.
Well I was dying in my jeep in the 85* weather today and its getting even hotter. so I stopped by a part store and picked up a EXChill Manifold gauge and hose set that measures low pressure and high pressure to see a better picture.
The kit came with a diagnose chart when certain conditions are met, however it did not have my condition. I have good pressure on the low pressure line. It was at 35 psi, its about 70-75* in the garage (door was open) and engine had been sitting for about 2.5 hours prior to testing. the jeep was set at MAX AC with max blower speed. The high side read 350 to 375 psi which per the dial says "ALERT" and the chart for temp says i should be around 150 to 180 psi. The Air was cold and it sat there so I waited a few min to see what it did. it stayed. the AC clutch and aux fan stayed on and engaged the entire time (no cycling). this had me worried a little bit.
After a few min every thing was still at the above pressures so I assumed it was steady state, perhaps it was not cycling because to conditions or being on MAX so I turned the climate control to normal AC and the pressure went up to 400 psi this is in the "NEED SERVICE" section. it stayed at 400 psi on the high side and the clutch continued along with the fan not to dis-engage. I turned it back to MAX AC a few min later and it stayed at the 400 psi on the high side. All the time the low side is sitting right at 35 psi. Then the high side pressure fit coupler, from the gauge set, popped off the port on the high pressure side.
Sorry for the long story, I wanted to give as much detail and things I have already covered before asking some questions.
First, what would be the case of having "normal" pressure on the low line but way high pressure on the high line?
Second what would cause the AC clutch engagement to act the way it is? Since the Fan stays on or off (usually) the clutch should be fine right? it would seam like what ever is controlling them is acting up? Should I Evac the system and replace the pressure switch and re-charge and see what happens?
This is driving me crazy, and the wife is due next month and the Jeep is the DD, so it will not be happy for anyone unless I can get the AC worked out. :hang:
Thanks in advanced to the help and suggestions, and for also getting this far in reading my short essay.
The Problem: The AC will work (normally) the AC compressor's clutch operates fine and I get cold air out the vents. at idle I can hear the aux fan turn on and the engine idle lowers due to more load on the engine. however after some undetermined length of time (varies) i will start to get warm air out the vents. I have pulled over and checked under the hood to see whats going on and the clutch does not engage. If I turn the AC off and go to vents only for once again an undetermined length of time I can then go back to the AC and it will start working.
Well Summer was coming so to try to fix this (often AC compressor not engaging is due to low pressure on the low pressure line, so i am told) I added a small can of 134a+. It helped a little (made it colder) but has made the working of the AC even more unpredictable, and even get a odd noise from the fan (I think the fan bearing is just going out and make a noise when its cold). And sometimes now the AC aux fan will stay on even when the compressor is off and does not turn back on.
Well I was dying in my jeep in the 85* weather today and its getting even hotter. so I stopped by a part store and picked up a EXChill Manifold gauge and hose set that measures low pressure and high pressure to see a better picture.
The kit came with a diagnose chart when certain conditions are met, however it did not have my condition. I have good pressure on the low pressure line. It was at 35 psi, its about 70-75* in the garage (door was open) and engine had been sitting for about 2.5 hours prior to testing. the jeep was set at MAX AC with max blower speed. The high side read 350 to 375 psi which per the dial says "ALERT" and the chart for temp says i should be around 150 to 180 psi. The Air was cold and it sat there so I waited a few min to see what it did. it stayed. the AC clutch and aux fan stayed on and engaged the entire time (no cycling). this had me worried a little bit.
After a few min every thing was still at the above pressures so I assumed it was steady state, perhaps it was not cycling because to conditions or being on MAX so I turned the climate control to normal AC and the pressure went up to 400 psi this is in the "NEED SERVICE" section. it stayed at 400 psi on the high side and the clutch continued along with the fan not to dis-engage. I turned it back to MAX AC a few min later and it stayed at the 400 psi on the high side. All the time the low side is sitting right at 35 psi. Then the high side pressure fit coupler, from the gauge set, popped off the port on the high pressure side.
Sorry for the long story, I wanted to give as much detail and things I have already covered before asking some questions.
First, what would be the case of having "normal" pressure on the low line but way high pressure on the high line?
Second what would cause the AC clutch engagement to act the way it is? Since the Fan stays on or off (usually) the clutch should be fine right? it would seam like what ever is controlling them is acting up? Should I Evac the system and replace the pressure switch and re-charge and see what happens?
This is driving me crazy, and the wife is due next month and the Jeep is the DD, so it will not be happy for anyone unless I can get the AC worked out. :hang:
Thanks in advanced to the help and suggestions, and for also getting this far in reading my short essay.