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AC Questions

This is a discussion on AC Questions within the General Help forums, part of the LSx Technical Help Section category; This is my first post since I just got my 1998 z28 yesterday. I noticed my AC is blowing a ...

  1. #1
    CrapMaster samson_420's Avatar
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    AC Questions

    This is my first post since I just got my 1998 z28 yesterday.

    I noticed my AC is blowing a bit worm(about 50 to 55 degrees). I believe it should be about 45 degrees. What are the specs for my z28? Hi side,low side pressure and capacity.

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    CrapMaster samson_420's Avatar
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    Bump. . . . . . . . .

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    Senior Member Chaos's Avatar
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    it differs depending on ambient temps, but A/C should be running around 25-30psi low side and 175-225 high side if fully charged. not sure on the capacity but it's on a sticker under the hood. I live in a hot climate too, mine is fully charged and it doesn't blow very cold when it's pretty hot out side unless I'm cruising on the highway with enough air blowing over the condensor. Our a/c systems pretty much suck compared to most late model cars I've noticed.
    2002 WS6 aka "Mr.Brownstone"


    My car is my heroin

  4. #4
    CrapMaster samson_420's Avatar
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    Thanks a lot for the info. I dumped a 12oz can straight in(no bullshit additives). It kicked my low side PSI from 25 or so to about 33. The high is sitting at about 225-250 now was at 220max. So I guess it is kind of high. But, when I unhooked my gauges I noticed the damn shrader valves still leaked a bit. So I might just replace them. And pull down with a vac, see if it holds.


    What temp does your air blow out of the vents right now?

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    Senior Member Chaos's Avatar
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    Not sure but its enough now that its not 100+ outside any more

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    CrapMaster samson_420's Avatar
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    I really wan't to compare my AC temp to someone elses Camaro. Anyone? Come on I know someone has a thermometer.

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    Senior Member greatwhiteZ28's Avatar
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    mine gets cold real quick, quicker then any of my cars.

    but how hard is it to add free on? to most cars in general? ( its for my saturn)

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    CrapMaster samson_420's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post

    but how hard is it to add free on? to most cars in general? ( its for my saturn)

    Pretty easy, that's why I dumped in one more can.

    But, what is the actual temp blowing out the vents?

  9. #9
    CrapMaster samson_420's Avatar
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    Come on someone check their vents. . . . . . . .

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    CrapMaster samson_420's Avatar
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    Don't just jump on this opportunity all at once. . . . . . . . . .

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    Impounded
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    You made a mess,you can't just dump coolant into the system.You want the low side down around 25-28psi with fan on high,controls set to normal ac position.There is alot more than just what the pressures are in the system that determines how cold it is at the vents.The 1st thing is are the control cables working properly.Is it closing the hot air door all the way?You realize the fbodies don't use a hot water shut off valve SO the heater core is ALWAYS hot with engine coolant running through it.If i were closer i'd slap you around just for thinkin about dumping coolant into a system without knowing WTH yer doing!

    When i bought my wifes 99TA the ac was warm....i checked the pressures.Some idiot had it WAY over filled,I dumped ALOT of coolant out until it was operating properly.Now its nice and cold BUT if it had a hot water shut off valve it would be much colder.I suggest you were probably had the proper amount of charge when you were at 25 psi,probably the air door needs adjustment AND honestly i don't think it will get much colder than what you had UNLESS you install a hot water shut off.


    by the way 30 degrees below ambient air out of the vents is considered very good.If you shut off the hot water flow to the core you will probably see 40.
    Last edited by Rivi; 10-07-2007 at 06:55 AM.

  12. #12
    CrapMaster samson_420's Avatar
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    Thanks for the info. My shrader valves need to be replaced, so I will recharge with exact specified ammount(1.5 lbs.).

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    Single Malt rbob93's Avatar
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    Jeeezus dude......why don't you take it to an AC shop & quit throwing money at it???

  14. #14
    CrapMaster samson_420's Avatar
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    Quote Originally Posted by rbob93 View Post
    Jeeezus dude......why don't you take it to an AC shop & quit throwing money at it???

    Eh, that's what I do. I don't prefer to get raped by shops. I rather mess it up myself.

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