Anybody close that knows A/C - The 1947 - Present Chevrolet & GMC Truck Message Board Network

red71cheyenne · 07-30-2010, 08:54 PM

I have the Oldair system installed and tried to charge it myself. The compressor keeps dragging though, so I think I have some air in the system. Anybody close that has the tools to evacuate and re-charge? I'd really like to learn to do this the RIGHT way myself. Thanks, Jeff.

red71cheyenne · 07-31-2010, 11:15 AM

Maybe have to jury-rig something. ttt

kevmic28 · 07-31-2010, 04:43 PM

Harbor freight sells a nice little vaccum system for pretty cheap. Might try that route before you jerry rig something.

JimKshortstep4x4 · 07-31-2010, 08:02 PM

I assume that Muskegon, MI is too far for you!

I don't understand your comment on the compressor "dragging". Can you elaborate?

Jim

red71cheyenne · 07-31-2010, 09:40 PM

The compressor was running, but would act like it got a restriction and would cause the belt to slip/drag. Made a horrible racket. I tried evacuating the system again, got it to 25 inches of Hg for an hour and then put about another pound of freon in it. Everything was ok for a bit, but then it started slipping/dragging again. With the pressure guage on it, the pressure would gradually rise until it was around 80-100 psi. When it wasn't dragging, the pressure was around 20-25.

I'm not sure what to think. I'm going to call Oldair Monday and see if they have any idea's. Seems to me I've got air or something, but like I say, I got a real good vacuum on it.

crushermechanic · 07-31-2010, 09:54 PM

the only reason the compressor will do that is a loose belt or the compressor is locking up. are you hooking your gauges on both sides of the system high and low. you should see about 200-225 an the high and 25-30 on the low.

red71cheyenne · 07-31-2010, 09:57 PM

I only have one guage for the low side, no high side. Would air in the system cause the compressor to lock up? I can't imagine anything being left in the system after the vacuum. Might the compressor just be bad? Why would it go back and forth? Belt is tight. I thought that might be it too, but I have it tight.

Ackattack · 08-01-2010, 04:03 PM

I'm going to borrow a buddies A/C tools sometime in the near future. I think it has 2 guages, so let me know if you don't get it figured out and maybe we can get both of our systems charged.

BTW, how much freon are you supposed to put into the system?

red71cheyenne · 08-01-2010, 08:29 PM

The instructions say 26-32 ounces. I'm only getting one can(12 oz) in when the compressor goes haywire. Richard H may be right, maybe I didn't get it down far enough to make sure all the moisture is out. I'm still going to call Oldair tomorrow to ask about the compressor tho. I'll update you as to what they say.

07-30-2010, 08:54 PM	#1
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Anybody close that knows A/C I have the Oldair system installed and tried to charge it myself. The compressor keeps dragging though, so I think I have some air in the system. Anybody close that has the tools to evacuate and re-charge? I'd really like to learn to do this the RIGHT way myself. Thanks, Jeff. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

07-31-2010, 11:15 AM	#2
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Anybody close that knows A/C Maybe have to jury-rig something. ttt __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

07-31-2010, 04:43 PM	#3
kevmic28 Registered User Join Date: Jun 2009 Location: Arlington Texas Posts: 602	Re: Anybody close that knows A/C Harbor freight sells a nice little vaccum system for pretty cheap. Might try that route before you jerry rig something. __________________ 1970 GMC truck 1988 Harley 1200 Sportster

07-31-2010, 08:02 PM	#4
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: Anybody close that knows A/C I assume that Muskegon, MI is too far for you! I don't understand your comment on the compressor "dragging". Can you elaborate? Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

07-31-2010, 09:40 PM	#5
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Anybody close that knows A/C The compressor was running, but would act like it got a restriction and would cause the belt to slip/drag. Made a horrible racket. I tried evacuating the system again, got it to 25 inches of Hg for an hour and then put about another pound of freon in it. Everything was ok for a bit, but then it started slipping/dragging again. With the pressure guage on it, the pressure would gradually rise until it was around 80-100 psi. When it wasn't dragging, the pressure was around 20-25. I'm not sure what to think. I'm going to call Oldair Monday and see if they have any idea's. Seems to me I've got air or something, but like I say, I got a real good vacuum on it. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

07-31-2010, 09:54 PM	#6
crushermechanic Registered User Join Date: Dec 2009 Location: Fort Walton Beach, Fl Posts: 361	Re: Anybody close that knows A/C the only reason the compressor will do that is a loose belt or the compressor is locking up. are you hooking your gauges on both sides of the system high and low. you should see about 200-225 an the high and 25-30 on the low.

07-31-2010, 09:57 PM	#7
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Anybody close that knows A/C I only have one guage for the low side, no high side. Would air in the system cause the compressor to lock up? I can't imagine anything being left in the system after the vacuum. Might the compressor just be bad? Why would it go back and forth? Belt is tight. I thought that might be it too, but I have it tight. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

08-01-2010, 04:03 PM	#8
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	Re: Anybody close that knows A/C I'm going to borrow a buddies A/C tools sometime in the near future. I think it has 2 guages, so let me know if you don't get it figured out and maybe we can get both of our systems charged. BTW, how much freon are you supposed to put into the system? __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

08-01-2010, 08:29 PM	#9
red71cheyenne Back in the sticks Join Date: Jan 2001 Location: Fordland, MO Posts: 3,188	Re: Anybody close that knows A/C The instructions say 26-32 ounces. I'm only getting one can(12 oz) in when the compressor goes haywire. Richard H may be right, maybe I didn't get it down far enough to make sure all the moisture is out. I'm still going to call Oldair tomorrow to ask about the compressor tho. I'll update you as to what they say. __________________ 1971 Cheyenne C-10 w/700R4 and Tuned Port Injection 1969 K5 Blazer w/Tuned Port 2010 2SS/RS Flaming Orange Camaro 2011 K1500 Suburban 2014 K1500 Pickup 2008 Nissan Altima? The wifes' hoopty

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