87 AC Problem
Junior User
Joined: Jun 2005
Posts: 71
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From: southern kentucky
the one next to the battery in the photo is the high side.
see the hose running from compressor and runs along the firewall near the windshield? that is the low side, and the line going to condenser from compressor is high side.
see the hose running from compressor and runs along the firewall near the windshield? that is the low side, and the line going to condenser from compressor is high side.
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Freshman User
Joined: Jul 2006
Posts: 39
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From: California Central Coast
I think its time to take it to the shop, I hooked the r-134 and gauge to the low side and after about 20 seconds of letting in r-134 the gauge read 75 psi. The system was empty before and the motor was running with A/C set to max. I dont know enough about A/c to troubleshoot this. Bad gauge?
Senior User
Joined: Feb 2004
Posts: 292
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From: Kansas City
Exactly right, when the compressor shuts of the system will equalize and the pressure on both sides will be about the same. I think 100ish, depends on the temp outside.. When the compressor kicks on it will suck on the low side, dropping the pressure, and kick the high side way up.
If it was empty, it might not come on til you get the second can in. Listen for the compressor to start kicking on. When it stops shutting back off, you know you are close.
From empty, it will probably start then stop immediately, every 30 to 60 seconds, and run longer and longer as you fill it.
If you turn the can upside down it will fill much faster. Leave it right side up when you get close to the right pressure so you can control it better though.
If it was empty, it might not come on til you get the second can in. Listen for the compressor to start kicking on. When it stops shutting back off, you know you are close.
From empty, it will probably start then stop immediately, every 30 to 60 seconds, and run longer and longer as you fill it.
If you turn the can upside down it will fill much faster. Leave it right side up when you get close to the right pressure so you can control it better though.
Last edited by clstrfbc; Aug 1, 2006 at 04:26 PM.
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Freshman User
Joined: Jul 2006
Posts: 39
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From: California Central Coast
Thanks I'll give it another shot, it just made me nervous that the pressure was so high, I didnt want anything to blow up. It doesnt tell you all this in the kit! Thanks again.
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Freshman User
Joined: Jul 2006
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From: California Central Coast
I dont mean to beat this simple procedure to death but I have just one more question. I just hooked up held a can of r-134 upside down for a solid thirty minutes while shaking and it feels like maybe a 1/4 can went in at the most (and thats being generous), this is with motor running and A/C set to max. Is it supposed to take this long? I am probably wrong but the system was previously empty and the guage reads 100 psi at the low side and I think that there is not enough pressure in the can to push the refrig. into the system. Could this be the case?...and is there a way to remedy this? Thanks.
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Joined: Feb 2004
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From: Kansas City
It should only take about 10 minutes to empty the can. The compressor still hasn't kicked on. Normally it would suck it right out for you. It should be kicking on and off by now.
Make sure the connector is plugged in, and the fuses and relays. It will also run in defrost position. You should have a relay, and poss a fusable link for the ac clutch in the engine relay box. There will also be a fuse on the inside panel I think.
Make sure the connector is plugged in, and the fuses and relays. It will also run in defrost position. You should have a relay, and poss a fusable link for the ac clutch in the engine relay box. There will also be a fuse on the inside panel I think.
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Freshman User
Joined: Jul 2006
Posts: 39
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From: California Central Coast
Yeah the compressor has not kicked on yet. There is a fuse in the inside panel, it is good. The connector is plugged in and in good condition. The fusable link looks okay, I will have to find the relay and look at that too. What if I turn the compressor on manually, will this help draw the refrig. out? Thanks -Ryan
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Freshman User
Joined: Jul 2006
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From: California Central Coast
Thanks for the help.
Hey thanks for all the help I have cold A/C. To jump start the compressor when the system was empty I hooked the 134 up and manually turned on the compressor for about thirty seconds and this got the whole process flowing. I dont know if that is bad for anything but it worked, the a/c is cold, the pressure is right, and i'm stoked. I guess I'll see how long it lasts. I could not see any leaks and I replaced the orings but theres probably a leak somewhere, time will tell. Thanks again.
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