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Old 04-07-2011, 03:19 PM
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89 chevytruck switching over to 134a just cycles

Yeah so working with what was at hand I'm trying to see if I can get this thing running with out redueing the complete system,hopeing to save some money!
Have know idea on condishion of said system. 134a switch over!
So no leaks holding a charge blowing cold air. cycle every 2-3 second lugs Down the engine when it does cycle!
I picked up a new pressure switch hoping this will be the quick fix! hope I dont have to replace the compressor!

Any help would be great thanks!

Craig

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Old 04-07-2011, 05:41 PM
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A.c.

If your system is undercharged it will cycle like that.Look for the sight glass,it`s probably on top of the receiver tank.It`s about 1/4" in diameter,if it has bubbles in it when the compressor`s running you`re under charged and needs freon added.With it blowing cold air it probably doesn`t need much. Hopefully there`s no air in the system.Was oil added when the system was charged?
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Old 04-07-2011, 05:44 PM
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Quote:
Originally Posted by ChevyTruckGuy
Yeah so working with what was at hand I'm trying to see if I can get this thing running with out redueing the complete system,hopeing to save some money!
Have know idea on condishion of said system. 134a switch over!
So no leaks holding a charge blowing cold air. cycle every 2-3 second lugs Down the engine when it does cycle!
I picked up a new pressure switch hoping this will be the quick fix! hope I dont have to replace the compressor!

Any help would be great thanks!

Craig
What are the system pressures? and at what daytime temperature are you working in. Also how much R 134 a did you put in.
Dont get carried away with the oil charge either. Answer please.
Dont look for a sight glass, your system is a GM CCOT and they have a accumulator not a reciever /dehydrator...so no sight glass.
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Old 04-08-2011, 12:05 AM
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Quote:
Originally Posted by latech
What are the system pressures? and at what daytime temperature are you working in. Also how much R 134 a did you put in.
Dont get carried away with the oil charge either. Answer please.
Dont look for a sight glass, your system is a GM CCOT and they have a accumulator not a reciever /dehydrator...so no sight glass.
Yeah this is a red neck operation 75-85 degree I have know gauges yet. I just added a 134a retro fit kit with the fill gauge! Got the right lines from the compressor to the condenser replaced one of the valves on the low pressure side service port but could not replace the high pressure side it has a bigger valve stem! I could not get it out but its not leaking so I left it a lone and cleaned the condenser! So I used a oil and 134a recharge kit to fill the system!

The lower line that runs from the condenser to the evaporator is cool has oil in it. Accumulator is room temp So that's where I'm at!
OH! Last the motor that's in the truck is a 350 out of what I think is a 94 truck so its not the stock compressor for 89! other than that everything is stock!

I can put up a picture if needed

Craig
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Old 04-08-2011, 07:37 AM
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The cycling indicates that you are still low on Freon. Add more.
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