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Use R-12 Gauges with r134a and Vice-Versa?

wrenwright on Fri June 13, 2008 2:08 PM User is offlineView users profile

I have a couple of cars that still use R12 and a couple that use r134a. I'm looking to buy a gauge set, but have some confusion about what to purchase.

I've seen some conflicting information on whether it is OK to service both types of systems with one gauge set. I noticed that the Mastercool gauges list both types of refrigerants. If it is acceptable to use one set of gauges, do they typically come supplied with both types of fittings?

Any suggestions?

Thanks!

TRB on Fri June 13, 2008 3:23 PM User is offlineView users profile

Nothing wrong with a DIY individual using one set of gauges. Just be sure to purge the lines between usage.

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Edited: Fri June 13, 2008 at 3:24 PM by TRB

wrenwright on Fri June 13, 2008 3:31 PM User is offlineView users profile

Thanks, Tim.

As an aside, what does one use for a vacuum gauge when bringing down a system to see if it will hold vacuum? I have a standard automotive one that I use for carburetor setup. Is this what is needed, or?



mk378 on Fri June 13, 2008 3:50 PM User is offline

The low side gauge on a gauge manifold is also calibrated to measure vacuum. The needle doesn't stop at zero. It is called a compound gauge.

wrenwright on Fri June 13, 2008 3:53 PM User is offlineView users profile

Thanks!

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