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by **Bad93Cummins** » Tue Sep 08, 2009 12:33 pm

I have a 1993 D250 auto, with the a/c on and the truck in gear the truck will start to bog, the volt meter will go below 8 volts but without a/c the truck is fine. What could be going on? Also the battery and alternator are good, I had them both tested.

Thanks

by **PToombs** » Tue Sep 08, 2009 5:34 pm

I'd check the compressor. Either the clutch is shorting out or seizing, or the compressor is seizing.

by **Richie O** » Tue Sep 08, 2009 5:52 pm

Idle to low??

by **Bad93Cummins** » Tue Sep 08, 2009 6:52 pm

PToombs wrote:I'd check the compressor. Either the clutch is shorting out or seizing, or the compressor is seizing.

Never thought of the compressor or clutch, ill have to check it out friday I got off work.

Thanks

by **Bad93Cummins** » Wed Sep 09, 2009 11:42 am

Well don't think its the compressor or clutch casuse the air does blow and it blows pretty cool.

Will find out about idle this week I get my tach insatlled

by **PToombs** » Wed Sep 09, 2009 6:31 pm

Bad93Cummins wrote:Well don't think its the compressor or clutch casuse the air does blow and it blows pretty cool.

You don't think that the 400 foot pounds of torque that the compressor is bolted to has enough power to drive a seizing compressor and make cold air? :roll:

by **Richie O** » Wed Sep 09, 2009 6:37 pm

Its like the ford escort we had a few years ago. Turn on the ac and it would slow down the car. ( actually not kiddin ) :shock:

My wife cured that though, hit a hillside, street sign, tree, trailer, then a car. :roll:

I left it out the window in front of the kitchen sink so she can look at it every day. :lol:

by **PToombs** » Wed Sep 09, 2009 7:04 pm

Man, you're just a mean SOB! :lol:

It probably slowed down because she could pedal fast enough.

by **Bad93Cummins** » Thu Sep 10, 2009 6:33 pm

YEa but if it was seizing it would have happened by now, i've had working a/c for awhile now sence its been converted over to R-134.

by **Bad93Cummins** » Mon Sep 14, 2009 4:30 pm

Truck idles at 700-750 without a/c and idles at about 500 with a/c.

by **Richie O** » Mon Sep 14, 2009 4:34 pm

Thats way to much of a difference. Turn off the truck and see if you can turn the center of the compressor by hand.

by **PToombs** » Mon Sep 14, 2009 6:08 pm

That's too low with or with out A/C. Should be about 800 or so. I'd have to check the manual to see exactly how it should be. Might be 750 or 800 in Drive with A/C on.

by **Bad93Cummins** » Mon Sep 14, 2009 7:43 pm

Well my dad was saying that its about right cause with to much rpm don't want the truck to try to run-away?

by **Richie O** » Tue Sep 15, 2009 4:26 pm

PToombs wrote:That's too low with or with out A/C. Should be about 800 or so. I'd have to check the manual to see exactly how it should be. Might be 750 or 800 in Drive with A/C on.

My 89 FSM says 700 rpm's with ac on for auto's. 750 for sticks.

by **Bad93Cummins** » Tue Sep 15, 2009 7:33 pm

Noticed today that with the truck in drive and without a/c it idles at 650rpm.

So I need to adjust the idle?

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