Rough idle with ac on
Group: alt.autos.4x4.chevy-trucks Date: Sun, Nov 16, 2003, 7:16pm
(CST+6) From: firstname.lastname@example.org (VLH)
Got a 95 Blazer. Is it normal for the engine to idle a little rough with
the ac switched on?
RPM goes constantly up or down about 100 each time the ac makes a loud
click with a couple of seconds distance. Has been this way since i
bought the truck and the previous owner tells me it has been this way
since he got it 4 years ago.
sounds like you compressor is drawing to much voltage when it kicks
on....The Click is our compressor kicking off and on....
It is the compressor engaging and disengaging. Each time it does this it
adds (or reduces) the drag on the motor. When it is not engaged, the pull
spins freely, when it is engaged, it is using power from the motor to
accomplish it's task. You don't notice it on other things because they all
run constantly (waterpump, alternator etc.) So unlike what Steve would lead
you to believe, this is normal. My 88 S-10 does the exact same thing, has
done so for the 10 years I have owned it. Every other S-10 I have been in
has also exhibited this exact same thing.
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