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Andy4639 · 09-26-2019, 08:19 PM

If the truck runs cool now I wouldn't worry about it. If it can sit in hot traffic and stay cool you should be fine. If it doesn't then you may need the extra cooling fan.
There are 2 things to remember about cooling.
#1 is the water temp needs to stay cool.
#2 the ac freon pressures have to stay low so the tempature does to!
Most clutch fans will do the job of both but if you have a thick 4 core radiator and a massive condenser then the clutch fan may not do the job. It has to pull enough air through them to keep them both cool to work properly.
The more you seal off around the radiator support and force the air through the radiator and condenser the better the cooling.
Another suggestion make sure the hot water valve is in place and working. It will drop the cab tempature by 5-10 degrees.

09-26-2019, 08:19 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Vintage Air install If the truck runs cool now I wouldn't worry about it. If it can sit in hot traffic and stay cool you should be fine. If it doesn't then you may need the extra cooling fan. There are 2 things to remember about cooling. #1 is the water temp needs to stay cool. #2 the ac freon pressures have to stay low so the tempature does to! Most clutch fans will do the job of both but if you have a thick 4 core radiator and a massive condenser then the clutch fan may not do the job. It has to pull enough air through them to keep them both cool to work properly. The more you seal off around the radiator support and force the air through the radiator and condenser the better the cooling. Another suggestion make sure the hot water valve is in place and working. It will drop the cab tempature by 5-10 degrees. __________________ 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.