I have just started noticing that when the A/C is on the A/C compressor clutch engages and disengages in about 30 second intervals.
Example: 30 seconds on, 10 seconds off, 30 senconds on and so forth. There is also a change in temp. from the vents as it cycles. This is all in manual mode too.

Does anybody elses GX do this?

I have talked to two different technitions at two different dealerships and both have said that it is normal and the clutch is an automatic type that will cycle itself on and off depending on the pressure in the system. I have never heard of a car that does this before, all the cars I have owned previously are either on or off, not both.

Can anybody confirm if their GX does this.

Also anybody heard of such a thing before?

 

I have noticed this as well. Especially when it is really hot outside. Not the time I want to feel the heat pick up. Bill

 

Ours does this in Auto mode too. Sometimes we'll be stopped at a light and you'll hear a click and the revs will drop about 100 for a few secs, then go back up 100 or so.

Also while driving, sometimes the A/C, even in Auto mode, will have random bursts of warm air that's slightly warmer than what it had been blowing.

We don't like the Auto A/C in the GX... it doesn't keep the temp at what we set it. We are always having to fiddle with the temp because it's always either too hot or too cold. Not like that on our other cars...

 

ours did it mostly when i bashed on the gas i'd notice i'd cut the ac

 

The A/C compressor short cycling is a known problem that Lexus is working on, per my dealerships technician.

Kash, what people at Lexus or the dealership did you deal with on your sell-back? I am looking at doing the same only for a different set of issues.

Thanks,

 

I have noticed the same issue. We need to adjust the tempearature quite frequently as well.

 

Interesting. Would you be willing to mention what dealership this is? I would love to talk to this technician. As I have said before in my first post both technicians I have talked to (at two different dealerships) have said this is a normal function of this auto clutch system. One of us isn't getting a correct answer.

 

----(SOLUTION) ----
My Lexus IS250 2007 did the same thing. My AC compressor was cycling on and off. It got hot outside 95F and it would only turn on a few seconds (about 5 sec) at 20 second intervals and would eventually stop cycling.

Solution (how i fixed the problem):
-when I checked my freon pressure was in the red.
-I recovered the freon from the low pressure valve.
-I did this until the compressor stayed on.


Hope this helps, too high pressure in the A/C lines (from it getting to hot outside) can cause the compressor to cycle.

 

People will sometimes refill their refrigerant using one of the kits you can buy at AutoZone, etc. and the problem with them is there's no way to know exactly how much refrigerant to add. Modern A/C units are very sensitive to the quantity of refrigerant in them. Always take it a qualified shop to get refilled.

Chip H.

 

I wouldn't particularly state you let the freon out online, you should say recover. agencies tend to frown upon that practice, in some states its chargeable offense

 

The next day when driving, my AC started to get progressively warmer and after 10 min it was blowing warm air. My compressor turned on for about 10 min then started to cycle again. I think there may be air in my lines from when I changed my alternator (may have bumped one of the lines ). Will update the post when I Find the "real" solution out. May have celebrated to early !

Does anyone know how to find leaks in the AC system ??