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Old 06-12-2005, 07:49 PM
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a/c system

im not sure where to post this so i'll try here, i want to know if anyone can tell me where the low pressure cut off swith is for the a/c compressor on my 94 full size blazer.

the a/c worked last year and i checked all the fuses and they are good i pulled the plugs on the comp. and they are good but the compressor wont come on even in defrost mode so i want to jump out the switch to see if i,m low on freon. and any other suggestions would be aprieciated.

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Old 06-12-2005, 08:23 PM
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If it is similar to my 1994 Suburban, it will be located on the accumulator, which is on the passenger side, close to the fire wall. But a better way to check your pressure is to buy a cheap Interdynamics gauge at Walmart or your local parts store. They are about $20 and the hose can be used to interchange with the R134A can tap. Since R134A has safety designed into the ports, you can only attach the pressure/filler hose to the low pressure port (blue cap), which is also near the accumulator (see the picture below). Personally, I recommend you use the gauge since if the refrigerant is low, oil will not circulate while you run the compressor. Good luck, Ed.

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Old 06-12-2005, 08:55 PM
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thanks ed,

that looks exactly the same, so that should do it i actually checked that plug and had power to one side so if it is a ground type switch it sounds like that could be the problem
i have to pick up a can and hose anyway so i'll get a guage and check it this week. it figures that it craps out a week before i take a 1200 mi trip. thats just my luck
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Old 06-12-2005, 09:00 PM
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Fuse

Doc here,

If the Oil was low, and you tried to run it, Don't forget to check the Compressor Fuse...Chances are it blew from low oil pressure..

It Should be clipped to the compressor itself, with 3 wires going to it.It could also be taped along side the compressor harness.

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Old 06-12-2005, 09:07 PM
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thanks doc,

the only thing on the compressor are 2 two wire plugs and there was no power at either plug with a test light i didnt see any fuse so i'll have to climb up and see if i can see somthing in the harness
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Old 06-12-2005, 10:13 PM
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Clutch fuse

Doc here,

You have to have the A/C on to get power at the clutch fuse..

Simple easy test...start it up get some to switch it on and off..you SHOULD hear the Clutch engage..."Click!" if that's good the fuse is good..

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Old 06-12-2005, 10:22 PM
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the clutch wont enguage at all, i had the engine running and the a/c on while i was checking it so what ever it is (fuse or pressure switch) its killed all power to the compressor.
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Old 06-13-2005, 12:29 AM
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Hi Helrazr, The guys all sound right to me. The low pressure switch should have power to one side and the pressure in the accumulator closes the circuit so you will have power on the both sides when operating proper. I have never seen (that I can recall) an A/C system Blow a fuse. The Fan Motor will, they are usually on the same fuse. I'd be looking back at the controls that put the power to the switch. The low switch is a power through switch the high pressure if it has on is usually on the back of the compressor and it works the ground for the clutch magnet.
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Old 06-13-2005, 12:33 AM
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Helrazr, I forgot to mention I saw your pics of MAAC show. Really like pics of Falcon Sprints, My high school hellrazer. The Wild Thing build up pics and History were in last months Hemmings Muscle car magazine.
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Old 06-13-2005, 09:38 PM
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thaks everyone i was low on freon i jumped out the switch and the compressor came right on. i put one can in and it will short cycle so one more can tomorrow and i should be good to go



and snkbyt, i saw the article in hemmings on the falcon that car really is sweet and it relly rattles your teeth when its fired up...
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