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Old 08-13-2003, 05:36 AM   #1
Scooby Newbie
Member#: 41705
Join Date: Aug 2003
Location: Albany,NY
1995 Legacy L Sedan
Baby Blue

Default AC jumps while riding

When i bought this car(about a year ago) the AC was fine without any problem , before the beggining of the summer when i actually started using it frequently. When i turn it on in the middle of a highway or a regular low speed ride it "jump" the car and make it feels like the compressor is on and it taking some of car's power , but the funny thing that it goes of and on every few minutes , (then tho for some reason the air that its blowing stays cold) and it makes the ride feel very wierd since the car feels bumpy every time it does that . If someone could give me some idea about what can i do to prevent that from happening i would appreciate that alot
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Old 08-13-2003, 07:17 AM   #2
Scooby Specialist
Member#: 1415
Join Date: May 2000
Chapter/Region: NWIC
Location: Anytown, USA
2008 IS350
'13 SantaFe


The cycling of the compressor pump is normal. Some cars cycle more and some cars cycle less. But it should never cycle more than once every 1 - 5 minutes (approximately). If it cycles every 30 seconds then it might need to be looked at. If it stays on all the time and never cycles again it might need to be looked at.

Sometimes an "overcharge" in the system will cause it to cycle more frequently. I believe (and don't quote me on this) with an overcharge it causes the high side to hit the high pressure limit to soon and will cut the pump off momentarily until the pressure falls back to normal levels then it starts all over again.

One thing you can do is to spray out the condensor in front of the radiator with water. Bugs get jammed in there along with every thing else and can cause it not to cool as well. Another check is to make sure your low side line off the compressor pump is nice and cold but not icy (might even be condensation on it if you live in a humid state). And the high side line off the compressor should be nice and warm or almost hot. If the air coming out of the vents is about 25 - 30 degrees below the outside ambient temperature then it's doing it's job well.

As for the "jump" I've always felt that in my car since new. The A/C compressor takes quite a bit of HP to run. The only engine I never felt the A/C pump kick on was in my V-8 Dodge Dakota. But all my other 4 or 6-cyl cars I've owned I could feel it.

If you must, you can take the car in just to have the system tested / checked. They will be able to tell you if both sides are at the correct pressure. To much pressure and the compressor has to work a lot harder and will get noisey. Not enough pressure or low R-134a and the low side line will be warm.

Just throwing it out there...
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Old 08-13-2003, 11:48 PM   #3
Scooby Specialist
Member#: 16523
Join Date: Mar 2002
Chapter/Region: MWSOC
Location: I do.

Run the AC at full blast for a few minutes, then check the presure with an AC presure sensor line. If it's overcharged, which is the likely case, release some of the gas. Don't worry, new car AC gas is enviromentally safe. (sp?)
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