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Username Post: A/C gauges        (Topic#357412)
gchemist 
Senior Chevytalk Moderator
Posts: 24932
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-28-19 08:19 AM - Post#2771800    

Can anyone recommend a good set of gauges for A/C work? I get by on a set from Harbor Freight. However the number of peeps calling for charging is going up. Everyone needs A/C work sooner or later. Are digital gauges good? I like the newer style where you can connect to ports then open them. The new self sealing R134 cans are a PIA. The adapter is reverse piercing. Plus you need to find the sweet spot where it's actually open.
Tool Topia seems to have a nice range of gauges.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 




100 CHEVY 
Dedicated Member
Posts: 6499
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
07-28-19 09:37 AM - Post#2771806    
    In response to gchemist

I can't suggest a particular brand of gauges.I have 6 or 7 sets I use.
And,I don't use can taps.I buy refrigerant in 30 lb canisters at the supply house.It's cheaper by volume.
And,a set of scales wouldn't hurt either.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
gchemist 
Senior Chevytalk Moderator
Posts: 24932
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
07-28-19 12:56 PM - Post#2771818    
    In response to 100 CHEVY

What's a scale? I use a factory chart and pressure. Close enough people don't complain.

Are block aluminum gauges better than old brass style? I guess I could swap the gauges on the aluminum block.

How do you dispense from a 30 lb can?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
100 CHEVY 
Dedicated Member
Posts: 6499
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
07-28-19 05:07 PM - Post#2771837    
    In response to gchemist

I prefer the brass gauges myself.
I still have a set of gauges from my dad.
The center hose on the hose set is for outside connection to vacuum pump(and,can taps)or to the tap on the drum.
Vent the hose at the gauges to remove the air in the hose and then open the valve to the cars system to charge.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
junkman104 
Frequent Contributor
Posts: 1401
junkman104
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
07-28-19 05:51 PM - Post#2771844    
    In response to 100 CHEVY

I have a set of Robinair gauges that are getting close to 20years old now. The cheap ones are just that!



 
100 CHEVY 
Dedicated Member
Posts: 6499
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
07-28-19 06:54 PM - Post#2771853    
    In response to junkman104

I have my dad's that are over 20 years old and his Robinair vacuum pump.
The gauges are easily re-buildable too!
They are good tools.
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 
gchemist 
Senior Chevytalk Moderator
Posts: 24932
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
09-22-19 10:16 AM - Post#2776131    
    In response to 100 CHEVY

Okay, here's another question. One thing I've not seen addressed in hundreds of videos, temperatures. Though temperatures vary, some things should be identifiable. Large temp differences can identify a clogged condenser. I'm curious, what kind of temp readings should be across expansion valves or orifice tubes?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
100 CHEVY 
Dedicated Member
Posts: 6499
100 CHEVY
Loc: Helena,Missippi,U.S.A.
Reg: 12-09-04
09-22-19 03:32 PM - Post#2776176    
    In response to gchemist

That's hard to answer.
The temp reading will be different at different times during the cooling cycle.When you first turn the a/c on,the temp will be very cold at the expansion device.As the cabin temp cools down,the temp will be different as cabin temps change.
When the cabin is "cool"(and system is charged correctly)the inlet and outlet temps at the evaporator will be almost the same.
I'm sure one of my a/c books would explain this better,but this is the best I can do!
Mike.

"You gonna leave it like that?
http://www.picturetrail.com/100chevy


 




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