A/C compressor turning off at idle..

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02-03-2009
comm

A/C compressor turning off at idle..

Hi guys, has anyone seen this problem before? Wots happening is, A/c is on and cooling fine (plenty of gas, tried over and under gassing unit) when idling in Park (650rpm) stays on even forcing down to 450rpm in Park...
As soon as it is placed in Drive (550rpm) the compressor cuts out. Even forcing the idle up to 690rpm in Drive does not bring the compressor back on, it will come on at about 720rpm.. Are there any adjustable tables or parameters that control the A/c besides the pressure sensor? as when logging the sensor, the compressor, in this situation doesn"t respond.
02-03-2009
jimmyblue

I was having problems with the compressor cycling
when the idle was too unstable. I forget now, what
made it quit flaking; probably just getting the idle
cleaned up. I also had it cycling at low cruise and
that was a pisser, at stop-signs etc. I know I got
some advice about it here, maybe search it up.

Take a look at the A/C cutout vs RPM tables, some
models required 0 RPM (so basically key-off, key-on)
to re-engage once cut off.
02-04-2009
MCBRIZ

Check your stall saver tables that might be where your problem is.
02-06-2009
comm

Hey guys ur spot on, the dam stall saver, zeroed out the table and all good.

Thanks a million its over 100 degrees here today... lol
05-28-2010
Christian GM

fixed exactly the same issue today thanks to this post.
thanks a lot!!!
06-19-2010
niceguy

Quote:

Originally Posted by MCBRIZ

Check your stall saver tables that might be where your problem is.

Where are the stall saver tables?
06-23-2010
MCBRIZ

Go into engine tables then idle rpm table you will find them there.