Author Topic: 2002 Chevy AC issue  (Read 4551 times)

Offline VileZambonie

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Re: 2002 Chevy AC issue
« Reply #15 on: July 24, 2018, 05:53:43 PM »
A site glass is pretty much irrelevant when you have pressure gauges. It's for the I need to see it kinda guy.
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Offline Irish_Alley

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Re: 2002 Chevy AC issue
« Reply #16 on: July 26, 2018, 07:04:48 AM »
so i added 24+ oz of freon, the truck from what i can find online calls for 29oz. i added 2 12oz cans and part of another not sure how much but i imagine it was somewhere between 4-6. cant get the high side to go above 150 and the low side is around 50-60. the low side at idle is around 70 and the high is around 125 BUT idle is still low (around 500) give her some gas and thats when the high side goes to 150 and low starts dropping. temp somewhere between 75-80 which might be why i couldnt get it to reach 200. but the ac does blow cold now as long as youre moving but stopped or idle it warms right up and the low pressure hoses are cold now. so its back to the way it was before the high pressure switch blowing out

so i want to fix my low idle and im thinking it has to do with the fuel pressure, maybe the fuel pump. it has a hard time starting when cold. it has to rotate longer than it should to start and then it sounds like it has a miss. if you shut it off and restart it it runs fine. i just replaced the intake gasket for it leaking and swapped out the MAF with a known good one. havnt touched the fuel pressure reg. i did look at it as i was told a sign of a bad one would be that its leaking fuel and mine was dry, with code P0171, P0174
« Last Edit: July 26, 2018, 10:34:17 AM by Irish_Alley »
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Offline VileZambonie

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Re: 2002 Chevy AC issue
« Reply #17 on: July 26, 2018, 04:47:44 PM »
Sounds like the compressor is ready for retirement
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Offline VileZambonie

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Re: 2002 Chevy AC issue
« Reply #18 on: July 27, 2018, 05:24:32 AM »
Also here is the pressure chart for your truck. Keep it handy for when you do fix it

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74 GMC, 75 K5, 84 GMC, 85 K20, 86 k20, 79 K10