slemnah
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Remove all the freon and put the system into a deep vacuum to check if there are any leaks. The system should be able to hold about 28-29" of vacuum for an extended period of time. That will tell you if you have a leak. Then jumper the low pressure switch and charge the system with the correct amount of freon. Once you know the system is working correctly reconnect the low pressure switch and see if the system operates. If it doesn't you have a bad switch. You also need to see what your high and low pressure readings are when the system is running. Low side should be around 30psi and high side will depend on ambient temperature. There are many pressure charts out there to help you with this.
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Seabass69
Texas
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i did. it held 24" of vac for a week. I then started to put freon in it so i had to use a jumper at the relay to make the compressor engage. i havent been able to find a low pressure switch....
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slemnah
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What pressures did you have on the high and low side? Which port did you use to charge the system, the low side or the high side?
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Seabass69
Texas
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only 20 or so on the low, about 170 on the high. charged thru the low...
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bfast54
Traverse City ,Mi.
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Sounds like a sticking....or bad Low pressure switch to me ..........must be some type of senser somewhere.....and did you mean 104 ounces.....or....10.4 oz.????
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Seabass69
Texas
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lol, no 104 oz. 2 lines 40' long so its going to hold a good bit of freon
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rvrepairnut
bc
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Seabass69 wrote:lol, no 104 oz. 2 lines 40' long so its going to hold a good bit of freon
104 oz = 6.5 lbs should be more than adaquite
when U directly run(jump) the compressor do u get proper AC cooling?
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dougrainer
Carrolton, Texas
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Seabass69 wrote:lol, no 104 oz. 2 lines 40' long so its going to hold a good bit of freon
BIGGEST MISCONCEPTION by non professionals. They assume since the lines run 40 foot it takes a LOT more coolant. IT DOES NOT. Like I stated, your system holds no more than 4 lbs usually about 3.5 lbs. Doug (yes, I am a professional). Once you OVERCHARGE a system, That has a high pressure switch, then the compressor will kick out from too high of pressure. Too MUCH coolant is as bad(actually worse) as too LITTLE coolant. Where is this relay you mention? Is it a Bosch or a metal relay? Have you replaced the dryer and the expansion valve? On a system as old as yours, that needs to be done as with no history since you purchased used and so far adding coolant does not get you there, you need to start out at the beginning. Doug
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slemnah
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On your pressures, what was the temperature outside when you were doing all of this? Was the fan running on the condensor? What was the temperature coming out of the vents inside on the dash?
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rgatijnet1
Florida
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The pressure that you are reading is the line pressure from the freon overcharged condition. In other words, "freon can" pressure. It is not the running pressure from your compressor. You need to start over and add freon and the proper amount of oil while watching your gauges. As mentioned, your compressor shut off due to an overcharge and the pressure in your system is similar to the air pressure in your tires.
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