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09-01-2018, 12:49 AM
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#1 |
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Registered User
Join Date: Aug 2012
Location: Grant NE
Posts: 78
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A/c not engaging
Ok. I’m trying to install my A/C from classic auto air. I checked the compressor wire and had power. Got it all hooked up and added Freon and It wouldn’t kick the compressor on. I then checked the wire and it didn’t have power. So I checked the a/c fuse and it was ok. So what else should I check
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09-01-2018, 09:34 AM
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#2 |
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Old member
Join Date: Jan 2002
Location: Liberty, & Garden City S.C. , U.S.
Posts: 19,945
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Re: A/c not engaging
On the inside the truck at the unit the micro switch that sends power to the compressor. I had to tweak mine in the 56 to make contact.
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1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs. |
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09-01-2018, 02:27 PM
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#3 | |
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20' Daredevil (Ret)
 
Join Date: May 2003
Location: Jefferson State
Posts: 13,731
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Re: A/c not engaging
Quote:
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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09-01-2018, 03:10 PM
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#4 |
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Registered User
Join Date: Oct 2011
Location: Victoria, B.C
Posts: 3,794
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Re: A/c not engaging
Yep....its up under the dash and if you reach way up behind the glovebox you should be able to find that little switch and activate the button on the end.
Without the a/c underdash vent linkage aligned and pushing on that button....your compressor (and clutch) won't click in and spin. worth checking. Coley
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....for some men, there is experience, skill and effort....for the others...there is visa and UPS LOL 1966 Chevy 1/2 ton (Florida- Red/white) 1972 Chevy 1/2 ton (California- Blue/white) 2005 Chevy Silverado HD2500/Duramax 2000 Dodge Ram 1500 |
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09-01-2018, 10:43 PM
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#5 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
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Re: A/c not engaging
You may have to use a jumper wire to engaug the compressor clutch until you get enough Freon in to build up pressure. The low pressure keeps the comp. from coming on when the pressure is low.
George |
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09-01-2018, 11:17 PM
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#6 |
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Registered User
Join Date: Oct 2016
Location: Dallas Texas
Posts: 3,235
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Re: A/c not engaging
Be careful jumping the compressor.
If you pulled a good vacuum on the system before releasing the refrigerant, there should be plenty of pressure to kick the compressor on. It's probably best to go and get support from ClassicAutoAir with respect to the setup and the issues.
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67 C10 fleet fuel injected '70 402, 700r4, 3.73 posi 07 335 sport turbo 6sp 94 Trans Am GT LT1 6sp posi -- sold after 22yrs 99 540 sport V8 6sp -- sold 73 240z L24 4sp -- given to friend 68 C10 step 350/350 3.73 open -- sold |
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