Posted by jdemaris on July 23, 2008 at 07:04:02 from (72.171.0.141):
In Reply to: Re: auto a/c posted by Brian Jasper co. Ia on July 23, 2008 at 05:06:57:
Why would pulling the grille out make changing the orifice tube easier?
I put a new orifice tube, compressor, dryer and condensor in my 91 Suburban - and the orifice tube was in the line going to the evaporator on the firewall - nowhere near the front grille.
But - maybe his 92 truck is the new body style? I kind of lost track since GM mixed up the body styles late 80s and early 90s. My 91 Suburban is "old body style", and I know 1/2 trucks had "new body style" starting around 88. And - I have no idea if it makes any difference in the AC system.
When I fixed mine last summer- and retrofitted to 134A - it read 40 PSI on the low side and 250 PSI on the high side - on an 80 degree F day (humidity unknown). It worked fine then and still does - blows 48 F air at 80 F degrees air temps. On some real hot days I've seen the high side go to 300 PSI.
I do know the pressure readings in themselves can be misleading unless put into proper context - and often a thermocouple temp reading of discharge line is needed along with them.
Every GM I ever had - with a trashed compressor - had chronic orifice tube and screen plugging problems until I replaced the condensor - since it's near impossible to ever get it flushed out properly.
Seems some shops now put a filter on condensors - to stop the debris from travelling through the system.
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