Hi All,

I have a '98 V70 N/A with the automatic climate control (ECC). Like so many others have described here before me, I experice the compressor going on/off on what I believe to be a too frequent basis - but only in some instances. Here are my observations:
- System will give cold air and reach and maintain setpoint within comfortable margins (perhaps I should mention here that I live in Denmark where temperatures rarely go beyond 85F). No blinking lights :-)
- Compressor will stay engaged if I set the temperature setting at minimum (blue/cold/max. load...)
- I usually set the system at 70F. Once cabin temperature has reached setpoint, compressor will kick in and out every 5 sec. or so (with noticeable load/unload of engine) :-(
- I had an A/C chap reading pressure at low pressure side of compressor and it corresponded to -2 to -4 deg. C (28 - 25 F) (sorry I can remember the pressure value). He added 250 grams (~0.55 lbs) of R134a to the system which didn't change the cycling of the compressor.

I guess you can say that it is a small problem, since I am able to get the temperature I want. However, I am just worried that something is wrong and that it may not be healthy for the compressor to kick in and out all the time.

What kind of cycling time of the compressor would you say is normal for at healthy system? Would the cycling time be dependent on the load (i.e. difference of outside temp/amount of sun and the cabin setpoint)?

I seem to recall having seen a write-up or manual of the logics of the EEC control system (may not have been on this site) but I can't find it now. If anyone can point me in direction of such a write-up, I would be most grateful.

Your input to the above will be much appreciated, Thank you!

Nikolaj