livitup

Mine got the TSB, but it's still doing something... It doesn't cycle the same way, but it's doing something...

Before there would be an audible click, and a slight surge in the engine when it happened.

Now there's no sound, no surge, but it's still goes back and forth between cool and humid... it never gets really cold. I'll have to take it back in some day.

---A

VTLC

I got mine done (AC amplifier) a month ago and I still notice it, its much worst now cuz the warm air is even more humid and I get a jump in the revs everytime the AC fan turns on and off. Someitmes it feels like my car is going to stall hehehe.

starbucks

I haven't had any noticeable problems with the cycling. No unusual problems with my AC. Purchased in March '04. Vin 401....26***.

I park in a structure at work. It's been in the mid to high 80's in Los Angeles. If I drive out for lunch, the AC works great at fan speed 2, but not quite cool enough at 1. After sitting in the sun during lunch, with the moonroof tilted to vent, I need to blast the AC at max, but never really overcome the heat radiating from the dash before getting back to the office -- usually 10 minutes away or less.

I have winning blue which I'm sure sucks heat pretty well, but the above doesn't seem unusual.

srm858

I had my AC amp replaced last week. I drove home and it seemed to cycle the same as before. I used the AC again yesterday and it did not cycle and cooled adequately, but not great, and it was only 74 deg. outside. I will need to use it more to see if the problem is fixed. The AC in my VW and Honda are only OK too, so maybe it is too much to expect the interior to get really cool in a modern car.

All the other issues with the car have been taken care of. Oil usage is low, a quart every 3k and mileage is still around 19. It rolled over 11k miles and I love the car. If I don't have the flooding issue this winter, I will keep it for a long time. If it still floods, it will be gone and I will be at the Honda dealer.

Chrisbert

This from a thread I started on this topic:
Measurements made with Fan on 2, Recirculate, and Max Cool.

I bought an A/C thermometer; the kind you stuff into the vent, and I'm keeping track of the air temp.

The last couple of days here have been in the low 90s so its a good time to check it. I'm making measurements with the engine cover on and off as my theory is that the engine cover traps heat. I am making measurements in both recirculate and fresh air mode, but so far there seems to be little variance in temp.

With the engine cover on:
Idling in traffic = 50 degrees
Highway at 80 = 40-42 degrees
Feels like less CFM (cubic feet / min) of air from the vents

With the engine cover off:
Idling in traffic = 46-47 degrees
Highway at 80 = 40 degrees
Feels like more CFM from the air vents

In my garage, the compressor duty cycle is:
On for 10 seconds
Off for 5 seconds

I don't have the AC fix yet. One thing I noticed in the garage was the duty cycle of the compressor and its relationship to the main cooling fan.

I can hear 2 fans in the front of the car. One is significantly louder and beefier sounding so I figure it is the main cooling fan.

When the compressor engages, the second smaller fan comes on. But here is the weird part. If the other fan comes on while the compressor is on, it shuts off when the compressor does. I'm not sure why; just seems they should be unrelated.

I too find it odd that the engine cover could have any effect, but it seems to. I don't have a meter to measure CFM so my statistics are subjective there.

My neighbor has a very old RX7; 90-92 model. He and I were talking about it and he said that on fresh Freon it would literally freeze your face. He said it was about 34 degrees. I attribute that to the pre-ban freon most likely. The kinder-gentler refrigerant (Freon is a trademark of DuPont) we use today just doesn't get as cold.

I'm going to put this into the punchlist I am compiling for the Dealer. Data never hurts.

Chrisbert

Aesculapius

Could this have to do with MNAO's wonderful decision to pull/disable the climate control that the rest of the world gets? There was a post in this thread from someone in Europe saying that their climate control works wonderfully.

Perhaps the climate control was improperly disabled?

RX8by

Could this have to do with MNAO's wonderful decision to pull/disable the climate control that the rest of the world gets? There was a post in this thread from someone in Europe saying that their climate control works wonderfully.

I think this is the answer. It was designed for climate control and when they changed it became unbalanced. The new amplifier only makes the warm cycle longer and no cooler cycle there for less cooling over all.

rx8cited

That has not been my experience with my new amplifier. It's much better than the old one.

I don't feel the air temperature cycling like it did with the old amplifier. I've found the A/C performance with the new amplifier to be acceptable even on sunny, hot, humid 90 degree days. In stop-and-go traffic I sometimes have to keep the air control in the recirculate position to keep the air from getting too warm.

rx8cited

VTLC

My car is in the shop today for drifts to the left if steering wheel is kept at dead center and the volume on driver side is louder then the sound that comes from the pass side. I was told by dealership that this happens becauxe of the slope in the road and such. What BS they told me, I tried it on the opposite side of the road and it was even worst. So I took it in today and they put me into a Chevy Venture. OHHH, OOHHH, O the AC is so cold. Dont even need to go pass fan speed 2 or my hands would freeze on the wheel, and its 101* F today in Fresno CA.

megauo

Have you noticed the low pressure tubing going right under the engine cover to the cabin heat exchanger?

In my theory this tubing gets warm or even hot within seconds after the compressor stops (clutch engages) and this might cause the increase (or cycling) in air temps. If the engine cover is in place it makes the space around the tubing even more filled with hot materials.
I checked my GT, and found the low pressure tubing insulated all the way in the engine compartment! That seems to be the proper way to me.. I'm getting some insulation and we will see.

Chrisbert

Yes, I noticed that. It is what led me to investigate the engine cover theory. But, I think the refrigerant in that portion of the tubing has already done its job. I think the expansion valve is behind the firewall and the heat exchange takes place before we see the tubing headed back to the compressor.

Try the insulation though, and let us know.
Chrisbert

rx8cited

Well my car made a liar out of me today .

I've had the new A/C amplifier for almost a month.

Today it was 86 degrees, quite humid, I had just started driving and was going about 45 mph, A/C on, fan on speed 4, air in recirculate mode, upper level only, and I felt the vent air temperature cycling for the first time since I've had the new amplifier.

Cooling was still acceptable and I did end up having to turn the fan down a few minutes after I noticed the temperature cycling because I was getting cold. I could not feel the temperature cycling after I turned the fan down.

rx8cited

An8inLAS

I live in Las Vegas and although the TCB has improved the hot-cold-hot cycling it hasn't eliminated it. It is noticably better than before, but the air is not as cold as on my Protege.

eXentric

Well, had my amplifier replaced about a month or two ago. It still cycled but not as noticably and cooling was sufficient if moving. I did notice that the system was cooler when I ran the fan at 3 rather then 4. Doesn't make a whole lot of sense, but whatever.

Last night when I got into the car to drive home, I kicked on the A/C and something strange happened. I heard a very audbile (but not terribly loud) hissing sound and the air did not get cold. I fiddled with it for several minutes. I turned the A/C button on and off and turned the fan on and off. Every time I engaged or disengaged the A/C the hissing sound came and went. So I turned the thing off and drove home with the windows down in Houston TX

This morning I tried again. No hissing sound today, but still no cooling either. It feels like the compressor is engaging because the engine hesitates like it does when the compressor first engages, but no cooling whatsoever. I can get heat out of it by adjusting the temperature dial just fine, but setting it on its coolest setting is just like recirculating with the A/C disengaged.

I have an appointment for tomorrow morning to drop it off. I'll post the results.

eXe

srm858

I've been running the AC a bit more since the new amp. It still cycles about the same and does not get the car cool if the sun is out and it's above 75deg. I notice the new amp automatically defaults to recirc. when the AC is turned on. If I put it to fresh air, the car gets warm even on fan speed 3. I'm going to complain to the dealer and see if there are any other remedies out there.