Question about 2004 GMC Sierra 1500 Crew Cab

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On my 2004 gmc sierra z-71 it has the low and high side airconditioing port it looks like about 8 in apart on the same line u can put a recharge can and guage on the 1 closest to the firewall it reads 65-70 psi if you lower the 134a to what the guage says it should be it wont cool. works when charged to the 65-70 psi but my problem is while setting still it wont cool enough. I am looking into the cooling fan not working right.why is the ports on the same line?and why is the preasure not what the guage says it should be.had no problem charging my 96 tk right where the guage said it should be as my buick is also and a sunfirealso.thanks for any help

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There is a orifice in the line.On one side you will have high pressure.After the orifice you will have low pressure.Like having a garden hose with a small nozzel and putting the same size hose over the nozzel with the other end open.Not sure what the pressure is called for on that truck.May be higher pressure required.May want to try and find out what the required pressure is for your truck.

Posted on Aug 23, 2010

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