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Old 07-07-2014   #1
92whiteZ
 
Join Date: Sep 2013
Location: Los Angeles, CA
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Default A/C gauge readings

I thumbed through the Service Manual but didnt see what i was looking for.

What should the high & low side gauges read when the system is fully charged?

this is for a 1992 with a R12 system that is all original.

many thanks!
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Old 07-07-2014   #2
-=Jeff=-
 
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Default Re: A/C gauge readings

What is the Ambient Temperature outside? Humidity?

This should help
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Old 07-07-2014   #3
cvette98pacecar
 
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Default Re: A/C gauge readings

Keep in mind that your pressure is actually going to be a little higher than what the PT chart says unless you have a big box fan moving air across your condenser.
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Old 07-08-2014   #4
92whiteZ
 
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Default Re: A/C gauge readings

Thank you everyone and don't know how i missed that chart.

Temps tend to be high 70's/low 80's, humidity around 45-50%. will make note of higher temps without a fan blowing across the condenser.

as always this group is top notch and extremely helpful.

big thanks to all.
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Old 07-08-2014   #5
-=Jeff=-
 
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Default Re: A/C gauge readings

Also looking at the PT chart you can see why R134a will put a bigger drag on the motor than R12
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1990 Corvette ZR-1 #1051
Watson Headers (2" Primary) - 3" Magnaflow Bullet cats - LT4 Catback
Late Model IH - Plenum
Coilovers - 4.10s
Custom Interior
NCM Lifetime Member #978
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Old 07-08-2014   #6
Dynomite
 
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Default Re: A/C gauge readings

Excellent Information Jeff....thanks
Quote:
Originally Posted by -=Jeff=- View Post
What is the Ambient Temperature outside? Humidity?

This should help
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