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Old 07-20-2006, 09:41 PM
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A/c

I have a a/c problem when i turn my ac button on it dont work the clutch dont kick on when i tested the power on the compressor topend it had no juice but when i jumped a wire to it the clutch ran were is my problem it is in a 1993 gmc suburban 1500 4by4 5.7

mckenzie020504@yahoo.com

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Old 07-20-2006, 10:35 PM
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Might be a pressure switch in the system that won't let the compressor kick on if there's not enough refrigerant in it.
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Old 07-20-2006, 10:36 PM
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is it low on freon ? did you check the low pressure switch ? more or less ill bet you are low on freon check to see what your pressure is. if its full jump the low pressure switch to see if the compressor kicks on if it does then you have a bad low pressure switch. let us know what you find out
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Old 07-20-2006, 10:59 PM
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The low pressure clutch cycling switch used on those years (up untill 99 I think) failed often, causing exactly your issue. If the refrigerant level is up to par (yours hodls 2lbs, 0 oz) and is still not engaging the clutch, that switch is the first suspect.
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Old 07-21-2006, 07:07 AM
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ac

were do i find that at
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Old 07-21-2006, 07:09 AM
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ac

I know it is low now can i fill it with out it working i have the freon but i didnt know if i can fill without that clutch working
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Old 07-21-2006, 07:27 AM
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Yes if the system is low on freon, you can install more without the clutch working. Good luck.

Steve
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Old 07-21-2006, 07:45 AM
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another thing is you truck have R12 or 134A freon you cannot mix these 2 freons up. if it hasnt been retrofitted they make a kit for 45 dollars to do so
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Old 07-21-2006, 07:53 AM
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A/c

I bought that and retrofit and was going to put in the r 134 and it tells you to turn on the ac on high and fill the 134 but i stopped because the clutch was not kicking on
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Old 07-21-2006, 08:00 AM
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Quote:
i stopped because the clutch was not kicking on
How much or how many cans of freon did you put in? Was the system completely empty when you started?

Steve
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Old 07-21-2006, 08:32 AM
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Ac

I have not put any in yet it is fully drainedfrom freon
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Old 07-21-2006, 09:08 AM
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[QUOTE=sbchevfreak] If the refrigerant level is up to par (yours holds 2lbs, 0 oz)

You system holds 2.0 lbs of R12.... So you will need 80% of that charge for the R134a so charge it with 1lbs 6oz of R134a freon. You should have a deep vacuum suction on the system to remove any moisture. (this will also aid in installing the freon) I would not recommend a recharge without the deep vacuum. But if you must, it can be done. If you don't have the deep vacuum I would say start the engine, turn the A/C to max A/C, blower on high and then install the freon. If the system is functional the compressor will start when enough freon is installed to over ride the low pressure switch. Do not over charge the system unlike R12, the R134a freon blows warmer air if overcharged.

Steve
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Old 07-21-2006, 11:50 AM
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Ac

So i drained out the 12 it has none in there when you hit the shrader valves nothing so now i start the truck and put 134 in 1lb 6oz rite with the ac on full blast
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Old 07-21-2006, 12:22 PM
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Ummm, I wouldnt do that. You still need to get all of the R12 out. Theres still plenty in there, even though its not under pressure. You still have oil and residual R12 that needs to be removed first. Personally, I would at least replace the O-rings while its drained and then consider changing the accumulator/dryer (although I have re-used the existing one before with no problems)...some say it works, some swear itll fail. Nevertheless, at the very least, you need to pull a vacuum on it before attempting a re-charge. Hope this helps

P.S. The low pressure switch should be located on or around the accumulator/dryer and can be bypassed with a jumper, but be SURE not to force it to run dry.
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Old 07-21-2006, 12:34 PM
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I think you need help from someone more familiar with auto refrigeration. If there is a trade school in your area, you may go there and offer your vehicle as a project to the school as a lab project, if you can do without it for a day or 2, depending on what they find. If that doesn't work for you, get help from someone with the proper tools and knowledge. Already you have admitted in this site to discharging refrigerant into the atmosphere, a federally mandated no-no. You have more of a problem than a system that won't cycle. Your system has a leak and this needs to be looked for before putting more refrigerants into the atmosphere. If it is a small leak, the charge may hold for a while and the system may work until it leaks out again, then your right back where you started. If it's a larger leak, the refrigerant goes in and may work for a day or so then the system goes out again. You need to find someone with a vacuum pump and gauges, as a minimum, to get started here. The way you are trying to charge your system will leave not only moisture in your system, but also the wrong type of oil in your system, eventually causing premature failure of your compressor. Your clutch will not kick in without jumping the low pressure switch if you are below the low pressure setting in the switch, which you are. Get some help from someone that can help you hands-on with your problem so it gets done right and doesn't cost you more in the long run.
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