Can I use a parts store R-134a charge hose gauge without a refrigerant can attached to check system pressure, or will whatever charge there is escape?



Thanks,
Sixto
MB-less

I think it shoud work if you keep the end valve closed or put a full can on it. But youre only going to read one side.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

You can't really tell what's going on without monitoring the pressure on both sides. I am buried in work through Friday, but I will do my best to remember to look for the guage set that was in my dads shop. If it is usable I will send it to you. If you don't hear anything from me before Saturday afternoon, PM a reminder to me.

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2001 SLK 320 six speed manual
2014 Porsche Cayenne six speed manual

Annoy a Liberal, Read the Constitution

Gauges are not that expensive. I just bought a set for 401 and it was $59,69, $whatever. 30lbs refrigerant was $79 or so.

The gauges last but you might need new hoses in 15 years or so.

Need good surface temperature readings also. The temps are on the gauge dials for good reasons , subcool, superheat.

Is this for that dual unit in the van?

I just replaced the factory crimped hose on my old Ford truck. After 25 years or so they should all be suspect. $75 for most of the hose on the truck, cheap.