Automotive Air Conditioning Information Forum (Archives)

rugerm44 on Wed November 03, 2010 10:32 PM

Year: 1971
Make: chevy
Model: corvette
Engine Size: 350
Refrigerant Type: r134
Country of Origin: United States

I just insalled a vintage air sys on my 71 corvette.I have a set of snapon ac gauges and a master cool vaccum pump.The vaccum pump worked fine last time I used it.I hook it up an tighten all the fittings and open both low and high side valves.Cant seem to get any kind of vaccum going.I let it run for 10 minutes no vaccum on the low side gauge.I dont think I have any leaks in the connections.Is there soemthing Im missing here.The hose quick couplers appear to be opening the valves on the service ports on the car when I tighten them down.It just dosent make any sense.I have used this set up before without any problems.I rechecked all my connections to make sure they were tight.I even tooked one of the caps off the manifold on the pump and it sucks my finger into the fitting so Im assuming the pump is working.I just drained an refilled the vaccum pump with fresh oil.I hate to pay someone to service it beacuse I have all the equipment to do the job.

TRB on Thu November 04, 2010 10:41 AM

If you don't have issues with your gauge set and vacuum pump. Might consider adding some refrigerant and doing a leak test. A leak this large should be pretty easy to find.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

Edited: Thu November 04, 2010 at 5:32 PM by TRB

Karl on Thu November 04, 2010 5:28 PM

Hook vaccum pump up to blue hose and low side valve closed .Then see if you can pull a vaccum to the manifold gauge set, that will tell you if pump is working. If it does, then yes it sounds like you have a BIG leak somewhere.